Ninjah’s a nice game. I thought it was going to be your average “platform game with a grappling hook,” but there are some interesting elements to this one, not the least of which is the color-switching mechanic. Stepping on the checkered colored blocks switches your character to that color, whereupon every other color kills you on contact. The levels are designed around this mechanic, forcing you to perform some pretty crazy stunts that involve grappling, firing a gun, and slow-motion (these skills are enabled or disabled depending on the level).
There are fifty pretty tough levels and a level editor, so there’s plenty to keep you busy. Just be prepared to die like Wile E. Coyote.