From Eidos Interactive:
Use a rat as a projectile! Its not cruel, they enjoy it really. Slam the bottle with the hammer to project the rat into the air. Warning! The more oomph power you put into slamming the bottle, the less you have to keep the rat flying. Game Instructions: Hold the left mouse button and drag the hammer to hit the bottle. Use the left mouse button to make the rat flap its arms to keep it airborne.
What's new in this version: This version is the first release on CNET Download.com.