Classic Round-Based Action: Fight off increasingly difficult waves of monsters. The higher the round, the harder they hit and the more relentless they become! 1-8 Player Co-Op: Survive the nightmare alone, or team up with up to 7 friends to hold the line. Use your hard-earned points (or find hidden keys) to unlock interactable doors, open up new areas of the map, and find better loot. Grab your weapons, watch your corners, and see what round your squad can reach!