Farting

In fifty levels of Flash platforming, you guide your little aviator-goggled cat from entrance door to exit door, avoiding long-legged bird things, other cats throwing paper airplanes at you, something like sea urchins, and a variety of other enemies. Arrow keys for movement, with the "up arrow" to jump.

A completely straightforward, if competent platformer; the "innovation", if it can be called that, is that by pressing and holding the up-arrow once in a jump, your character, um -- expresses gas, giving himself additional velocity. In essence, you can fly for a brief period of time. However, the reservoir of your bowels is apparently limited, and the once the episode of flatulence passes, you begin to fall. Thus, just as one must time jumps, one must also time one's, ah, farts.