This is an Alien vs. Predator mass destruction game similar to Collateral Damages, Collateral Damages 2, City Smasher or Hulk Smashup. You choose to be the Alien or the Predator. The next thing you need to do is to cause as much destruction and kill as many people as you can before you get killed. Use the arrow keys to move, press Space to jump and X to attack. Pressing space while holding one of the arrow keys will make you attack in this direction. Pressing the up arrow near a building edge will make you climb the building. Pressing X while climbing the building will damage the building.