It measures sequential working memory — your ability to remember not just which tiles lit up, but the exact order they appeared in. The sequence is replayed from the start and grows by one step every level.

Most people manage a sequence of 8 or 9 steps. Reaching level 12 is excellent, and anything beyond 15 is exceptional. One wrong tile ends the test, so a single lapse of focus is costly.

Turn the sequence into a path — imagine drawing a line through the tiles in order, or give each tile position a number and rehearse the digits. Spatial and verbal codes together hold much longer sequences than either alone.