Decant

Decant looks like a test-tube colour-sorting puzzle, but it quietly rewrites the rule everyone knows: here, colour is density. Click a tube to lift its top band — the lightest exposed colour — then click another to pour it, and instead of stacking on top, that band sinks to its own weight layer in the target tube, sliding under lighter colours and shoving them upward. Every tube stays permanently sorted heaviest-at-the-bottom, which is exactly how you dig a colour out of the middle of a stack: drop something heavier and watch the pile reorder itself. You win by sorting each colour into its own tube, with five undos and a handful of empty tubes as scratch space — though fill both empties and you have boxed yourself in. Merging same-colour bands and setting up cascade pours that chain into their own merges is where the points and the elegance live. There is a shared daily puzzle with a streak to protect, plus easy, normal and hard boards. It is free in the browser, and beating par pays a completion bonus.