Start, then tap Match when the square is in the same spot as N steps back.
No Fibs — Honest Limitations
Dual N-back is a genuine working-memory task. Claims that it raises fluid intelligence (IQ) are weak and contested — the 2008 Jaeggi study didn't replicate cleanly. It likely trains the specific task; transfer to broad cognition is modest. This is a simplified single-mode (position only) version.