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using the closed pitfall from the torch. as soon as you press the 4th weapon, tap S to step back into the other platform, as the 4th platform has thrown me down into the pit like 30 times. also, you have to remember that you strafe to the left "A" ONCE... i always ended up strafing TWO times, falling into another open gap... so it's S,A,S,A... then you just turn around with E and try to strafe left all the way over to the 5th button...
also... dont forget
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Westmost