Shell Shuffle

1. Watch which shell hides the ball
2. Follow it through the swaps
3. Tap the shell holding the ball
4. 3 lives; more shells and faster swaps

Attention. Following one shell through motion is object tracking, and human capacity is famously narrow: about 4 moving objects at once in multiple-object-tracking studies, fewer as speed rises. Street shell games exploit the moment tracking breaks, and level 8 here is built to find that moment honestly, without the sleight of hand.

Pylyshyn and Storm, 1988, Spatial Vision.

Lock your eyes on the target shell itself, not the pattern of swapping. One object, one track.