How to play

The runner moves to the right on its own and never stops. Tap anywhere on the corridor, or press the space bar or Enter, and gravity flips: the runner falls to the other side.

Tap again while it is still in the air and gravity flips straight back, from wherever the runner happens to be. There is no jump and no teleport, so a flip has to be started early enough to finish.

Blocks stand on the floor and hang from the ceiling, and touching one ends the run. The middle of the corridor is always safe, which is what makes a mid air correction a real option.

Some blocks come in pairs: one on the floor and one on the ceiling a little further on, so you have to be up for the first and down for the second.

Every block you pass is a point. A gold star floats in the middle of the corridor where nothing can hit you: catch it and your points double for a few blocks. The star is celebration only and never changes what the cache needs.

The corridor speeds up as your score climbs, so the same gap gives you less time to think.

The moment you reach the goal your reveal is locked in and safe, even if the very next block catches you.

Sound and vibration are both off until you turn them on, with the two small buttons above the corridor. Vibration needs its own switch on, and what it does depends on the phone. On an Android phone the buzzes tell the moments apart, so a perfect and a miss feel different. On an iPhone or iPad you feel your own tap and nothing else, because that is the only thing iOS lets a web page do.

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