There is a radar location that you must defend. Once it shatters, you lose. Moreover, you have to destroy all enemy tanks in order to complete each level. So don't go too far away to chase after enemy tanks since your radar/base also needs protection.

Ultimate Tank has large levels that can make you stay playing for fun. The higher the levels you are going through, the more complicated the circumstances you will be facing off. Furthermore, various weapons, bonuses, and upgrades are available in every levels, makes it more interesting.