A secret energy experiment beneath the town went horribly wrong, unleashing a rift that revived the dead and trapped the area in an endless loop. Now overrun by zombies, survivors must fight through waves of the undead, unlock the town’s secrets, and survive to round 20—where a terrifying boss, the Riftspawn Overlord, awaits. Escape is possible... but only if you live long enough to face the final horror.