Star Hopper

Twenty-eight crystal cubes stacked into a pyramid, hanging in open space. Hop from cube to cube and each one lights beneath your boots — light them all and the pyramid resets one level harder. A void serpent hatches at the summit and comes down after you, so keep an eye on the two escape discs floating off the edges. Step off anywhere else and it is a very long fall. Ace the machine and the front desk will postmark your own Star Hopper Ace stamp.