Water fountains
They should have had water fountains in the cube. What if you were already dehydrated before arriving in the cube. It would be a lot of exertion going through the cube, and most people would be spent without water very quickly. They would not have the energy to move in the cube for very long. The woman in Hyper Cube had a hangover just starting out in the cube, so she would be in bad shape physically right away.
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