A timing game you play by ear.

Two short beeps mark out a gap of silence. Reproduce that gap and you climb a step of light; the closer your timing, the higher you go. Every level leaves you a little less room, down toward the limit of what a person can hear. It is free, needs no account, and plays right here in your browser. If you would rather have it as an app, it is on Google Play too.

There are two ways to play. Free climb is endless, where you chase your best level and feel your ear get sharper over time. The daily challenge is ten fixed steps, the same for everyone that day, with a result you can share and a streak for coming back. Your scores stay on your own device.

manualHow to playControls, the readouts, how each level tightens, and recovering from a fall.why by earThe science of timingWhy your ears read time about ten times more finely than your eyes.the fixLanding late?How wireless headphones and your own timing throw you off, and how to calibrate it out.once a dayThe daily challengeTen steps, one attempt, the same puzzle for everyone, with a shareable grid.play by earAccessibilityHow a fully blind player plays it start to finish, plus buzz mode.