If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
you and this zoo's animals will enjoy yourselves in the bumper cars. The lion, the zebra, the bear, the rhinoceros, the elephant and the giraffe, they'd all like to compete with you or with each other in their fast and solid bumper cars!
W,A,S,D - Drive.
Spacebar - Use Weapon.
Arrow Keys - Drive.
Page Down - Use Weapon.