A tower defense
Eight races. One circle.
A tower defense
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Solo: only your spawn pen sends creeps. Classic: the original 8-slot rules, where empty pens still send creeps at a third of the rate. Built for teams; very hard alone.
Creeps circle the rings forever. The game is lost when more than 490 are alive. Pick a tower in the bar at the bottom, then tap green ground to build it. Tap a tower to upgrade or sell it. Tap open ground to send your hero there (right-click or WASD on a keyboard). Drag to pan, pinch or scroll to zoom.