Xeno Tactic is one of the most popular and played tower defense on flash. This game is something like classics in the tower defense genre. Critters start at the left side and their goal is to reach the right side of the room. Your goal is to prevent that and you can use several types of towers to do so. Place your towers like labyrinth so the enemies will have to move longer and get more damage. Upgrade your turrets to have better attack.