Abyss Cave places the player among the Abyss Raiders, an elite squad sent into a colossal cave after researchers disappear. A powerful energy disturbance knocks the members unconscious and sends their drilling trucks out of control; the player awakens deep underground in a severely damaged vehicle. The mission is to survive, explore the underworld, uncover its secrets, and escape.
Defense and exploration share the game’s focus. Players construct turrets in real time to repel continuous attacks, assembling modular devices for different functions. Battle turrets need weapons and ammunition boxes to operate, while a robot assistant helps in fights, collects resources, and maintains turrets. Players can also develop weapons, gear, and turret units, then search the vast cave for scattered relics using varied weapons and ammunition.
Abyss Cave is listed as single-player, framing its combination of combat, resource collection, and underground exploration as an individual expedition rather than a multiplayer squad activity.
