A number flashes briefly. In the forward block, type it exactly as shown; in the backward block, type it in reverse. Two misses at the same length moves you on.
How it works
A number flashes briefly. In the forward block, type it exactly as shown; in the backward block, type it in reverse. Two misses at the same length moves you on. Adult averages are roughly 7±2 digits forward and 5±2 backward. Backward span being about two digits shorter is completely normal. Digit span captures one slice of working memory — it is not a stand-in for IQ.
🧠 Free test📅 Last updated: 2026-08-26 · ✔ Reviewed by the All-Lifes editorial team · About · Methodology