Code Entry
To enter cheat codes, you first need to insert the "Kirby &the Amazing Mirror" game cartridge needs into the slot of the Action Replay. The Action Replay will automatically bring up the code menu when the Game Boy Advance is turned on. Select "Enter New Cheat" from the top of the code menu. Before you can use any other cheats for a game, you must enter its master code. The master code for "Kirby &the Amazing Mirror" is 156e6b51-38ef9b07-ad5bac98-df7b47e1.
Health Cheats
You can use three different health codes in "Kirby &the Amazing Mirror." The maximum health cheat starts the player with a maximum health bar without having to collect Extra Vital items. The code for maximum health is 56fa986f-63a76fcf. The infinite health cheat prevents the game from subtracting health when Kirby is hit. He will still react to any hits, but his health will not decrease. The code for infinite health is 204aaa47-ab715c33. The invincibility cheat renders Kirby invincible in the same manner the Candy item temporarily does. Kirby will not take damage or react to hits. The code for invincibility is 780f91e4-972fa220.
Infinite Supplies
"Kirby &the Amazing Mirror" has two additional Action Replay codes to make his supplies infinite. The infinite life cheat will prevent Kirby from losing a life any time he dies. The code to gain infinite lives is 3a7aad07-1c0137f1. The final cheat gives Kirby infinite batteries for his cell phone. Kirby can use the cell phone to return to the Hub to select a new level or to call for help. The code for infinite batteries is 1a4632fb-be8a7506.