Two lines run in different meters at the same time; tap each on its own pulses and lock the shared downbeat where they collide.
A metronome ticks while two lines, A and B, run in different meters (like three against four). Tap each line on its own pulses as a playhead sweeps across. When both lines land together on a shared downbeat, you lock it, and downbeat locks are weighted most heavily in your score.
Polymeter is a coordination game about holding two meters at once and finding their common downbeat.
Tapping two lines running in different metres — three against four — is polyrhythm, where the lines coincide only at the cycle's end.
Requiring both hands independently, with a playhead showing the alignment, is the original structure.
Three against four is the standard first case because the maths is visible: the pattern repeats every twelve subdivisions and the hands land together exactly once. Learning it as a single twelve-unit pattern is the trick; learning it as two independent streams is the skill.
Polymeter is a polyrhythm coordination game about holding two meters at once and finding their common downbeat. It is an original, free browser game built in-house for PlayPendium.