rest on the centre · press space or tap when you sense a light — without looking
Periphery
Rest your gaze — and your cursor — on the centre dot. Lights will bloom at the edge of your visual field. When you sense one, press space (or tap), without moving off the centre.
Look directly at a light and it vanishes. Twelve lights, growing fainter as you go.
This is how elite athletes train: the whole field at once, no darting.