The Last Ninja (NES)

The Last Ninja is a NES port of Last Ninja 2: Back with a Vengeance for PC-DOS and other systems.

Cheat Power
A powerful cheat mode exists, but actually accessing it is one of the most complicated methods ever seen.

Start a new game, get the key to the garden gate, go outside and find the shuriken weapon.

Return to the garden gate, open it and go to the next location with the river and floating boat. Stand at the left corner of the square between the bush and the bench, turn to face the leftmost tree at this location, switch weapon to shurikens, and throw them into the same direction. When you have only one shuriken left, a sound will play.

Then you should jump into the river and die six times, so keep all your lives before this place! After the "Game Over" screen, you'll see message "Isn't that lucky! You got CHEAT POWER". Now start the new game again and follow the instructions.

Right and Left buttons on the second controller now switch game locations according to how they appear in the game data arrays, so it may not actually switch to the next location from current location. Be careful, your character may be placed at any point in the next location, including places that may be deadly for him.

The Select button on second controller skips the current level permanently.