Story

Characters

Walkthroughs

Codes

NTSC codes
source: Gamefaqs, Tenchu.de

Unlock Tesshu
At the press start screen, press L1, R2, L2, R1, right, left, L3, R3

Restore health
During mission, pause the game, press up, down, right, left, square(3x)

All Ninja Items
At the item selection screen, hold L1 and R1, press up, square(2x), left, square(2x), down, square(2x), right, square(2x)

Increase the amount of Ninja Items
At the item selection screen, hold L2 and R2, press square(3x), up, left, down, right

Unlock all missions
At the mission selection screen, press L1, R1, L2, R2, right, square, L3, R3

Unlock all 3 mission layouts
At the mission selection screen, press R3, L3, R2, L2, R1, L1

Unlock Demo mission
At the start screen, press up, down, right, left, x(3x)

Unlock Rikimaru's secret mission 'Through The Portal'
At the start screen, press L1, up, R1, down, L2, right, R2, left