Speed trial mini-game
Collect all 20 Fluorites (blue rocks) while playing. Finish and save the game. The Onimusha Spirits speed trial mini-game will be available. Finish the mini-game to access an option to play the regular game with the Bishamon Sword, unlimited ammunition, 99 Soul Absorbers, and automatic magic regeneration.

Finish the game with an S rank by acquiring most of the Fluorites. Choose to begin a new game and an option for Kaede's new princess dragon design costume will be available. She wears a red skirt with little wings on the back and a small tail.

Easy mode
Start a game and die roughly ten to fifteen times. After enough deaths, a message will appear, stating that a new easy mode is open. Note: You cannot achieve an S rank when playing in easy mode.

Onimusha 2 FMV sequence
Finish the game and save. Choose to begin a new game and a "Special Report" option will be available. This allows a small sequence from the game's sequel to be viewed.

Hints & Tips

Bishamon Sword
In the Demon Realm (just after you destroy the Ultimate Creation) is a save mirror and three doors. Go to the door that resembles an iron gate. It will not open at first. Use the Bishimon O flute on it and enter. Go to the Bishimon Sword jutting out of the Skull Demon wall object and take it. It is more powerful than all three of your weapons put together, and it has speed. The sword also has an unlimited supply of magic.

Bishamon O Flute
There are two places in there game where a very strange man hanging from the ceiling by his feet stares at you and ignores you. Father in the game, after you use the Evil Plate and open the door, he will talk to you. The man will now take you (whenever desired), to the Dark Realm. In the Dark Realm, kill monsters until two portals open, one to go up and one to go down. Keep going down to the final level (9th or 10th) while gathering all the items en route. Open the box on the deepest level to obtain the Bishamon O flute. Keep the flute just before the last fight with the Demon King. It is required to get the Bishamon Sword.

Enhancing
When enhancing, gather roughly 25,000 souls. The number next to the soul meter should say 25. Enhance all of your weapons and Orbs to level two. After collecting the Wind Orb, use the left over souls to bring that to level three, since it is weak.

Great armor
There is a chest behind the waterfall containing the great armor.

Better gauntlet
Attain 20,000 souls and when you go to enhance you will have a better gauntlet. Go when you have 50 to get the Golden Ogre Gauntlet.

Capture 50,000 souls to obtain an even better gauntlet.

Flourite locations
Collect each of the 20 Flourites listed below to access the Oni Spirits mini-game.

Go to the upstairs level of the Keep, and pass through the room just past the red magic door on the catwalk. Step through the next room to find the Flourite under the stairs, near the treasure box containing the Arrows.

Go to the upper reaches of the Keep. You will find a Flourite across from Volume Two of the Seiryu, just after the intermission sequence where Tokichiru takes off into the night.

Go to the Keep Underground. Head down the second hall of glass-encased red samurai. There is a Flourite in the left corner, near the last samurai.

A Flourite can be found in one of the small alcoves with brown doors near the Seiryu in the Under Temple area.

Just after the Boss fight in the South area, break some urns and search the floor under them to find a Flourite.

In the Keep after running into Kaede with Yumemaru, you will find the Flourite in a small cupboard over the treasure box near the stairs.

Go to the West area. You can find a Flourite just outside the door after obtaining the Vision Staff with Samanosuke.

Go to the West area. There is a Flourite on the hill with the sled just outside the castle.

Go to the West Area. This is a Flourite blinking in the path on your way to the room with the statue where you got the Matchlock.

Go to the Keep Underground. A Flourite is hidden inside the iron maiden in the same room where you get the Blue Key.

Go to the West Area when playing as Kaede. Find the secret room and use the Gear to enter. There is a Flourite in front of the Buddha statue.

Playing as Kaede in the West Area. Step into the burning room just past the gate that required the Gold and Silver Plates. Through the door left of this entrance is a narrow staircase. Next to the staircase in a heap of barrels, which contains a Flourite.

Go to the East Area with Samanosuke. There is a bell on top the roof. There is a Flourite In the walkway around the bell.

When playing as Kaede in the East Area, climb a ladder in the bridge house Magic Mirror room. Destroy the crates here to find another Flourite.

Go to the East Area while playing as Kaede. You can find another Flourite on a chest in the room where you get the final book of the Suzaku.

A Flourite is in the sixth level of the Dark Realm.

A Flourite is in eleventh level of the Dark Realm.

A Flourite is in the seventeenth level of the Dark Realm.

Play as Samanosuke and find the Flourite on the pier just past the Magic Mirror room in the East Area.

Go to the East Area. Just when you begin playing as Kaede you will enter a shrine just past the locked door you need to pick. A Flourite can be found on the floor just to the right of the door.

Easy souls
If you are low on health at the end of the game prior to facing the Boss go to the entrance of the keep for some battles. By now they should be easy just absorb the souls to raise your health.

Easy kills with Kaede
While attacking any enemy, hold R1 and press Up. You will then jump behind them. Keep pressing Up and attack while holding R1 and Kaede will automatically kill the enemy (slits the throat, etc.).

Extra red souls
When fighting enemies around the floating blue skull-ball things, allow them to absorb the souls that are released when you slay an enemy. When you kill the skull-ball, you will get many more red souls than if you had absorbed them straight from the demon.

At the end of the game, when you are walking down the spiral pit, you will reach a pink and black blob that squirts out the "squid" monsters. Stand just to the left of where they land. When they are getting up (low enough that they are off-balance, but high enough that your foot can get to them), kick them over and stab them when they are laying down. You can easily get your red soul bar filled up 30 times using this method.

Beating Fortinbras
Start off by doing any type of attack that will make Fortinbras fall to the ground (special attacks will make this fast and easy). From this point on, just keep kicking him to death. Press Down + Attack, move forward, Down + Attack, and repeat. This will take awhile. You will never get hit, plus he will not be able to attack you if you can keep the chain kicks going.

Use this strategy if you have only your three normal weapons, and not the secret sword. Kick him, then slash him with the Enryuu Fire Sword. It is the strongest. Give him roughly five kicks and then deliver a Thunder Orb magic. Repeat this until you have no more Thunder magic remaining. Then, use the Wind Orb magic to knock him down. Use the Fire Orb and some kicks. Most of his attacks are easy to dodge, except the fire.

Beating giant monsters with ax
When fighting the giant monsters with an ax, hold R1 and tap Forward. Directly after that, attack him swiftly. Then, hold R1 and tap Back a few times. Repeat this six or seven times and he will fall on the ground. Run over to him and tap Square as you stand on him. Samanosuke should put a sword through him to kill him. This will result in more souls than if you used magic against him. If the same thing is done with magic, he will fall straight away.

Beating Marcellus
At the end of the game you should have every weapon and orbs at the maximum. When fighting Marcellus again, kick him and use the Thunder Orb's magic. For some reason, this is stronger than his other attacks.