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Instructions: you've to confront the bosses of varying power, after every five levels. use your mouse to aim and left click to fire your weapon. by pressing the a key you can call for help to decimate the enemy forces, but be warned that the lower levels of warriors are nearly ineffective against high level enemies.

at the end of each level you can choose to spend your points and buy various upgrades, which make your weapons more powerful. you can also upgrade the health and strength of your tower and town.