Hold down left mouse button while typing 'LARSXViii' to enter the colour mode which is controlled via the numeric keypad.
Press 'Q' while the game is paused to enter the music mode.
Press C, X, B, Y, A, Z, Start during the introduction sequence
Highlight the "Shurikens" selection on the options screen. Hold L + R and press C, A, B.
Highlight the "Game Start" selection, quickly press A, Z, B, Y, C, X, then start the game.
Highlight the game start selection at the main menu and press A, B, C, B, A, Start. The game will begin with no lives remaining, no continues, and only one HP.
When the shinobi logo appears hold down the letter 'T' and move the mouse to control it.
Pause the game and type 'LARSXViii' for infinite credits.
In Shinobi there are guys that duck down behind boxes.
There is a easier way to kill them then jumping over boxes.
First get the enemy half-way on screen, then face the other direction and shoot toward the opposite side of the screen.
If done correctly the enemy will die.
When the Ninjas apear in the beggining scene press up and button two.
You should enter a screen where you can play sound effects and listen to stage music.
Pause game play and type larsxviii.
Pause game play, hold the Left Mouse Button and type larsxviii.
Pause game play and press Q.
Pause game play when facing the helicopter Boss with at least two lives remaining. Then, type helicoptertootoughforme, resume game play, and intentionally lose a life.
When the Title Screen with the face is up, hold Down and press Button 2.
You will be able to select your mission and scene by rotating the numbers with the d-pad.