Petri Purho (born 1983 in Kouvola, Finland^[1]) is a Finnish game developer and a cofounder of the game studio Nolla Games.^[2] He has previously also worked at Finnish independent video game developer studio Frozenbyte.^[3] He is best-known for the roguelite Noita and the puzzler Crayon Physics Deluxe, which won the Seumas McNally Grand Prize at the Independent Games Festival in 2008.

Purho initially made a name for himself as a rapid game prototyper. Almost all of his early games were created within one week as a massive prototyping project. Most common element of these prototypes are various bonuses for successful combos and/or chain reactions. These games were mainly created using open-source technologies.

Crayon Physics was Purho's tenth rapid game prototype and was coded in five days.^[4] It is a slow-paced puzzle game based on rigid bodies physics.

Noita, a rogue-like platformer developed by Nolla games (of which Puhro is a member), was released for windows 10 on Steam, GoG, Itch and Humble on October 15, 2020. It currently sits at a 76% on Metacritic and an 8/10 on Edge. ^[5]