Space bar - Throw Deer.
Left/Right arrow keys - Move Deer left and righ.t
Choose from 3 types of deer to build a "team" of 9 deer. (Note: Each type of deer has specific damage-wreaking capabilities.)
Throw the deer from the helicopter, damaging the passing cars as much as possible.
If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).