Spectrum

1. Each tube holds 4 layers.
2. You can pour onto an empty tube or onto the same color on top.
3. The whole top run of a color moves, as much as fits in the target.
4. You win when every tube is empty or full of a single color.
5. Expert levels may have a move limit.

1. Pick a tube. Tap a tube to lift it. The color on top is what you will pour.
2. Pour on the same color. Pour onto the same color or into an empty tube. The whole run of that color moves.

• Click or tap a tube, then the tube to pour into
• Arrow keys move between tubes, Enter or Space picks and pours, Esc cancels
• Z to undo, Y to redo, H for a hint

Easy levels use 3 to 4 colors, medium 5 to 7, hard 8 to 10 and expert 11 to 12, some with a move limit. Each level is proven winnable by a solver before you see it.

Is Spectrum free to play?

Yes. Spectrum is free in the browser with no account needed, no download and no ads. Your progress is saved on your device.

How do you play Spectrum?

Each tube holds 4 layers. You can pour onto an empty tube or onto the same color on top. The whole top run of a color moves, as much as fits in the target. You win when every tube is empty or full of a single color. Expert levels may have a move limit.

How do the levels and difficulty work in Spectrum?

Easy levels use 3 to 4 colors, medium 5 to 7, hard 8 to 10 and expert 11 to 12, some with a move limit. Each level is proven winnable by a solver before you see it.

Can I play Spectrum on my phone or tablet?

Yes. Spectrum works in any modern browser on phones, tablets and computers, with touch, mouse and keyboard controls.

Is there a daily Spectrum puzzle?

Yes. Every day there is a new daily puzzle, the same for every player, alongside unlimited numbered levels.