A calm puzzle stops being calm the moment it needs something from you
The sorting genre is full of apps that are pleasant for four levels and then start bargaining. An advert between every attempt, a hint you have to watch a video for, a life system that empties exactly when you were enjoying yourself. The puzzle underneath is usually fine — it is everything bolted around it that turns a quiet ten minutes into a negotiation.
Hueflask has none of that, because there is nothing in it to sell. Hints are free and unlimited, undo costs nothing, restarting a level costs nothing, and no screen ever interrupts a level to show you something. What is left is the part people actually came for: tubes, colours, and the quiet click of one resolving.
Every level ships inside the download, so the app opens the same on the tube, on a plane, or with the router unplugged.
Hueflask
Tubes arrive holding a jumble of coloured balls and the job is simple: move them until every tube holds one colour. Tap a tube to lift its top ball, tap another to drop it — but a ball can only land on its own colour or into an empty tube, which turns each level into a small logic problem about untangling the mess without stranding yourself. Plan ahead, spend your empty tubes carefully, and enjoy the moment a tube resolves into one clean colour.
Undo a move or restart the level whenever you like, and take a hint when you are properly stuck — all free, all offline. Hundreds of handcrafted levels climb gently from easy warm-ups to arrangements with more colours and more tubes than you will want to admit.
The one rule, and nothing to solve
Tap a tube to lift its top ball, tap another to place it. There is no goal here and no level to finish — this is just the rule that every level in the app is built on, with three tubes and no way to win.
Tap any tube to lift its top ball.
Three tubes, one arrangement, no level and no score — you cannot win this and there is nothing to save. Hueflask is the rest: hundreds of arrangements built to be solvable but not obvious, climbing in colours and tubes until an eight-tube board feels reasonable.
Who publishes it
EmberHarbor Digital is the app name used by Sparx Electrical Limited, a company registered in England and Wales. The code, the artwork, the level set, this website and the Google Play account are all handled from the address below.
A level that looks unsolvable, a hint that misfires, or a question about privacy — mail reaches the person who wrote the app.
harbour@sparxelectrical.lolEmberHarbor Digital is a trading name of Sparx Electrical Limited, registered in England and Wales at 2 Corona Road, Langdon Hills, Basildon SS16 6HH. Hueflask, its levels and its artwork belong to the company. The Hueflask privacy policy applies to the Android application com.sortwell.hueflask. Copyright 2026.