Watch the flash. Then tap the same cells last-to-first. Length grows; two misses at one length ends the run.
How it works
Watch the flash. Then tap the same cells last-to-first. Length grows; two misses at one length ends the run. Lab reverse Corsi can be normed. This 4×4 grid is original practice — not a clinical IQ.
⬛ Corsi Blocks — Forward Tap Span🟩 Spatial Span Forward Lite — 4×4 Light Path🧾 Digit Span Test — Forward & Backward🔙 Backward Digit Span — Reverse Only
❓ FAQ
Is this the Corsi test?No. Corsi uses a standard board and scoring. This is a reverse-order 16-cell toy.
Does reverse span equal IQ?No. Span toys wobble with strategy and device lag. This site never reports a deviation IQ.
Same as spatial-span-forward?Forward is a different URL. Here the order is reversed.
📅 Last updated: 2026-08-27 · ✔ Reviewed by the All-Lifes editorial team · About · Methodology