Action Replay

An Action Replay is a cheating device that is used to hack into the Nintendo DS or Nintendo DSi's system to cheat. In the case of, it can make every item available and cause the player to have maximum Bells. This results in the game beginning to glitch. Action Replays also can create items (such as seeds) and can seriously damage the DS systems if used in a certain way. It is also often used for the Villager Modifier.

Also, the Action Replay does not work on DSi's due to Nintendo increasing the security on it. The creators of the Action Replay later released the Action Replay DSi allowing people to cheat using a DSi. In for the GameCube, it is possible to obtain Mario Bros., Ice Climber, Super Mario Bros., and The Legend of Zelda, but Mario Bros. and Ice Climber are also obtainable through e-reader cards.

Animal Crossing (GCN)
Using an Action Replay on Animal Crossing GameCube, it is possible to give yourself certain items (such as the snowman set) or modify the bug/fish log to say you have caught everything available. You can also grow and shrink, using the C control stick, and jump using the Z button, which can be used to get onto the train track, jump into the river and get to the island.

thumb|300px|right|A video showing various Action Replay codes for the GameCube.

Animal Crossing Wild World
Wild World is capable of many Action Replay codes. Built into the Action Replay are codes that give you an infinate supply of any item (not inluding 'not used' items by default), infinate bells, reduce your mortgage by huge amounts, remove weeds and so on. There are also programs, such as AnimalMap, which can create powerful codes to change acres in your town, spawn items on the world map, duplicate buildings and give you 'seeds' - buildings that are held in your inventory, which make buildings when dropped. Jumping is not possible, as Wild World has no Z axis for players and animals.

Animal Crossing City Folk
City Folk has next no Action Replay codes, but uses game saves instead. Game saves can be installed using Action Replay for Wii, but more people use the Homebrew Channel.