If you're looking to waste some time at work while waiting for the holidays to come, or if you're at home and need a break from all the family cheer, there are worse things you could do than killin' zombies.
Markus Persson has put together a great little tribute to Valve's successful zombie co-op shooter with Left 4k Dead -- his submission to the 2009 Java 4kb Competition.
What's your highest score? Mine was an embarrassing 188 before I decided to submit this. Surely you can do better.