You are the observer. Ghosts inside your gaze freeze. Ghosts you can't see hunt you.
Eat every photon. You can't watch them all.
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Paused
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Level cleared
The wavefunction holds.
Decohered
You were caught unobserved.
Score 0
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How to play
You steer the cyan observer through the maze, eating photons. Steer with arrow keys / WASD, swipe, or the pad. Clear every photon to advance a level.
Your vision cone points where you're heading. Any ghost caught in it is measured and freezes solid — you can even slip right past a frozen ghost. But you can only look one way, and there are more ghosts than you can watch. Every ghost outside your cone is free to move, and hunts you down. If a moving ghost reaches you, your state decoheres — you lose a life.
Grab a measurement burst (the big pulsing photon in a corner) to observe the whole maze at once: every ghost freezes and turns edible for a few seconds. Eat them for escalating points.
The ghosts: Collapser takes the shortest path to you. Tunneler can slip through a wall at a corner. Drifter wanders unpredictably. Entangled speeds up the more ghosts you're watching — it feeds on divided attention. They periodically scatter to the corners, so watch for the lull.
In Blind corners mode, walls block your gaze — you only freeze what you can actually see.