If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Join the military as a tank driver and try to park it in the camp, following the arrow and searching for the highlighted parking spot. But be aware that the military camps are full of obstacles which you will have to avoid, otherwise you might damage your tank. Try to complete your mission before the time runs out. There are eight fun levels available for you to play, so try to complete them all with the best score possible. Have a lot of fun!