1. in order to pick up the Quad Damage item in the room with the Battle Suit you should shoot at the button on the ceiling with any kind of weapon you have (demo).
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2. in the room with a Quad item you can make a rocketjump up, thus getting into a good camping place (demo).
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3. in the room with the Battle Suit you can get at the wall ledge. Come up to the wall and touching it make a strafejump (demo).
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4. plasmajump along the wall to the red armor. Come up to the wall sidelong and start a plasmajump, simultaneously turning to the right slightly. Just several seconds and red armor is yours (demo).
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5. jump at the jump-pad below the Megahealth item and with a strafe in the air turn at the ledge (demo).
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6. if you come up to the Shotgun, turn your back to the teleporter and jump forward, then you’ll get in a secret room with a big health (demo).