Stack Sort

Stack Sort is a puzzle you can finish on the train.

Pour the blocks between stacks until every colour sits in a stack of its own. A pour lands on a bare stack, or on one whose top colour matches, so a board is worked out rather than guessed. Sort it in as few pours as you can, and as quickly as you can.

Everyone plays the same board on the same day, so the score you post is a fair one. Come back tomorrow and it is a fresh board, with the streak still counting.

Free to play:

* The daily board, the same for everyone
* Practice boards at two sizes, with a fresh shuffle any time
* A worldwide board for the day, working offline
* Races: two runs of one board, watched as they happen
* A streak which counts every day in a row
* A spoiler-free result image to share with a challenge
* Plays offline, with no account needed

One plan opens the rest:

* Every block theme, from Orchard to Meadow, Ember, Dusk and more
* The Sharp pouch, eight colours at once
* The whole daily archive, so any past board can be replayed
* No adverts at all

Stack Sort is free to play and supported by adverts. Monthly or lifetime removes every advert.

A hint is always there, and it costs fifteen seconds. Practice between days. Take on today's board when it lands. Watch the streak build.

One colour at a time.

Recent changes:
Version 1.2 brings adverts for free users, which keeps the daily board free to play. Monthly or lifetime removes every advert.

Sort today's board and the streak grows. Miss a day and it starts again from one, like a small tragedy.

Race a friend over the same board and watch both lanes fill. Fewest pours wins.

Practice between days. Happy sorting!