It's an interesting game that's slightly Resident Evil 2 (the movie) esque. You're in a quarantined city, and you play as either some class of survivor, or a zombie. You have a certain number of Action Points to spend, 50 total, with a refresh time of 1 AP every half hour.
The idea is to explore the city and find useful equipment, and to survive. However, if you die, you become a zombie, but there are ways to be brought back to full life. Check it out it you please.
http://www.urbandead.com/