Shin Megami Tensei - Persona 4 - Cheats

Successfully complete the game to unlock New Game + mode with a cleared saved game file. In this mode, Death sometimes hides inside treasure chests. You will know when this happens if you are prompted to open or ignore the chest. If you defeat Death after the chest is opened, you will get the ultimate weapons for the characters.

Successfully complete the game with the true ending. Start a game in New Game + mode. A new Fusion section will be available, allowing you to fuse Izanagi-no-Okami.

Fuse a persona during the fusion forecast "Skill Change". Effects = 1/2 HP gone from enemies. Light.

Fuse a persona during the fusion forecast "Skill Change". Effects = 1/2 HP gone from enemies. Dark.

In New Game + a new fusion section becomes available allowing you to fuse Izanagi-no-Okami.

After reaching 19 Social Links, visit the Velvet Room and Margaret will award you the Metal Bat.

Beat the game once to unlock New Game + mode.

By returning to completed dungeons, you can find the characters' secret weapons. Note: No secret weapon available for Chie. Note+: Main Character's secret weapon can be obtained early without fighting the extra boss by re-entering Void Ques before the boss appears.

Kanji's Secret Weapon - Defeat the extra boss in Steamy Bath House.
Kuma's Secret Weapon - Defeat the extra boss in Opera House.
Main Character's Secret Weapon - Defeat the extra boss in Void Quest.
Naoto's Secret Weapon - Defeat the extra boss in Secret Lab.
Yousuke's Secret Weapon - Found in the boss's den in Mysterious Shopping Street.
Yukiko's Secret Weapon - Defeat the extra boss in Yukiko's Castle.

Go to Magatsu Inaba in 2nd playthrough and open the regular treasure chests there (not the golden ones) , easier to find in Magatsu Inaba.

In a New Game +, you will sometimes be given the option whether you want to open treasure chests or not. This choice means Death lurks within. Choose to open the chest and defeat Death and he'll drop an Ultimate Weapon for each character.