A few (7 to be exact) years ago, I was playing around with a buffer-overflow in Pokémon Red for Game Boy (the game was released 1996). The overflow occurs when two Game Boys are connected using a link-cable, intended to trade Pokémon between players. In this post I want to talk about how I abused this overflow to “install programs” into a Pokémon game, which survive restarts and can be run and used during game-play.