Michael Khanh Artiaga (born November 20, 2007), known online as dogplayingtetris or simply Dog, is an American Tetris player from Texas. He is best known for three victories, including 2 back-to-back titles, in the 2020, 2021, and 2026 Classic Tetris World Championship (CTWC), the first of which constituted the Guinness World Record for the "Youngest Tetris World Champion" at 13 years old.

From a young age, Michael and his brother Andrew Artiaga experimented in coding, computing, and gaming, alongside their father, a web developer. Practicing Tetris occasionally on their Game Boy, both brothers were inspired to pursue the game further after seeing 16-year-old Joseph Saelee's victory against the 37-year-old reigning champion Jonas Neubauer in the 2018 CTWC, marking the beginning of a new generation of Tetris players to the competitive scene. After his victories in the 2020 and 2021 CTWC, Artiaga continued to compete in Tetris tournaments, and additionally founded his own tournament series titled "Classic Tetris Brawl" (CTB).

On October 6, 2024, playing on a modified version of the game, Artiaga became the first player to achieve a "rebirth" of NES Tetris after successfully clearing the highest level of the game, level 255, triggering the game to restart back on level 0. In the same event, Artiaga also broke the game's high score record at 29.4 million points.

Michael Khanh Artiaga was born on November 20, 2007, to Van and Randall Artiaga and is from Fort Worth, Texas. He and his brother Andrew Artiaga grew up around electronics, as their father was a web developer. At 5 years old he learned basic coding, and further experimented in computing and gaming in elementary school. He and his brother practiced the skills they learned by creating characters and music for several of his father's gaming apps. In an interview with The Guardian, Michael stated his school work took precedence over his gaming, and that math was his favorite subject. Outside of Tetris, Artiaga also practiced speedrunning in other retro games including Super Mario Bros.

Artiaga was introduced to Tetris at 8 years old in elementary school, after playing it on the original Game Boy at home. He collaborated with his brother on their shortcomings while they practiced the game to better their playing. He was originally attracted to the game's need for quick-thinking, speed, and skill. Michael and Andrew, at 10 and 13 years old, respectively, began to play more intently after watching 16-year-old Joseph Saelee's victory against the 37-year-old reigning champion Jonas Neubauer in the 2018 Classic Tetris World Championship (CTWC), marking the beginning of a new generation of Tetris players playing the game.

After purchasing twin famiclones, Artiaga began to compete in tournaments under the name "dogplayingtetris" or simply "Dog", in reference to his avatar being a dog holding a Nintendo controller, while his brother took the nickname "P1xelAndy". In November 2019, Artiaga created his own Tetris tournament called "Classic Tetris Brawl" (CTB), which is made up of a number of events including three-player matches, level 0 to 19 speedruns, and a quarterly "Brawl Championship". In December 2019, he became the youngest person to complete a "maxout", a point in the game where the score becomes so high it no longer registers correctly on-screen.

"The key to success is watching how others play and learning what it is that makes them better than you."

During the COVID-19 lockdowns in the United States, both brothers began to practice more often while also learning from their competitors on Twitch. At 13 and 15, respectively, both Michael and Andrew qualified for the 2020 CTWC; Michael scored 1 million points in six games, making him the top seed in his double-elimination playoffs group. Michael was the second-youngest competitor there and the youngest to make it to the top eight. After beating fellow competitor Jacob Huff (known online as "Huffulufugus"), Michael made it to the final round with his brother Andrew, where they competed against each other at home due to COVID-19 restrictions. Michael won shortly after reaching level 29, winning $3,000, which he used to buy a real Nintendo Entertainment System (NES), a Donner guitar, an electronic drum set, and invested in cryptocurrency. Andrew celebrated the victory with Michael, giving him a high five immediately after the match; Michael remarked that the "great [thing] about being in the top two is that we both get great trophies". At 13 years and 16 days old, Artiaga set a Guinness World Record as the "Youngest Tetris World Champion".