How many levels are there?

The game has 100 levels, starting simple and growing more complex as you progress. Your level progress is saved automatically.

Is every level solvable?

Yes. Every puzzle is generated using a reverse-shuffling algorithm from a solved state, guaranteeing that a valid solution exists.

How does scoring work?

Your score is 10000 minus 10 points for each move used. Solving in fewer moves gives a higher score.

Can I replay earlier levels?

Yes. You can go back to any previously completed level and play it again to try for a better score.

How many colors are in the game?

The game has up to 14 possible colors. Earlier levels use fewer colors, and later levels introduce more to increase the challenge.

Test Tube Sort

Pick up where you left off

Continue your progress, start fresh or challenge yourself.

No saved game

NEW GAME

Start a fresh game

Jump right into a new game session.

All progress is saved automatically

You can continue anytime from this device.

How to Play Test Tube Sort

Objective

Sort the colored liquids so that each test tube contains only one color.

Controls

Tap a tube to select it, then tap another tube to pour the top color from the first tube into the second. The liquid can only be poured into an empty tube or onto matching color.

Step by Step

1Look at the test tubes. Each contains layers of different colored liquids.
2Tap a tube to select it (the source).
3Tap another tube to pour the top layer of liquid from the source into the destination.
4Liquid can only pour into an empty tube or onto the same color. Each tube holds a maximum of 4 layers.
5Continue pouring until every tube contains only one color.

Winning

The puzzle is solved when each test tube that contains liquid holds only one color — all layers in the tube are the same.

Test Tube Sort Rules

You can only pour liquid onto the same color or into an empty tube.
Each tube can hold a maximum of 4 layers of liquid.
When pouring, all contiguous same-colored layers at the top move together.
The game provides extra empty tubes to facilitate sorting.
Each puzzle is guaranteed to be solvable.

Tips & Strategies

1.Keep at least one empty tube available at all times. Losing your last empty tube can trap you in an unsolvable position.

2.Focus on completing one color at a time. Getting a tube to all-one-color early frees up space for further sorting.

3.Look at the bottom layers. If a tube has the same color on the bottom as another tube's bottom, plan to merge them eventually.

4.Avoid mixing more colors than necessary. Each pour that creates a new mixed tube makes the puzzle harder to unwind.

5.On later levels, count how many tubes contain each color and plan the merging sequence before you start pouring.

About Test Tube Sort

Test Tube Sort is a color sorting puzzle with 100 levels of increasing complexity. Early levels feature fewer colors and more empty tubes, while later levels pack in more colors with tighter constraints. The game uses deterministic puzzle generation so each level is identical every time you play it. Scoring awards higher points for solving with fewer moves. Level progress is saved automatically, and you can revisit completed levels to improve your score.

Frequently Asked Questions

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