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Use the←mouse to set↑towers and buy upgrades.
Tower Defense is a great 2D free online strategy game. In which, you will start a combat against waves of invaders. They are coming and you need to build up turrets as soon as you can. Buy appropriate weapons and set them down properly. They will attack and prevent those enemies. However, you can get troubles when you progress. their power will be increased and you have to purchase upgrades from the shop quickly. Are you ready to stop them? Good luck!