Rat Splatter (2001)

Official Blurb:
Squishing rats with anvils is truly a rewarding job, especially when you're getting paid for each rat, and especially when you first take the time to breed them in big nests and squish them all at once.

It's fast, it's furious, it's about outwitting your opponents and thinking on your feet. But more important than that, it's a game about dropping anvils on rats. What more do you need??

http://www.savant-garde.com/rats