Peripheral Flash
Keep your eyes on the central dot. Two digits flash symmetrically to its left and right, then vanish. Enter both. Each level moves them farther out and shortens the flash — measuring and widening your perceptual span.
How to Play
- Keep your eyes on the central dot
- Two digits flash to its left and right, then vanish
- Enter both digits — left first, then right
- Each level moves them farther out and shortens the flash
Example
4
7
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