Only the current version so far — new entries appear as the game ships updates.
The screen stays dark until a random moment when it flashes green. Tap as fast as you can — your reaction time in milliseconds appears immediately. Five rounds per session, with delays ranging from 400 to 4000 milliseconds. Tap too early and earn a penalty. Averages under 200ms earn the Lightning rating. Track your best and average across sessions to see improvement.
