Reaction Time Game
This one is a game, not a measurement. Every round the screen flashes green and you have to react before a shrinking time limit. Clear a round and the limit gets tighter. One slow tap (or one jumped gun) and the run is over. Beat your best.
Tap to play
React before the limit. It gets faster every round.
Why pressure changes everything
A single relaxed reaction and a reaction under a tightening clock are two different skills. In the standard test you have five calm goes and we keep the best. Here you get one life and a limit that keeps shrinking, so the moment your reaction wobbles even slightly, the run ends. That is much closer to a real game or a real start line, where there are no retries.
The interesting thing is how people fail. Most do not get slower. They get jumpy. As the limit drops, the temptation to pre-empt the green grows, and a false start ends the run just as surely as a slow tap. Learning to stay loose while the pressure climbs is the whole game.
Want to know your honest baseline first? Take the reaction time test for your calm best-of-five, then come back and see how many rounds you can defend it for.