CheatCodes.com has all the official Onimusha 3: Demon Siege PS2 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 Wednesday June 19, 2013 for Onimusha 3: Demon Siege are shown below. We also have this game on PlayStation 2, PC, and sometimes tricks from other game systems will also work on PlayStation 2.
Successfully complete the game on Hard Mode. Start a new game, press pause while playing and quickly press L1, L2, R1, R2, Circle Square (2), Triangle, Circle. You will regain full health.
Go to any warp mirror, pick an item, store it and exit the store/warp screen but don't warp. The number of the item that you have will now be duplicated.
Complete normal training mode once and unlock it after finishing the game.
Finish the game once on any difficulty.
Get all Haori for Ako.
Collect the 3 key items from just the Phantom Realms at Underwater Temple and Mont St. Michel.
Complete the shooting mini game.
Complete Issen mode once.
Complete game on hard mode once.
Complete the game on normal mode once.
'Game Over' twice in normal mode, and easy mode will be unlocked.
Simply beat 'Normal Mode' once.
Have an Onimusha Buraiden saved file in your memory card.
Complete the secret training mode.
In the third dark realm at the very end there are ultimate weapons for Jaques and Samonosuke, at the end of Jaques's is the Oni Musou or Ultimate Whip, at the end of Samonosuke's is the sword of swords the Bishamon Sword.
To unlock open all of the blue line puzzle boxes in the game (15 in all) on any difficulty.
Increase all seven vests of Ako to the maximum to view the alternate ending sequence. This requires all eco spirits to be found.
To get all the swords from the original Onimusha, you must go trough all the dark realms with Samonosuke and Jaques, and you need to aqquire the fire seal, the wind seal, and the raizen seal, then beat the game. You get the swords at the beggining of the next new game you start regardless of difficulty.
Successfully complete the game on the normal difficulty setting to unlock Oni shooting Mini-Game
Succesfully complete the Oni shooting mini-game to unlock Ultimate Mode. The game will start out with Sam having the Bishamon sword; Jacq have his best Oni Musuo; infinite arrows, bullets, infinite Oni power, thirty Medicines, and ten talismans.
Intentionally lose the game twice on normal difficulty to unlock easy difficulty.
Found some tricks that we don't have? Got some helpful hints, tips, or tactics we don't know about? Tell us and you could win a free PlayStation 2 game (or any other game you want for any video game system)!