Snap

The magical number seven

In 1956 psychologist George Miller described the famous limit of human short-term memory: about seven items, give or take two. Snap measures your digit span directly. Most adults reliably hold seven digits, many reach nine, and getting past eleven without a memory trick is rare. Where you top out is a real, repeatable property of your working memory.

Chunking, the memory cheat code

The seven-item limit is about chunks, not raw digits. If you group 1, 9, 8, 4 into "nineteen eighty-four," that is one chunk instead of four. Skilled players break long numbers into pairs or familiar dates and remember the chunks. With chunking, spans of fifteen or more become possible, which is why this game caps the score rather than the length.

How to push your span

Say the digits to yourself as they appear, rehearse them in a steady rhythm during the blank moment, and group them as you go. Visual learners sometimes picture the digits on a strip. The blank second between seeing and typing is when memories are lost, so fill it with active rehearsal.