Caves.
Guard.
Come closer...
Railgun is a perfect weapon to fight with flying soldiers.
Hyper blaster.
The reactor.
Clearing room with BFG 9000.
New gun in your arsenal.
You must kill the monsters before you can use the lift.
Proximity grenades.
Chainfist.
Plasma Beam.
Warehouse.
Battle on surface.
Gate to Dentention Center.
Sewers.
New enemy - spider.
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