I Wanna Be the Guy: The Movie: The Game (IWBTG) is a 2D platform indie freeware video game created by Michael "Kayin" O'Reilly for Microsoft Windows using Multimedia Fusion 2. First released on October 5, 2007, the game is not in active development despite being listed as a beta, though the game's source code was released by Kayin many years later. IWBTG is mostly known for its unusually difficult platforming elements, unorthodox level design, and its utilization of sound effects, characters and music from many other games.
The player controls "The Kid". The controls are limited to left/right movement, jumping, double-jumping and shooting. IWBTG is made up of several stages split into many screens, which are mostly pastiches of Nintendo Entertainment System games, such as Tetris, Ghosts 'n Goblins, The Legend of Zelda, Castlevania, Mega Man, and Metroid. At the end of each stage, a boss must be defeated to progress. The first seven bosses (Mike Tyson; Mecha Birdo; Dracula; Kraidgief (a parody of palette-hacked character glitches); Mother Brain; Bowser, Wart, and Dr. Wily in the Koopa Klown Kar; and a mix between the Mecha Dragon from Mega Man 2 and the Yellow Devil from Mega Man and Mega Man 3) are adapted from classic games, mostly platformers, but their behavior and appearance have been modified and enhanced for IWBTG. The final boss, The Kid's father, is unique to IWBTG. The game parodies many 8-bit and 16-bit era video games, such as the frequent use of references and sound effects from the Nintendo game Mario Paint.
IWBTG is most famous for its difficulty. Most of the landscape is engineered specifically to kill the player character.