How to Solve Any Water Sort Puzzle: A Strategy Guide

Water sort puzzles are the most downloaded sorting game on the planet, and also the ones people get stuck on the fastest. The rules are trivially easy — pour coloured water between tubes until every tube holds a single pure colour — but around level 30 the difficulty spikes and most players start restarting levels out of frustration instead of solving them. This guide walks through the full toolkit of moves that the top solvers actually use, so you can stop restarting and start clearing.

The two rules the game never tells you

Before any strategy, it is worth stating the two rules the game enforces silently:

• Colour matching. You can only pour into a tube whose top colour already matches the colour you are pouring, or into a tube that is completely empty.
• Contiguous blocks only. When you pour, the game transfers the entire contiguous top block of the source colour in one go. If the top of your source tube has three blue units stacked together and the destination has room for two, two units move and one stays behind — you do not get to split a block mid-pour.

Every rule below flows from those two facts.

Rule 1: Protect at least one empty tube at all times

An empty tube is the most valuable resource on the board. It is the only place you can move any colour into without needing a colour match first. If you run out of empty tubes, your options collapse fast and you usually have to restart.

The practical consequence: never fill an empty tube just because you can. Only fill an empty tube when the move you are making directly finishes a colour, or when it frees up a second empty tube later in the sequence. Treat the last empty tube like a rescue slot — reach for it only when you have no other legal move.

Rule 2: Finish the easiest colour first

Look across every tube and find the colour that already has the largest pure block. That is almost always the cheapest colour to finish, because most of its units are already in the right place. Finishing it gives you back one full tube as free workspace, which usually cascades into the rest of the level.

Players who get stuck at the hard levels tend to do the opposite: they try to fix the most-mixed colour first, usually because the chaos of it bothers them visually. That is a trap. Clean the easy wins, then use the empty tubes you just earned to rearrange the harder colours with room to breathe.

Rule 3: Never create a mixed stack on an empty tube

This is the single most common mistake. A player sees they can legally pour three red units onto an empty tube, and because the move is legal they take it. Two moves later, they need that empty tube for something else, and now it is locked with red units that are not yet part of a finished colour.

The rule: when you pour into an empty tube, you should be committing to finishing that colour in that tube, or using it as a deliberate relay. Random "let me just put this over here" moves are what cost you levels.

Rule 4: Plan in 2-move chunks, not single moves

Top solvers do not play water sort one tap at a time. They play it two taps at a time. Before tapping, they ask: if I pour this, what pour do I want to make immediately afterwards? If the answer is "nothing obvious", the first pour is probably wrong.

This mental shift — from "what is legal?" to "what sets up my next move?" — is the single biggest difference between a player who clears 60% of levels on the first try and a player who clears 95%. It is also free.

Rule 5: Undo is not a failure

Every water sort game we feature on SortFun's water sort category has an undo button, and in almost every game that button is free to use. Use it relentlessly. Undoing two moves to recover a better line is not cheating — it is the intended way to play. The only time to restart instead of undo is when you have already locked in a mistake so deep that undoing the whole chain would take longer than starting over.

When the level is genuinely unsolvable from your current state

Sometimes, after six or eight moves, you realise the level is actually in a dead end — no legal pour will free you, and no undo chain leads anywhere new. That is not a bug; it is a signal that your opening move was wrong. Restart the level and pay special attention to your first three pours. They determine 80% of your available options later on.

Pick a level and practise

Reading about strategy only takes you so far. Pick a level you have been stuck on in any game from the Water Sort category, then play it with the five rules above in mind. You will probably notice that your click speed goes down and your pause-before-tapping time goes up. That is exactly right — water sort rewards patience, and this guide should turn "stuck on level 47" into "stuck on level 120" within an afternoon.