If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Drive the police car and search all the mobsters in the city. When you find them, destroy their cars by crashing your own vehicle into them. Use your arrow keys to drive and the space bar to brake and be sure to pick up all the power ups along the way. Destroy all your targets before the time runs out if you want to move on to the next level. Have a blast!