How to beat Water Sort puzzles: strategies that actually work

Water Sort is one of those puzzles that feels random for the first fifty levels and then, quite suddenly, doesn’t. The change isn’t reflexes or patience. It’s that you stop pouring wherever it’s legal and start pouring where it helps.

There are maybe six ideas involved. Here they are.

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The rules, stated precisely

Worth being exact, because the strategy follows directly from them:

You may pour from one tube into another only if the destination is empty, or if its top colour matches the colour you’re pouring.
Pouring moves the entire contiguous block of that colour from the top of the source, not one unit.
The destination must have room. A partial pour happens if it only has room for some of the block.
You win when every tube holds a single colour, or is empty.

That second rule is the one people underuse, and it’s where most of the leverage is.

Empty tubes are the whole game

An empty tube is not a place to put things. It is your only ability to reorder, and every level is really a question of how carefully you spend it.

Once you fill your last empty tube with a colour that has nowhere to go, the level is usually over even though the board looks busy and hopeful.

So: never pour into an empty tube unless you know what it buys you. The legitimate reasons are:

It uncovers a colour you can immediately place somewhere useful.
It consolidates a colour you can complete this turn or next.
It’s the only legal move and you’ve already checked the alternative.

“There was space” is not a reason.

Free moves first

Before you make any decision at all, scan the board for free moves — pours that cost nothing:

Pouring a colour onto a matching colour where the destination has room, and the source tube becomes empty or reveals something useful.
Merging two partial stacks of the same colour into one.
Completing a tube outright.

These strictly improve the position. Do all of them before you spend an empty tube on anything.

Count before you commit

Every colour has exactly four units in a standard level. This makes a lot of things checkable instead of guessable.

Before pouring, ask: where are the other units of this colour? If you’re moving two units of blue onto another two units of blue, that completes it and frees a tube — excellent. If you’re moving two blue onto one blue in a tube that also has three other colours buried underneath, you’ve just made that tube harder to unpack and gained nothing.

The general principle: pour towards the tube that already has the most of that colour, and prefer pours that will finish a colour completely.

Look one layer down

The colour on top is what you can move. The colour underneath is what you’re playing for.

Before any pour, look at what’s directly beneath the block you’re about to move. If uncovering it gives you a new legal move — especially one that completes a colour — that pour is worth far more than one that reveals a colour with nowhere to go.

This is the habit that separates “stuck” from “solved”: you’re not clearing the top, you’re choosing which second layer to expose next.

Recognising a dead end early

Levels don’t usually become unsolvable at the moment you notice. They become unsolvable about six moves earlier, when you spend your last empty tube.

The warning signs:

No empty tubes and no matching tops. This is checkmate. Undo back.
Every colour is split across three or more tubes. Fragmentation costs empties to fix, and you don’t have any.
Two tubes each capped with a different colour that the other one needs. This deadlock only breaks with an empty tube, so if you don’t have one, stop and rewind.

The right response to any of these is to undo several moves, not one. The mistake is rarely the last move — it’s the pour into the empty tube three moves back.

A working order of operations

Put together, a reliable turn looks like this:

Complete anything completable. Take the win immediately.
Take every free merge that doesn’t bury a colour.
Empty any tube you can fully drain, gaining a new empty.
Only then consider spending an empty tube, and only for a specific gain you can name.
Before each pour, check what’s underneath the block you’re moving.

On extra tubes and hints

Most versions offer an extra tube as a rescue. It works, and there’s no shame in it — but it’s worth undoing back to your last empty tube instead, at least sometimes, because that’s where you learn what the actual error was. A hint solves this level. Understanding why you got stuck solves the next thirty.

Water Sort is one of the games in Bits: Offline Games No WiFi, alongside Parking Jam, Block Fill, Connect and the rest — all fully playable with no connection, no account, and no progress stored on anyone’s server.