The game is playable in normal mode or hardcore mode. We have crash landed on a piece of rock. The ship is badly damaged and the only way we can get out of this alien place is by repairing the ship. The hostile creatures of the planet will not be kind enough to give us time to repair the ship and the only option left out is to attack the approaching enemy units and repair the ship simultaneously. The fight will be rapid just as the repairing has to be rapid because the waves of enemies never cease to come attacking the ship and us.