Win the battle against their enemies, go up a level and buy the best weapons.
When you level up weapons and benefits are being unlocked. By clicking on the floor or on the road can be purchased bombs or towers. Use the shortcut keys in the most complicated stages. The key 1 and 2 change speed of the game.
Z - Buy Tower/Mine
X - Left Upgrade/Dynamite
C - Right Upgrade/A-Bomb