Where things were, not the order they came in. A grid flashes with a handful of cells lit for a second and a half — then goes dark. Tap every cell that was lit. Each cleared level adds one more.
The Science: Based on the Corsi Block Tapping Test (Corsi, 1972), used in clinical neuropsychology for over fifty years to measure visuospatial working memory. Average adult span is five to six cells.
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