Sunset Overdrive is a 2014 action-adventure video game developed by Insomniac Games and published by Microsoft Studios. The game is set in 2027, in a fictional metropolis called Sunset City. The player controls an employee of FizzCo, who has to fight off the OD, short for Overcharge Drinkers: humans who have turned into mutants after drinking FizzCo's energy drink beverage. In the dystopian Sunset City, the player character can wall-run, use zip-lines, and grind rails to swiftly navigate through it, with a large arsenal of weapons to use. The game also has a cooperative multiplayer mode called Chaos Squad, which tasks players to complete a series of missions with seven players. As the game puts emphasis on momentum, the game does not feature any cover system.

The development of Sunset Overdrive began in 2011 when Insomniac completed Resistance 3. After the project was green-lit internally, the studio partnered with Microsoft Studios, which helped fund the game and allowed Insomniac to keep the rights to the franchise. Insomniac described the game as a "celebration of games", as the team took inspiration from different sources, including Prince of Persia, Jet Set Radio and Tony Hawk's Pro Skater, though at its early stage of development the team took inspirations from DayZ instead. The game is set in a post-apocalyptic future, but the team depicted it as an "awesomepocalypse" that turns the game's initial world depiction into a "playground" for players. The game uses Insomniac's internal engine, previously used in Fuse.

Sunset Overdrive was announced at E3 2013, and released worldwide for Xbox One in October 2014. A Windows version, developed by Blind Squirrel Games, was released in November 2018. The game received generally positive reviews from critics, who praised its visuals, traversal system, combat system, and humor. However, the game was criticized for the lack of a compelling story or innovative quest design. It sold about 1.9 million units, barely generating any profit for Insomniac Games. It received numerous nominations, including Best Xbox Game of the Year awards from several gaming publications. The game was supported with multiple pieces of downloadable content, including the story-based The Mystery of the Mooil Rig and Dawn of the Rise of the Fallen Machine, after the game's release.

Sunset Overdrive is an action-adventure game set in a third-person perspective. Players navigate a metropolis called Sunset City in the year 2027. This dystopian world has been overrun by mutants called the OD, short for Overcharge Drinkers. The player character is a former FizzCo employee, tasked with cleaning up the mess left behind from a party FizzCo had thrown to celebrate the launch of its new energy drink, Overcharge Delirium XT.

At the start of the game, players can customize the protagonist's sex, body type, hairstyle, and outfit using the character creator. Players may also alter the look of their customized character at any point during the game by approaching a vendor named Callista. After creating their characters, players proceed to the game's open world, which is free for players to explore at any time. A fast travel system is provided allowing players to reach different locations and to navigate the world quickly. The game features a main campaign with story elements and side-missions, which are triggered automatically when players enter certain locations in the city. These quests mainly involve players delivering objects to other non-playable characters and collecting items from the world. Some of these quests have time limits.

The game's combat focuses on velocity, and encourages players to defeat enemies in a fast-paced way. As a result, players can employ different moves including wall running, air-dashing, zip lining, performing parkour, acrobatics, and water traversal. Players use grind rails to deftly navigate city streets, and are able to switch direction instantly at will. The city is also filled with items for players to bounce up into the air. Players may utilize their weapons while performing these movements and slow down time for players to take aim. On-foot, players cannot walk, take cover, or take out enemies silently, but instead must rely on agility to survive as they will be overwhelmed quickly by enemies if they choose to walk on the ground. The game also features a Style Meter. Shown in the head-up display (HUD) of the game, the Meter increases as players perform stylish moves like killing enemies and grinding on-rails without touching the ground. When players are killed, they do not have to wait for the game to load. Players can respawn and return to the world by different methods, such as descending with a rocket or exiting a golden sarcophagus. Insomniac named this system "Next-Gen Respawning".

Throughout the game, players encounter both human enemies, such as gang members, FizzCo's robots, OD'd humans who have mutated from drinking too much of the energy drink, and several bosses who are more difficult to defeat compared with other ordinary enemies. The game features a variety of weapons for players to use to combat enemies. These include the standard assault rifle AK-FU and the TNTeddy grenade launcher, which fires teddy bears strapped to sticks of dynamite, fireworks and toy helicopters. All weapons eventually run out of ammunition but do not need to be reloaded while being used. Different weapons are effective against different enemies, and players unlock more weapons by progressing through the story or purchasing them from shops. Weapons can be upgraded and modified by applying "Amps", which increases weapons' lethality, efficiency, and strength, though some amps are only activated when the player reached a certain style level. The weapons can be leveled up when players earn enough experience points or defeat enough enemies with them. In addition, players gained different badges throughout the game for completing actions such as grinding and killing enemies. These badges can be used to purchased Overdrives which grant players additional passive skills such as increasing the damage or ammo capacity of a certain type of weapon.

The game features an eight-player co-operative multiplayer mode called the Chaos Squad, which tasks players to complete a series of missions, as decided by the players themselves. Players defend vats of Overcharge Delirium XT from waves of OD'd at night and stop their progression by setting up fortifications and barriers, in a manner similar to tower defense games. It is inter-connected with the single-player mode allowing players to transfer their story character, with all the weapons and gadgets they have already accumulated, to the mode. Although players work together, players also try to earn more Style points during play than their co-op partners.