Action Replay DSi cartridge

Action Replay DSi cartridge, a popular accessory for Nintendo handhelds.
​About the Action Replay DSi
​Type: A third-party cheat and utility device (often called a "cheat cartridge").
​Purpose: It is used to load cheat codes into Nintendo DS, DS Lite, and DSi games, granting players advantages like infinite health, infinite money, unlocking all items, walking through walls, and more.
​How it Works: The device acts as a middleman between the console and the game cartridge. You typically insert the Action Replay into the DS system, and then insert the actual game cartridge into the slot on top of the Action Replay. It boots to a menu where you select the game and the cheats you want to activate.
​Compatibility: This version, the DSi model (with the yellow label), is particularly sought after because it is compatible with later DSi-enhanced games, such as Pokémon Black and White, which the older, original DS Action Replay models could not handle without an update.