Full Health
Pause the game and press Up, Down, Up, Down, X, X, X for full health.
Full Kuji
Pause the game, then hold L + R and press Left, Left, Left, Right, X for Full Kuji.
Unlock Tesshu
Complete the game using Rikimaru and Ayame to unlock Tesshu.
Go to: Tenchu: Return from Darkness Info Page | nGaming Home Page.