Build your towers along the path and prevent the zombies from reaching the end! Increase your tower's power, range and the rounds per minutes that can be fired by upgrading them. Upgrades are important since the invading zombies become stronger and stronger in each wave!
Use the mouse to play, click a tower from the inventory to buy it and place it in a strategic position on the game field, press Escape if you want to cancel it. Click on your towers to see the option to sell or upgrade it.