Complete the game while achieving the following requirement will unlock mini games. You can select the mini games from the menu once you unlock them.

Unlock extra difficulties by completing the following requirements.

To unlock the three maxed weapons from Onimusha 1, complete the game once while achieving the following requirements. And you should start a new game with the three secret weapons which will be found at the same street where Samanosuke first transfer into the future. Remember, you still need to finish the game after you meet the requirements. At the end, you will unlock them. And you can use them from the next new game and on.

There are certain titles that can be attained for exceptional performance during the game. These titles will appear under the grade you earn.

Complete the game and this new mode will open up, enabling you to play as Heihachi.

Before your last encounter with Nobunaga, go to the save point at the bottom of the stairs to the temple. Look to your upper left. The crazy hanging man is right there. Move a little closer and you'll be, once again, warped to the demon world. Here, you'll have to find 8 red orbs to unlock the chest. Once you do, The Bishamon sword is yours.

When you have Ako's White Vest equiped rotate the right analog stick and your life will replenish at least 2 times faster.

When you pass the battle where Samanosuke is controlling the Oni army and enter the outer keep for the castle, walk over to the left until you can see Jacques up close and nothing else. Equip Ako with the red vest and start absorbing souls with your gauntlet. The Oni soldiers in the same area will continue to fight and defeat the continuously spawned Genma soldiers. It is important not to stop absorbing the souls, because with each soul absorbed will add to the multiplier bonus for number absorbed.