Toggle Special Abilities ON/OFF:
Pause the game. Hold L1 + L2 and press Up, Up, Down, Down. Release L1 + L2 then press , , R1, R2.

Increase Kanji Level:
During gameplay, press Up, Up, Down, Down, , , on controller 2.

Play as The Real Rikimaru:
At the Main Menu, Hold R1 + L1 and press Left, Left, Right, Right, Up, Up, Up, Up.

All characters:
At the Title screen, press L1, R2, L2, R1, Right, Left, L3, R3.

Bonus level:
At the Title screen, press L1, Up, R1, Down, L2, Right, R2, Left.

Demo level:
At the Title screen, press Up, Down, Right, Left, , , .

All missions:
At the Mission Selection screen, press L1, R1, L2, R2, Right, , L3, R3.

All mission maps:
At the Mission Selection screen, press R3, L3, R2, L2, R1, L1.

Recover health:
Pause the game and press Up, Down, Right, Left, , , .

Toggle special abilities:
Pause the game, hold L1 + L2 and press Up, Up, Down, Down. Then release L1 + L2 and press , , R1, R2.

Show Score:
Pause the game. Using a controller plugged into the second port, press Right, Right, Left, Left.

Increase Score:
Pause the game. Using a controller plugged into the second port, hold L1 + R1 and press Right, Right, Left, Left.

All items:
At the Item Selection screen, hold R1 + L1 and press Up, , , Left, , , Down, , , Right, , .

More of each item:
At the Item Selection screen, hold R2 + L2 and press , , , Up, Left, Down, Right.

Unlimited Item Capacity:
At the Item Selection screen, hold down L1, L2, R1, R2 and press , , , Up, Left, Down, Right, , Up, Right, Down, Left

Control Enemies:
You need two controllers to do this cheat. During play in Story Mode, pause the game on controller 1, then on controller 2, press L1, R3, R1, L3, Right, , Up, , L2, Left, , Down, R2. The game will unpause and you may control the nearest enemy using controller 2 when your character is near enough.

B-side dialogue:
Finish layout 1 with a Grand Master rank. You'll now find a "B-side dialogue" option at the Sound menu.

Thanks to Revolution readers Brandon Mitchell, Chris Collins, ADRIAN, Setsumaru, Loki, Nick F., Mightymegit, Marcus Ivy, and qiao!