Get bonuses:
Get the gold Oboro Clan Coins while playing the game to unlock bonus options in the extras menu, including level select and movies.

Unlock Moritsune:
Get 30 Oboro Clan Coins while playing the game. Moritsune is Hotsuma's brother, and is stronger and faster. However, the Akujiki sword will drain him more.

Unlock Joe Musashi:
Get 40 Oboro Clan Coins while playing the game. Joe's sword damage does less than when using Hotsuma, however his shurikens are unlimited in number, do more damage, but do not stun. Also, since he does not use the Akujiki sword, his energy does not drain constantly.

Unlock VR stage:
Get 50 Oboro Clan Coins while playing the game.

Unlock hard difficulty:
Finish the game under normal difficulty.

Unlock insane difficulty:
Finish the game under hard difficulty.

How to beat Boss 6B:
If you can wait until the Boss lets out the seven little heads, kill them to get a full powered Akujiki. Then, just slash the Boss once and he will die.

How to beat the last Boss:
Attack the crows (the things which shoot out fireballs). Wait until you have about eight crows at once. When you defeat the crows, you should have a pink waves around it. Attack him when you reach that level. Any other color will result in no effect. Keep doing this and you should defeat him.

How to beat Bosses:
A rather easy way to defeat any Boss in the game is to wait until seven or more of their helpers have been summoned. Basically, when you see eight or more of those orbs at the top right hand side of the screen, perform Tate and any Boss in the game will die. REMEMBER: You will not get seven or more minions to spawn at certain Bosses, such as the two helicopters and the giant spider at 3B.

Level 1B: Hidden message:
When you start fighting the Boss in this level, you will see a big sign with lighted letters that read "SKILL UP". When you start fighting the Boss, look at the sign again. The "S" and "P" will burn out and fall off, and the sign will say "KILL U".

Level 2B: Secret area:
When you start the level, there will be a building to the left of you. Go next to it, then do a double jump and a speed dash over it. In there are two Hellspawn and two small "birdhouses" with something in each.