Your missile outpost has been discovered, and the enemy is sending its best tank battalion after you. Use your radar to help watch for incoming tanks, and try to blast the enemy cash transport vehicle for extra money. You'll be able to restock your weapons and upgrade your health between levels. Note that the enemy tanks appear yellow on the radar while they're approaching; they turn red when they've got you in firing range. Cash transport vehicles appear green on the radar. Avoid shooting medic and nuclear transport vehicles.
Controls: Arrow keys to move/aim; spacebar to fire; W to change weapons.