Don't let the creeps complete their path. Do that by building defense towers along the way. Manage and upgrade them to get to higher levels. You have 6 types of towers to choose from once you have enough gold.
Defend against the robo-bugs that are trying to take over your base. Unlock and upgrade new areas and special weapons. Collect enough exp points to get more powerful weapons.
Guide sargeant blitzy through the jungle to carry out his highly secret mission to stop the general and his evil plans! Luckily blitz is a well trained professional that can handle every situation.