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Toby Fox
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Toby Fox
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Robert F. "Toby" Fox (born October 11, 1991) is an American video game developer, composer, and voice actor. He is best known for developing the role-playing video games Undertale and Deltarune — both of which received critical acclaim. Undertale has received nominations for a British Academy Game Award, three Game Awards and D.I.C.E. Awards.

Key Information

Fox's early work consisted of developing RPG Maker games and creating ROM hacks like the EarthBound Halloween Hack. Fox then moved on to composing music, most notably for Andrew Hussie's 2009 webcomic Homestuck.

Following the success of Undertale, he went on to compose music for a number of other indie games, as well contributing to the soundtracks of Super Smash Bros. Ultimate and the Pokémon video games.

Early life and education

[edit]

Robert F. Fox[1][2] was born on October 11, 1991,[3] in Manchester, New Hampshire.[1] Along with his three brothers, he is the son of Robert Fox, a financial planner, and Barbara Fox, a retired paraprofessional.[clarification needed] Fox was raised as an Episcopalian.[1] Fox has stated that as a child, he took music lessons, including piano and trumpet; when he reached middle school, he decided to start playing piano again, performing gaming soundtracks by ear.[4] He later studied environmental science at Northeastern University and graduated in 2014.[1]

Career

[edit]

2008–2009: Early work

[edit]

Fox's earliest experiences in game development involved using RPG Maker 2000 with his three brothers to make role-playing games and creating ROM hacks in high school.[5][6] His most notable early project was the EarthBound Halloween Hack,[7][8] a Halloween-themed ROM hack of EarthBound, which released in 2008. He then moved on to compose a variety of music for Andrew Hussie's 2009 webcomic Homestuck during his senior year of high school. Though he did not initially respond when Hussie started a Music Contribution Team in April 2009 and put up a news post asking composers to participate, Hussie took note of his work when Fox started uploading piano covers of the webcomic's music on the MS Paint Adventures forums.[9][4]

Fox was production coordinator of Homestuck's soundtrack until its conclusion in 2016, composing music including a version of "Megalovania"; he credited this with giving him experience with digital audio workstation software.[9][10][4] Additionally, he has stated in a tribute post to musician George Buzinkai that tracks such as the unused Homestuck theme called "Patient" inspired Undertale themes such as "Another Medium". In particular, his remix of Buzinkai's song Doctor, titled "Savior of the Waking World", was a "turning point" in his musical journey; it was used as the background music for a major moment in the fifth act of Homestuck.[11]

2013–2015: Undertale

[edit]
Main article: Undertale
Close-up of the face sprite of Undertale's "Annoying Dog", an author surrogate of Fox

Fox's most well-known work is the 2015 role-playing video game Undertale, which he also composed the soundtrack for.[1] The game sold more than 3.5 million copies,[12] becoming a "breakout hit" and "pop-culture phenomenon".[13] The game has received nominations for a British Academy Game Award, three Game Awards and D.I.C.E. Awards.[14][15][16] Fox worked on the entire game independently, besides the art assets—which he asked Temmie (Tuyoki) Chang to help with—to avoid relying on others.[17] He thought of the character designs and ideas for Undertale while in college, where he drew them in his notebook.[18]

Following its release, Undertale garnered an extensive fanbase.[19][20] Fox commented that he did not mind if people stated that they did not like the game, saying that it was "not for everyone".[20] Despite Undertale's awards and widespread acclaim, in 2016, Fox wrote that his personal opinion was that the game was still "niche" and deserved an "8/10" review score.[19][21]

In 2016, Fox released a number of unused musical tracks from Undertale.[22] He also became a contributor to the A Profound Waste of Time magazine.[23] Fox was then chosen to be part of the 2018 Games Forbes 30 Under 30 list for his role in creating Undertale; by then the game had sold over 2 million copies.[24]

The success of Undertale, especially in Japan, afforded Fox the opportunity to visit Super Smash Bros. creator Masahiro Sakurai at his home, where they discussed the series and played Super Smash Bros. Ultimate against each other, and the two reportedly had a very similar skill level, trading wins and losses equally. Sans, a character from Undertale, was later included in Super Smash Bros. Ultimate as a Mii costume available through downloadable content, along with an instrumental composition "Megalovania", for which Fox provided a new arrangement.[25][26][27]

2018–present: Deltarune

[edit]
Main article: Deltarune
The logo for Deltarune

On October 30, 2018, Fox tweeted a request for fans of Undertale to check the game's official Twitter account in 24 hours. The following day, Fox released the first chapter of the followup to Undertale, named Deltarune for free under the guise of a "survey".[28][29] On November 1, Fox shared more details regarding the game, including that the rest of the chapters were expected to release simultaneously, but work had not yet started, and there was no estimated timeframe for completion.[30]

Fox also stated that he had been working on the project since 2012, and that the idea for Undertale developed from Deltarune during production.[30][31] On June 12, 2019, as only the first chapter of Deltarune had been playable for several months, Fox expressed on his Twitter account he had hope he would complete the rest of Deltarune, saying: "Slowly I'm writing and drawing it all out."[32] He stated that he had written "about 50 songs past Chapter 1".[33]

On September 17, 2021, Fox released the second chapter of Deltarune for free since "the world has been really tough for everybody recently", referring to the struggles of the COVID-19 pandemic. He released the next two chapters, bundled in with the first two, as a paid game on June 4, 2025;[34][35][36][37] future chapters will be added to the game as free updates for owners of the paid version.[38] He is currently working on Chapter 5,[39] which is set to release in 2026.[40]

2017–present: Composing

[edit]

Fox has composed music for the 2017 Homestuck video game Hiveswap,[41] Undertale artist Temmie Chang's short narrative game Escaped Chasm,[42] and Game Freak's 2019 RPG Little Town Hero, the last of which was arranged by Pokémon composer Hitomi Sato.[41] He also composed a track for Pokémon Sword and Shield,[41] a vocal song for Itoki Hana's Pray album,[43] and multiple tracks for Pokémon Scarlet and Violet.[44][45] He also remixed Ed Sheeran's "Celestial" for Scarlet and Violet's expansion The Indigo Disk.[46]

In 2024, he partnered with Japanese game developer ZUN for the game Touhou Danmaku Kagura Phantasia Lost, which included a track that combined the Touhou song "U.N - Owen Was Her?" with the Undyne battle theme "Battle Against a True Hero" from Undertale as "U.N. - Owen Was Hero?".[47] In September of the same year, he announced a new partnership for the same game on YouTube. The video contains a very brief preview of the song, which appears to be based on "Megalovania".[48]

Influences

[edit]

Fox has described himself as being mesmerised by the music and atmosphere of Final Fantasy VI. Other Japanese role-playing games, such as EarthBound, Secret of Mana and Super Mario RPG served as major inspirations; Fox looked up to Yoko Shimomura's works in particular. Her song "Megalomania" for the game Live A Live was particularly inspiring for Fox, and he originally intended to use an EarthBound-themed cover of the song in a game, but he got tired of transcribing it and eventually made a new song called "Megalovania."[49]

Fox discovered the Touhou Project series at a very young age, and has been playing "since [he] was five years old."[50] During middle school, he downloaded the demo versions of Embodiment of Scarlet Devil and Perfect Cherry Blossom. He played a piano rendition of the Perfect Cherry Blossom track "Necrofantasia" at his church's summer camp.[51]

Personal life

[edit]

Fox is secretive and does not typically do interviews.[1][52] He has chronic wrist and hand pain that regularly disables him from programming and composing, and often relies on speech-to-text software as his computer input method. In September 2020, Fox cited a flare-up of this pain as a factor in the delayed development of Deltarune's second chapter.[4][53]

Works

[edit]

Video games

[edit]
Year Title Director Composer Writer Platforms Ref.
2008 EarthBound: Halloween Hack Yes Yes Yes Super Nintendo (ROM hack) [8]
2015 Undertale Yes Yes Yes Windows, macOS, Linux, PlayStation 4, PlayStation Vita, Nintendo Switch, Xbox One [1]
2016 Rose of Winter No Yes No Windows [54]
2017 Hiveswap: Act 1 No Yes No Windows, macOS, Linux [41]
2018 Deltarune Chapter 1 Yes Yes Yes Windows, macOS, PlayStation 4, Nintendo Switch, PlayStation 5, Nintendo Switch 2 [28][55]
2019 Escaped Chasm No Yes No Windows [56]
Little Town Hero No Yes No Windows, PlayStation 4, Nintendo Switch, Xbox One [41]
2020 Dweller's Empty Path No Yes No Windows [57]
Hiveswap: Act 2 No Yes No Windows, macOS, Linux [41]
2021 Deltarune Chapter 2 Yes Yes Yes Windows, macOS, PlayStation 4, Nintendo Switch, PlayStation 5, Nintendo Switch 2 [28][55]
2022 Pokémon Scarlet and Violet No Yes No Nintendo Switch [58]
2025 Deltarune Chapters 3+4 Yes Yes Yes Windows, macOS, PlayStation 4, Nintendo Switch, PlayStation 5, Nintendo Switch 2 [28][55]
Off (remaster) No Yes No Windows, Nintendo Switch [59]

Future games

[edit]
Year Title Director Composer Writer Platforms Ref.
2026 Deltarune Chapter 5 Yes Yes Yes Windows, macOS, PlayStation 4, Nintendo Switch, PlayStation 5, Nintendo Switch 2 [60][61][62]
TBA
 Deltarune Chapter 6 Yes Yes Yes [63][61][62]
Deltarune Chapter 7 Yes Yes Yes

Guest composer only

[edit]

Other credits

[edit]
Year Media type Media title Role Notes Ref.
2009–2016 Webcomic Homestuck Composer [72]
2010 Album The Baby is You Writer, composer, vocalist Album made for Homestuck [72]
2012 Album I Miss You - EarthBound 2012 Composer [73]
2012 Website tane.us Guest arrangement Metronomy - Black Eye Burnt Thumb (Toby "Radiation" Fox CHIP MIX) [74]
2018 Album Pray Guest composer, lyricist and vocalist [43]
Video game Black Bird Game testing [75]
2020 Comic Hobonichi Mother Project "Pollyanna" comic Contributor [76]
Music video Chip Tanaka/Hammerhead Shark Song Director/animator (music video) [77]
2021 Video game Get in the Car, Loser! Credited for providing guest items and stories [78]
Song "Myths You Forgot" Featured artist In collaboration with Camellia [79]
2022 Song "Skies Forever Blue" Composer, writer In collaboration with Itoki Hana [80]
Commercial Pocari Sweat Composer In collaboration with PUNPEE and imase [81][82][‡ 1]
2023 Song "The Greatest Living Show" Composer, writer In collaboration with Itoki Hana [83][84]
Song "Prelude" Composer In collaboration with bo en [85]
Animated television series We Baby Bears Voice actor (2 episodes) [86]
Downloadable content Pokémon Scarlet and Violet: The Hidden Treasure of Area Zero Composer Remix of Ed Sheeran's "Celestial" [46]
2024 Song "Fallen Wing" Composer As a guest composer for Hololive VTuber Amane Kanata's Unknown DIVA album, with Camellia [87]
Song "Dead Ma'am's Chest" Composer In collaboration with Hololive VTuber Houshou Marine and Camellia [88]
2025 Web series Homestuck: The Animated Pilot Composer, Executive Producer, voice actor (John Egbert) Credited as Toby "Radiation" Fox [89]

References

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Toby Fox

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Toby Fox (born Robert F. Fox on October 11, 1991, in ) is an American indie , , and voice actor best known for creating the critically acclaimed game Undertale in 2015. Raised in with three brothers, Fox developed an early interest in video games and music, taking lessons as a child and experimenting with during his youth. He gained initial recognition in the online creative community as "Radiation Fox," contributing music to the Homestuck starting in 2009, where he co-founded the project's music team and composed tracks like "," which later became iconic in his own games. Fox's breakthrough came with Undertale, a solo-developed RPG that subverted traditional genre mechanics through its narrative choices, humor, and emotional depth, selling over a million copies shortly after release and earning widespread praise for its innovative storytelling and soundtrack. In 2018, he launched , a released episodically, with chapters 1 and 2 available for free and chapters 3 and 4 released on June 5, 2025, with further chapters in development. Beyond games, Fox has composed for other projects, including tracks for (2019) and (2022), as well as voice acting in his own titles.

Early life

Upbringing

Robert F. "Toby" Fox was born on October 11, 1991, in . He is the son of Robert Fox, a , and Barbara Fox, a retired , and grew up with three brothers in the family home. As a child, Fox developed an early interest in music, learning to play by ear starting in his freshman year of high school and participating in his school band on the . These experiences laid the foundation for his compositional skills, which he later applied to soundtracks. Fox was immersed in video games from a young age, often playing and discussing them with his brothers, which ignited his passion for game design and narrative storytelling. The siblings frequently sketched game levels and concepts together, such as imagined stages for Mega Man X, fostering a collaborative creative environment that emphasized humor and adventure. This early exposure transitioned into more structured pursuits during his formal education, where he began experimenting with game creation tools.

Education and early interests

Fox was born and raised in , where he attended local during his early education. He developed an early passion for video games and while in high school, becoming self-taught in music composition and experimenting with game modding as personal hobbies. These interests began with creating amateur ROM hacks for games like , which he shared in fan communities under the alias "." In 2010, Fox enrolled at in , , pursuing a degree in . He earned a in the field in 2014, maintaining a focus on his academic studies amid his growing creative pursuits. During his university years, Fox continued to balance his coursework with self-taught hobbies in game and music composition, using tools like and composing tracks inspired by soundtracks. These activities remained extracurricular, allowing him to refine his skills outside formal training.

Professional career

Early projects

Toby Fox's earliest notable project was the EarthBound Halloween Hack, a ROM hack of the 1994 game , which he developed and released in October 2008 at the age of 16 under the username "" for the fan site's annual Halloween Funfest.[] (https://starmen.net/vote/vote.php?id=23586) The hack features an original story centered on a named Varik navigating a spooky, horror-themed version of the game's world, complete with altered maps, new enemies, and Fox's custom music tracks composed using the sound font, including early versions of motifs that would later appear in his professional work.[] (https://wikibound.info/wiki/EarthBound_hacks_and_fangames) This project showcased Fox's budding skills in , , and music integration, earning community recognition within the fanbase despite its juvenile humor and mature content warnings.[] (https://www.hardcoregaming101.net/earthbound-the-halloween-hack/) In 2009, Fox began contributing original music to the Homestuck by , marking his entry into collaborative composition for multimedia projects.[] (https://homestuck.net/music/references.html) His early tracks, such as "Doctor" (a looping theme featured in Act 4 flash animations) and "Umbral Ultimatum" (used for character entry sequences in later acts), were chiptune-inspired pieces that blended electronic and orchestral elements to fit the comic's evolving narrative.[] (https://hsmusic.wiki/artist/toby-fox/) These compositions, released across the first volumes of the official Homestuck soundtrack starting in August 2009, helped establish Fox's reputation in the 's music team, where he produced over a dozen tracks by 2011 using self-composed files.[] (https://homestuck.bandcamp.com/album/homestuck-vol-1) Beyond these, Fox participated in various amateur endeavors from 2005 to 2012, including fan games and modifications shared on forums like Starmen.net, where he frequently posted under "" to experiment with tools such as 2000 for simple role-playing prototypes and software for music creation.[] (https://www.pcgamer.com/the-making-of-undertale/) He collaborated informally with his siblings on untranslated projects, honing mechanics like turn-based combat, and contributed minor assets to community mods, all while building proficiency in and basic scripting without formal training.[] (https://en.wikiversity.org/wiki/Digital_Media_Concepts/Toby_Fox) These efforts, often inspired by 's whimsical style, were disseminated through fan communities to refine his technical abilities in and audio production.[] (https://armageddonsmilesclub.medium.com/evolution-of-a-song-toby-foxs-megalovania-18a7b1d30521)

Undertale

Undertale's development began in January 2013 as a solo project by Toby Fox, who handled programming, writing, music, and much of the art using GameMaker: Studio. Inspired by his earlier ROM hacks and experiments with battle systems, Fox created an initial demo in May 2013 to test core ideas, which was shared with select outlets like Fangamer. To fund further work, Fox launched a Kickstarter campaign on June 25, 2013, seeking $5,000 but ultimately raising $51,124 from 2,398 backers, enabling hires for additional art by contributors like Temmie Chang while keeping the project primarily under Fox's control. The game evolved over 32 months into a role-playing game set in an underground world of monsters, where the player controls a fallen human child navigating encounters through dialogue, puzzles, and combat. Undertale was released on September 15, 2015, for Microsoft Windows and macOS, priced at $9.99, with a version following in July 2016. Its core mechanics blend turn-based RPG elements with dodging, where players maneuver a heart-shaped to avoid enemy attacks during battles, but emphasize non-violent resolutions through a moral choice system that tracks actions like sparing or fighting monsters. This system influences multiple endings—pacifist (fully non-violent), neutral, and genocide (total extermination)—with consequences rippling across playthroughs, such as altered dialogues or inaccessible content, encouraging replayability and ethical reflection without mandating violence. By November 2025, Undertale had sold over 7.3 million units across platforms, generating approximately $50 million in revenue, establishing it as a landmark indie title. Fox composed the entire original soundtrack, featuring chiptune-inspired tracks that integrate seamlessly with the narrative, such as the intense "" during a key boss fight and the whimsical "Bonetrousle" for skeletal encounters. The OST, released alongside the game, enhances emotional beats and humor, with leitmotifs recurring to tie story elements together. Critics praised for its innovative meta-narrative that subverts RPG tropes, heartfelt character development, and blend of quirky humor with poignant themes of mercy and friendship, earning a 92/100 score and ranking among the highest-rated . Reviews highlighted its ability to deliver laughs through absurd scenarios—like befriending a fish warrior or a flower —while innovating player agency in a compact 6-10 hour experience. Post-release, received ports to and on August 15, 2017, followed by on September 18, 2018, with adaptations for controller inputs and minor quality-of-life tweaks like adjustable battle speeds. These expansions broadened accessibility, including physical editions via . For the 10th anniversary in September 2025, Fox hosted a livestream showcasing a modified build with teaser areas, new scenes, and music snippets—such as an expanded section and Snowdin updates—hinting at connections to his later works without altering the core game.

Deltarune

is an episodic developed by Toby Fox as a follow-up to , set in a parallel universe with returning themes of and but expanded narrative scope. Announced and released for free on October 31, 2018, Chapter 1 introduces players to the town of Hometown and the Dark World, where protagonist teams up with classmates Susie and Ralsei to confront antagonistic forces while exploring light and dark realms that blend everyday life with fantastical adventure. The chapter builds on Undertale's bullet-hell combat and pacifist options but emphasizes ensemble dynamics and environmental puzzles in its roughly three-hour runtime. Chapter 2 followed as a free update on September 17, 2021, for PC and Mac, continuing the story in a cyber-themed Dark World and deepening character relationships, particularly between and Susie, while introducing recruiting mechanics for defeated enemies. Development paused briefly after this release to expand the team, allowing Fox to collaborate with additional artists, animators, and programmers such as Temmie Chang and Sarah O'Donnell for more complex visuals and mechanics in subsequent chapters. This team-based approach marked a shift from Fox's solo work on , enabling richer world-building across light and dark domains. Chapters 3 and 4 were released on June 5, 2025 (June 4 in some time zones), as part of a paid bundle priced at $24.99, available on PC, Mac, , , , and Nintendo Switch 2. These chapters advance the overarching plot involving the Roaring and character arcs for returning figures like Susie, while incorporating television-inspired and festival-themed Dark Worlds that heighten emotional stakes and humor. Chapter 5 is planned for release in the second half of 2026, with future chapters intended as free updates to the bundle. The early free chapters drew massive player engagement upon release, while the 2025 bundle achieved commercial success with over 2 million units sold across platforms and peak concurrent players exceeding 130,000 on alone. Critically, has been praised for its innovative storytelling that balances whimsy and dread, memorable ensemble cast, and evocative music, earning scores around 90% from outlets highlighting its evolution beyond Undertale's foundations.

Composing contributions

Toby Fox's composing career began with contributions to the webcomic , where he created tracks such as "" and others that showcased his early melodic style. Fox composed the complete soundtrack for in 2015, consisting of over 100 tracks that blend elements with and rock influences to evoke emotional depth and narrative tension. He extended this approach to , producing full soundtracks for Chapter 1 (2018, 25 tracks), Chapter 2 (2021, 37 tracks), and Chapters 3 and 4 (2025, 78 tracks combined), incorporating leitmotifs that recur across chapters for thematic continuity. Beyond his own projects, Fox collaborated on the soundtracks for Acts 1 (2017) and 2 (2020), the prequel, contributing original tracks alongside James Roach to capture the game's adventurous and quirky tone. In 2022, he composed field music concepts for , which Game Freak expanded into multiple variations for the open-world exploration. Fox also arranged a remix of his signature track "Megalovania" for in 2018, tailored for the fighter's dynamic gameplay. In 2024, Fox partnered with Touhou Project creator ZUN for their second collaboration, arranging each other's tracks for the rhythm game Touhou Danmaku Kagura Phantasia Lost. He further contributed to indie titles, including combat themes for the 2025 remaster of Off. Fox primarily uses FL Studio for his compositions, beginning with keyboard sketches of melodies and chords before layering synths and effects. By 2025, his credits encompass more than 20 projects across games and media.

Influences

Video game inspirations

Toby Fox has frequently cited (1994) as a foundational influence on his philosophy, particularly its blend of quirky humor, eccentric characters, and everyday small-town settings that ground fantastical elements in relatable scenarios. The game's unconventional approach to RPG storytelling, emphasizing personal connections and whimsical narratives over tropes, resonated deeply with Fox during his formative years and shaped his preference for subverting genre expectations. Another key inspiration came from (1994), which Fox identified as his first traditional JRPG experience. He has stated that he was completely absorbed by its music and atmosphere. Fox's exposure to the Touhou Project series, a franchise, profoundly impacted his integration of dodging mechanics into RPG combat systems. As a fan since middle school, he drew from its dense, pattern-based enemy attacks to create dynamic, avoidance-focused battles that blend tension with strategy, transforming passive turn-based fights into active, skill-testing encounters. The SNES-era modding culture, particularly around EarthBound, further inspired Fox's early creative output, leading him to create his own ROM hack, EarthBound Halloween Hack (2008), as an experimental extension of beloved mechanics. Shin Megami Tensei series influenced the ACT and MERCY commands in Undertale, as Fox enjoyed the concept of talking to monsters in the games. The Mario & Luigi series also served as a general inspiration. During the final stages of Undertale's development, Fox listened repeatedly to "To Far Away Times" from Chrono Trigger (1995), which evoked nostalgia and reflection.

Musical influences

Toby Fox developed his composing skills primarily through self-directed practice on the piano, where he learned by transcribing video game melodies by ear, rather than formal instruction. This approach instilled classical influences through piano fundamentals while fostering an affinity for chiptune aesthetics drawn from 8-bit Nintendo games like those in the Mother series. A key influence on Fox's rock and jazz elements stems from composers like , whose work in and other titles shaped his dynamic scoring. Specifically, Shimomura's "MEGALOMANIA" from inspired the structure and emotional intensity of Fox's "MEGALOVANIA" in , with Fox noting at age 15 that he initially wanted to reuse the track before creating his own variation to evoke a similar boss-battle climax. Similarly, ZUN's soundtracks, blending rock riffs and jazz improvisation, have profoundly impacted Fox since middle school, leading him to emulate ZUN's style in tracks like "Let’s Read a ~ You’re Welcome" for . Fox's contributions to the further refined his multimedia , where he composed over a dozen tracks that integrated eclectic elements, bridging roots with experimental layering. This experience highlighted broader genres like electronic and folk, evident in Undertale's soundtrack, which mixes synthesized beats with acoustic-inspired motifs to create an immersive, genre-blending palette.

Personal life

Health challenges

Toby Fox has suffered from chronic wrist and hand pain since early in his career, attributed to repetitive strain from extensive game development and music composition work. This condition first became publicly documented in a 2020 development update, where he described a severe flare-up that prevented him from playing the piano, using a , , or typing for prolonged periods. To manage the pain and continue his creative process, Fox relies heavily on speech-to-text software, which he used extensively during the worst episodes to navigate tasks and write. In a 2025 , he confirmed that his issues, though somewhat improved, still limit extended typing, stating that he uses voice-to-text "for everything." He has also employed adaptive tools like mice and foot pedals to reduce strain, but these accommodations highlight the ongoing physical toll of his solo-intensive workflow. The pain has significantly impacted Fox's productivity, particularly during the development of , where flare-ups halted progress on writing, composing, and programming. In a 2024 newsletter, he explained that wrist issues can make essential tasks impossible, likening the frustration to having one's artistic aspirations "slipping away." This led to the expansion of his development team for later chapters, as working alone became unsustainable due to both time demands and his physical condition; Fox noted it "would not be possible to make or release by myself." As of 2025, Fox has not shared public details on a formal diagnosis or specific treatments, though he has mentioned the pain's persistence in interviews and updates.

Public persona and privacy

Toby Fox has cultivated a deliberate low public profile throughout his career, prioritizing anonymity and minimal personal exposure in an industry often characterized by high visibility for creators. He rarely grants formal interviews, with only a handful documented on his official website, including discussions with collaborators like Temmie Chang and Kikiyama. Instead, Fox communicates updates and insights primarily through periodic newsletters hosted on toby.fangamer.com and brief posts on his Twitter account (@tobyfox), where he shares game development progress and fan-directed messages without revealing personal details. Fox consistently avoids public appearances at conventions and refrains from sharing personal photographs, a practice that has led many outlets to respect his boundaries by not publishing images of him. In game credits, he frequently employs pseudonyms or avatar representations, such as his early online handle "," to further obscure his identity. Despite this reclusiveness, Fox has lent his voice to select roles in his projects, including character sounds and lines for figures like the Annoying Dog in , though he has never participated in live events or voice work tied to public performances. Interactions with fans remain strictly limited to asynchronous channels like game patches and newsletters, ensuring controlled engagement without direct contact. His emphasis on seclusion is compounded by ongoing health challenges that further reduce opportunities for public visibility.

Works and recognition

Developed video games

Toby Fox's first notable project as a developer was the EarthBound Halloween Hack, a free ROM hack of the Super Nintendo Entertainment System game EarthBound, released in 2008 under the pseudonym "Radiation". The hack reimagines the original story with horror-themed elements, taking place on Halloween night, and features custom music composed by Fox, including early versions of tracks that would later appear in his other works. Distributed freely within ROM hacking communities, it gained a cult following for its innovative storytelling and atmospheric changes but remained a non-commercial endeavor. Fox's breakthrough as a lead developer came with , an indie role-playing game he created, programmed, wrote, and composed single-handedly, released on September 15, 2015, for Windows and macOS via platforms like . The game emphasizes player choice, pacifist mechanics, and meta-narrative elements in an underground world populated by monsters. Ports followed for on July 17, 2016; and on September 15, 2017; on September 18, 2018; on March 16, 2021; and mobile devices in subsequent years. By 2025, Undertale had sold over 7.3 million units worldwide, generating approximately $50 million in gross revenue, establishing it as one of the most successful indie titles of the decade. In 2018, Fox began developing , a spiritual successor to with shared thematic and musical elements, serving as lead developer for its episodic structure. Chapter 1 was released for free on October 31, 2018, for Windows and macOS, followed by Chapter 2 on September 17, 2021, also free, with ports to and for both by 2021. The early chapters amassed over 1 million downloads within weeks of their respective launches, driven by high concurrent player peaks exceeding 100,000 on for Chapter 1 alone. Chapters 3 and 4 were released as part of a paid compilation on June 5, 2025, for PC, Mac, , , , and Xbox Series X/S, priced at $24.99, with future chapters planned as free updates. The full release through Chapters 4 has sold over 2.4 million units by late 2025. As of November 2025, Fox has confirmed Chapter 5 is in development and slated for release in the second half of 2026, with no other developer-led projects announced.

Composing and other credits

Toby Fox began his composing career contributing music to the webcomic , where he created over 20 tracks between 2009 and 2016, including notable pieces like "Doctor" and "". These compositions appeared across various official soundtrack albums released by What Pumpkin Studios, blending elements with thematic motifs tied to the comic's narrative. His work on established his reputation in indie music circles, with tracks such as "Skaian Skuffle" and "Penumbra Phantasm" becoming fan favorites for their energetic and atmospheric qualities. In 2017, Fox served as a composer for Hiveswap, a Homestuck-themed developed by What Pumpkin, contributing original tracks to both Act 1 and Act 2 soundtracks alongside James Roach and others. His pieces, such as those featured in the Act 2 OST, incorporated retro synth sounds to evoke the game's alien worlds. The project includes Acts 1 (2017) and 2 (2019), along with related media like Hiveswap Friendsim (2019–2020), to which Fox provided select musical contributions. Act 3 remains in development as of 2025. Fox arranged the remix of his signature track "" for in 2018, marking his first major collaboration with a mainstream title. This high-energy arrangement was composed specifically for the game's soundtrack and became available as DLC, retaining the original's intense piano riff while adapting it to the fighter's orchestral style. The track's inclusion highlighted Fox's growing influence beyond indie projects. For the 2022 release of , Fox composed several tracks for the base game, with additional contributions to the 2023 DLC The Hidden Treasure of Area Zero. His work included field themes like "Route 1" and "Casseroya Lake," as well as battle motifs such as "Tera Raid Battles," which he detailed in his official ; these pieces featured melodic layers inspired by exploration and conflict, arranged by Game Freak's team from his initial concepts. DLC-specific tracks encompassed "The Blueberry Academy," "The Indigo Disk," and "Terapagos," blending his signature whimsy with Pokémon's adventurous tone. In 2022, Fox collaborated with singer Itoki Hana on the single "Skies Forever Blue", composing the music and writing the lyrics, with Itoki Hana providing vocals, vocal arrangement, and base MIDI arrangement. Additional contributions included live instrument arrangements by Carlos Eiene and guitar/bass by Jules Conroy. The music video and illustrations were produced by OMOCAT, LLC. In 2024, he collaborated with creator on Touhou Danmaku Kagura Phantasia Lost, arranging "U.N. Owen Was Her?" and contributing to mashups like "Necrolovania," which fused motifs from both artists' repertoires; a second collaboration followed later that year. Fox has also lent composing or special thanks credits to miscellaneous indie titles, such as Mr. Saitou (2023, additional music) and Get in the Car, Loser! (2021, guest contributions).

Awards and cultural impact

Toby Fox's work on garnered significant recognition in major industry awards. The received a for Game of the Year at , highlighting its innovative storytelling and gameplay among top titles of the year. Undertale was also nominated for the Story category at the 2016 BAFTA Games Awards, acknowledging its narrative depth and emotional resonance. Additionally, it earned nominations for Outstanding Achievement in Game Direction and Role-Playing of the Year at the 2016 , celebrating Fox's direction as a solo developer. Fox's follow-up project, Chapter 1, released in 2018, further solidified his influence in indie gaming, though it did not secure major nominations at the time. The series has since inspired widespread cultural phenomena, including memes centered on characters like Sans and from , which have permeated internet humor and communities due to their quirky personalities and memorable designs. Fox pioneered accessible indie RPGs emphasizing choice-driven narratives that subvert traditional combat mechanics, encouraging pacifist playstyles and moral decision-making, which influenced subsequent titles in the genre by prioritizing emotional player agency over rote progression. This legacy extends to vibrant fan ecosystems, with and spawning extensive covers of Fox's chiptune-inspired soundtracks, communities that expand game worlds, and creative fan works reinterpreting its themes of and . In 2025, Chapters 3 and 4 received widespread praise upon their June release, with reviewers lauding the chapters' creative boss battles, vulnerable character arcs like Susie's, and innovative presentation elements such as in climactic sequences. Earlier that September, during 's 10th anniversary livestream, Fox revealed unused content including numerous non-player characters and assets, sparking renewed fan imagination and discussions about potential expansions while emphasizing that "the only limit to all this is your imagination."

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