Hue Stack

Hue Stack is an original color-sorting puzzle built for the browser. Tap a tube to lift its top color group, then tap another tube to move it — match 4 of the same color to clear a tube and score. Every few moves, a new block "drips" into an open tube, so you're always racing to stay ahead. Colorblind-friendly shapes, no login, no download — just tap and play.