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, Kirby, Mega Man and Metroid.
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These are 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.
Family Guy | Buddy Guy | Guy's Hospital | Guy de Maupassant | Guy Ritchie | Guy Maddin | Guy Clark | Larry the Cable Guy | Guy Debord | Guy | Guy Sebastian | Guy Carleton, 1st Baron Dorchester | Guy Verhofstadt | Guy Gavriel Kay | Guy Fawkes | The Fall Guy | Guy Fletcher | Guy Chambers | Guy Sigsworth | Guy Mitchell | Guy Lombardo | Guy Pearce | Guy Gibson | Guy Evans | I Wanna Be Sedated | Guy Kibbee | Guy Fawkes Night | Guy Carleton | Barry Guy | That Guy with the Glasses |