Wait for the square to turn green and then click or tap as soon as it does
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How to Play
Reaction Only: Wait for the white square to turn green, then press the spacebar (or left-click) as fast as you can. Too early = fail.
Decision (â / â): The square will turn green and display â or â. Press the matching arrow key (or click left/right mouse button) quickly. Wrong direction or early = fail.
Each round has 10 trials. After completing a round, you can optionally save your session.