It seems the popularity of d_of_i's blog, Dofi-Blog, has inspired the author to make available some previous work with Processing, and the best of the bunch is this Cat Sledging racer that pits the player against seven (7) other computer controlled sleigh cats.
Use the [Z] and [X] keys for control during the race. [Z] will lean the cat back and cause the sled to rotate counter-clockwise, while the [X] key leans the cat forward and will rotate the sled clockwise. Use these keys to perform somersault(s) to gain a boost in speed; best when performed over a hill that sends you airborne. Press the [R] key to retry the race from the beginning; press the [T] key to return to the game's main (title) menu.
For those who just like to watch, there is even an "Auto-play" mode that lets you watch the computer race against itself. Click.