CheatCodes.com has all the official Minna de Puyo Puyo GBA cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Saturday May 18, 2013 for Minna de Puyo Puyo are shown below.
Defeat Carbunkle and successfully complete the Extra Course level to unlock him in Double Puyo Pop.
Defeat Satan in the G. Dark Prince Castle level to unlock Satan in Double Puyo Pop.
Signs let you gain access to new areas in Hitori de. The WELCOME SIGN lets you into Hajimari Forest; you start with it. The MERCHANT SIGN lets you into Goldtown; win from Seriri in Hajimari Forest. The WARRIOR SIGN lets you into Gachinko Dungeon; win from Nohoho in Goldtown The CONJURER SIGN lets you into Magical Tower; win from Draco Centaur in Gachinko Dungeon. The MONARCH SIGN lets you into G. Dark Prince Castle; win from Witch in Magical Tower. The last sign is the hardest to get. Defeat Satan-sama twice to get the DUBIOUS BOOK. Defeat Witch in magical Tower with the BOOK to get FLAME EXPANDER. Defeat Draco Centaur in Gachinko Dungeon with FLAME to get NOHOHO RUCKSACK. Defeat Nohoho in Goldtown with the RUCKSACK and get SCALE PENDANT. Defeat Seriri in Hajimari Forest with the PENDANT and she'll give you the GODDESS SIGN, which lets you into Trial Labyrinth, the 6th and final area.
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