Control your tanks with WSAD or Arrow keys, use left mouse button to fire. You get to repair or upgrade your tank before every level. Upgrading add-on will install new and more powerful weapons on your tank! Each mission consist of 5 to 8 worlds. If you are destroyed in a world, you will have to repeat the whole mission again, so remember to repair your tank before you begin OR you can choose to save your repair money to upgrade your tank, the decision is yours! You are always outnumbered by your enemies, so try to keep moving to evade the bullets! Enemy rockets and some other bullets can be shot, but be careful, the explosions will still damage you.