Match any of the figures and hold it steady to lock it in

Sinehold is a game of steadiness. Tilting your phone tunes the vertical frequency of an oscilloscope beam against a fixed horizontal one. Hit a whole-number ratio and the beam draws a still Lissajous figure — a circle, an arc, a figure of eight. Miss it by a hair and the figure spins.

Six figures can be locked. A seventh cannot be held still at all, however steady your hand.

This device cannot detect orientation. You can try using mouse/touch but the game was designed for devices with motion sensors.