Liquid Sort Puzzles: Solving Techniques That Actually Work
Why liquid sort puzzles feel easy until they don’t
Liquid sort puzzles have one of the simplest rule sets in casual gaming. You have tubes, each tube holds a few layers of colored liquid, and you can pour the top color onto a matching color or into an empty tube. Sort everything and you win.
The first few levels of any liquid sort game, including our own Color Pour, can be solved on instinct. Then the color count creeps up, the board gets crowded, and suddenly you’re three pours from the end with nowhere to put anything. That’s the point where technique matters.
This guide covers the habits we rely on when we solve our own levels. They apply to almost any liquid sort game, but the examples use Color Pour’s rules: four layers per tube, the whole same-color block on top pours at once, and it pours as much as fits.
Technique 1: Treat empty tubes like money
An empty tube is the only place that accepts any color. Every other destination is conditional: it needs a matching color on top and free space. That makes empty tubes the most flexible resource on the board, and the one players waste most often.
The classic mistake is pouring something into an empty tube just because it’s a legal move. Now that tube is committed to that color until you empty it again. Do that twice early in a level and you’ve spent your whole budget before the hard part.
A useful rule: only pour into an empty tube when you have a plan for that color. Either you can see where the rest of that color is and can reach it soon, or the pour uncovers something you need right now. If neither is true, look for a matching pour instead.
The flip side is just as important. Emptying a tube is like earning money. If a tube has only one or two layers left, clearing it out often beats finishing a color, because you get your flexibility back.
Technique 2: Pour onto matches before you pour into empties
When a layer can go onto a matching color, that move is essentially free. It doesn’t consume an empty tube, and it groups colors that need to end up together anyway.
Before every move, scan the tops of all tubes. If two tubes have the same color on top and one has room, that pour is almost always safe. There are exceptions (more on burying below), but as a default it keeps your empties open longer.
In Color Pour this matters even more because the whole block of matching color moves together. Pouring two reds onto a red can turn a scattered color into a nearly complete one in a single move.
Technique 3: Count layers before you commit
Every color has exactly four layers in Color Pour. That sounds obvious, but it’s the most useful fact in the game.
Before you start collecting a color in a tube, find all four of its layers. For each one, note how many layers sit on top of it. Add those up and you have a rough “dig cost” for that color. Start with the color that has the lowest dig cost, because it’s the one you can actually finish.
For example, suppose green’s layers are: one on top of tube A, one on top of tube B, one second-from-top in tube C, and one at the very bottom of full tube D. The first three are cheap. The last one needs three pours just to expose it. Green is a good color to gather, but you shouldn’t plan to finish it until you’ve got a plan for tube D.
Counting also tells you when a tube is a trap. If a tube has the only copy of three different colors stacked on top of each other, whichever is at the bottom will be the last color you complete.
Technique 4: Don’t bury what you’ll need next
Every pour covers something. Before you pour blue into a tube, look at what’s currently on top of that tube. If it’s the last accessible layer of yellow, and yellow is what you’re working on, you’ve just put a lid on your own plan.
A good habit is to ask two questions before each pour:
- What does this pour uncover in the source tube?
- What does this pour cover in the target tube?
A move that uncovers something useful and covers nothing important is great. A move that uncovers nothing and covers something you need is the one to avoid, even if it’s legal and tidy-looking.
Technique 5: Work backward from one finished tube
When the board is crowded, pick a single color and plan its completion from the end. Where will its four layers finish? Usually that’s a tube that already has one or two of that color at the bottom, or an empty tube. Then work out what has to move out of the way, and where each of those layers can go.
This is basically how solving programs approach the puzzle, just with less patience. A computer searches every move. You can search just the moves that serve one goal, which is far more manageable.
Technique 6: Recognize a dead end early
A liquid sort position becomes unsolvable when every tube is full or blocked and no pour frees up space. Before that happens, there’s usually a warning sign: you have no empty tubes, and every legal pour just moves a layer back and forth between the same two tubes.
If you notice yourself shuffling one color between two tubes, stop. That loop isn’t progress. It’s time to undo, use a helper, or restart.
Color Pour checks positions for you. After each pour it runs a quick search, and if it can prove the level can no longer be solved, it tells you and says whether an extra tube would rescue things. It’s a safety net, not a hint system: it won’t tell you the right move, only that you’ve missed it.
Technique 7: When to use undo
Color Pour gives you three undos per level, and each one still counts as a move. With a limit like that, undo is best used for:
- Misclicks. If you tapped the wrong tube, undo immediately.
- Pours you regret at once. If you see right after pouring that you just covered your last accessible layer of a color, undo before you make it worse.
- Backing out of a dead end when the game tells you the position is stuck.
What undo is bad for is exploring. If you pour, look around, undo, pour somewhere else, and undo again, you’ll burn through all three before the level gets hard. Try to do that exploration in your head instead: “If I pour A into C, then B’s top is red, and red can go onto D.” Two moves of lookahead is enough for most levels.
Technique 8: Save the extra tube for the endgame
Color Pour lets you add one extra empty tube per level. It’s tempting to use it immediately on a big level, but it’s much stronger late. In the endgame, a single stuck color is often all that stands between you and the win, and one empty tube is exactly what you need to lift it out. Used on move one, the same tube tends to fill up with clutter like the others.
A short checklist
When you’re stuck, run through this:
- How many empty tubes do I have, and am I about to fill one without a plan?
- Is there a matching pour I haven’t made?
- Which color has the lowest dig cost?
- What will my next pour bury?
- Am I shuffling the same layers back and forth?
Liquid sort puzzles reward patience more than speed. There’s no timer in Color Pour, so take a moment before each pour, especially in the late levels with ten or more colors. The difference between a smooth solve and a restart is usually one careless pour into an empty tube.
