You’ll see a square flash in a 3×3 grid, and (optionally) hear a sound. Report whether the current stimulus matches the one N steps back. Hits and false alarms both count — this is attention discipline, not button-mashing.
How to play
Position Match: press L when the square matches N trials ago.
Audio Match: press A when the sound/letter matches N trials ago.
Only press when you mean it — false alarms matter.
What it trains
Working memory: update and hold information under load.