Memorise the cells — then tap them
A set of cells briefly light up — memorise their positions. After they hide, tap every cell that was lit from memory.
Wrong taps count as mistakes. Too many mistakes ends the round. The number of cells to remember increases each round.
Remembering exact grid positions is one of the purest tests of visuospatial working memory — the system that lets you mentally hold and manipulate spatial information.
Distinguishing remembered positions from near-identical distractors trains precision memory — quality of recall, not just quantity.
You must focus intensely during the brief reveal phase. This trains deliberate attentional encoding — the conscious effort to commit information to memory, a skill that improves all learning.