This is the classic Tower Defense Game, the gameplay is so simple, but hard to master, just place any colored towers to the grey blocks. Click tower to upgrade or sell it. when you happy, then click start button to start the waves.
Your main objective is to survive as long as possible in this endless waves, you have also infinite number of upgrades of tower, survive in 6 maps and submit your best score!
See in-game instructions for more informations.