Tube Sort
Tube Sort is a calm, clever puzzle where you pour colored balls between tubes until every tube holds just one color. There's no timer pushing you, just clean logic and a satisfying series of pours as the colors click into place.
With 1000 levels to work through, the puzzles slowly grow trickier, adding mystery balls hidden under question marks or trickier tube setups with only one spare tube to work with. If you get stuck, tools like an extra tube or undo help you keep thinking instead of restarting from scratch.
You can play Tube Sort online for free, no download required, right in your browser on phone, tablet or computer.
How to play Tube Sort
- Tap a tube to pick it up, then tap another tube to pour
- The top color pours across onto a matching color or an empty tube
- Keep pouring until every tube contains only one color
- Use undo if a pour doesn't go the way you planned
- Use +TUBE for an extra spare tube if you get stuck
- Restart anytime for a fresh start on the level
Controls
- Tap: Tap a tube, then another to pour the top color across
- 1–0 keys: Pick a tube directly (desktop)
- U key: Undo the last move
- R key: Restart the level
Features
- 1000 levels that gradually introduce new challenges
- Mystery balls hidden under a question mark until you clear the top
- Levels with only one spare tube for a tighter puzzle
- Undo and +TUBE tools to help when you're stuck
- Works on phone, tablet or computer with no download
Tips
- Think ahead before pouring: a move that looks helpful can block your next one
- Save your spare tube for when you really need a place to stash a color
- When mystery balls appear, clear the top layer first to see what's hidden underneath
- If a level feels like a dead end, use undo or restart instead of forcing more moves
FAQ
Is Tube Sort free to play?
Yes, Tube Sort is completely free to play on Playnaut.
Do I need to download anything?
No download is needed. Tube Sort runs directly in your browser, and it's also available as an Android app.
Can I play Tube Sort on my phone?
Yes, it works smoothly on phone, tablet or computer thanks to simple tap controls.
How many levels does Tube Sort have?
There are 1000 levels, starting simple and gradually adding new twists like mystery balls and fewer spare tubes.
What do I do if I get stuck on a level?
You can use undo to take back a move, restart for a fresh start, or use the +TUBE tool for extra space to work with.
Is there a time limit on levels?
No, Tube Sort is a calm puzzle game with no timer, so you can take your time and think ahead.