[Update, Dec. 8 2008]
I forgot to provide the source code until just before the deadline, and my Internet connection wouldn’t work the last two hours before deadline. Anyway, here is the source:
Sourcecode (not very pretty, mind you. It’s rushed 4kb code.)
My game is called Tekicars4k. My plan is to enter it both into LD13 and the Java4k contest. In other words, it is a 33 hour 4kb game with the theme “roads”. Thanks to the size limitation, there is a grand total of 6 levels available. It is available as webstart and as a CompoGameLoader ZIP file, which has .bat, .exe and .sh (so should work on any OS).
The goal is to place blocks in advance so that each Tekicar reaches an exit of the same color, without colliding with any other Tekicar. Walls will turn Tekicars clockwise, roads will speed them up, and arrows will re-direct them along the arrow.
As soon as you click “Go!”, the test begins – if you pass, you reach the next level.
Note that the ZIP file is way larger than 4kb, mostly thanks to the .exe wrapper. The game JAR itself is only 4kb.