In the game, players take on the role of a specific group with unique abilities as they attempt to fend off attacks on a fortified tower. The objective is to repel waves of invaders, progressing through multiple levels with varying difficulties.
The player's core task is to position units strategically at defensive positions along the tower's perimeter, balancing offense and defense to counter the increasing strength of incoming foes. The game runs directly in the player's browser, with no need for download or registration.