Stop the invasion before the enemy reaches our cities! Alien life forms have been detected and our army has mobilized its defensive tower forces to protect us.
You're on a rescue mission. Get all your wounded soldiers out of the enemy territory. Just watch out for soldiers that have already transformed into zombies.
Use towers to build a labyrinth from entrance to exit. Each tower can be upgraded 4 times. With each wave, enemies will become stronger, so use money you earned to upgrade reasonably.
