Mazes and Mutants is a tabletop role-playing game played by the Turtles.
Mazes & Mutants - The copy the Turtles have was first owned by a kid named Martin Milton. But when Martin was feeding sparrows on a rooftop, a mutagen canister fell from the sky and hit him in the head, knocking him unconscious along with the birds he was feeding. He then turned into a sparrow mutant named Sir Malachi. When he was playing the game down in the sewers, he saw the Turtles pass by. He hid the box hoping they would find it, and when they did they loved the game, which let Malachi psychically create a real-life version of it, with the Turtles trapped in the game.
- The game itself is a reference to the role-playing game "Dungeons & Dragons", a game featuring trolls, demons and other fantasy monsters as enemies, first published in 1974 and having since inspired films, books and an animated series.