1. ordinary strafejump from the Railgun to the red armor (demo).
Jump 2
2. jump over the gap. It can be done either by jumping about or by ordinary but high-quality strafejump (demo).
Jump 3
3. . in order to get to the top tiers from the central jump-pad, you should jump going along the very end of the jump-pad. In flight just make a strafe to the side needed, after that you’ll hit the floor and land on the second floor (demo).