The last surviving Lightopus, G4, is on a mission to save his young ones from the monsters of the Abyss.

The young ones are captured in the sealed zones of the Abyss, and the only way to free them is to collect the keys.

The monsters of the Abyss are tough, and it will take more than just a few shots to kill them. Luckily, there are plenty of bullets in the arsenal, so the battle won't be a quick one.

The only way to get through the maze is to use all the available weapons, from a small knife to a high-tech laser gun.