Sliding the wall along the floor you push and shove until it reveals this
A short set of steps and metal double doors
Ummm Bad News SkullyChaos......
Standing on the glass platform in Stage III, You look around, the door into Stage IV is open and you can hear the hiss of the vents.
The platform creaks and tilts beneath you,
and looking down you see the metal pyramid counterweight laying amoungst the spikes some distance below.
You have no way now to re-tilt the platform and escape Stage III,
The air is heavy around you....
and soon you are feeling weary....
eventualy you close your eyes,
...and never wake up....