Action Replay

From The DS Ultimate Wiki

An Action Replay device is a game enhancer piece of hardware for a games console, and one that allows the use of a variety of codes for effects not originally intended by the creators of the game. It's a legal device, unlike certain alternatives, and the Action Replay DS one has become one of the most popular types among DS Ultimate forum members, with hundreds hacking codes for it in the Super Mario 64 DS Action Replay Codes forum.

Popular Codes to have

Popular and requested codes at DS Ultimate include object replacement, character editing, 'fun' type codes and codes for 100% completion.