Number Tubes

Ball Sort, Color Sort, Number & Letter Sort · Updated Apr 2, 2026

About Number Tubes

When the last ball snaps into place and every tube runs a single solid number, the screen reads like a clean ledger. Number Tubes trades colour sorting for a number-merging twist: tap a ball — or a matching chain — onto another tube, and identical numbers fuse into the next value. The real payoff comes when a cascade collapses three tubes into one and a 64 appears where four 8s stood a moment ago. Each level resolves as a neat arithmetic table, and the only pressure is the one you set chasing a higher score.

Number Tubes is a wonderfully relaxing yet brain-teasing puzzle. The simple act of tapping to sort colored balls into their matching tubes is deeply satisfying. The real strategy kicks in when you merge matching numbers to create bigger ones, carefully planning your moves to clear space and keep the chain going. It’s that perfect blend of simple sorting and strategic merging that makes it so hard to put down. No timers, just pure, focused fun for anyone who loves a good organizational challenge.

How to Play Number Tubes

Tap a ball to move it into another tube, or tap a chain of matching balls to move the whole chain together.
Merge two balls with the same number by placing one on top of the other — they combine into the next higher number.
Keep merging to free up space and create larger numbers, aiming to clear tubes entirely.
Plan your moves so you don't trap a needed number under a mismatched ball.
Continue merging until you reach the highest possible number and set a new record.

Game Features

Merge mechanic: identical numbers fuse into the next value, collapsing two balls into one on contact.
Chain selection: tap any matching consecutive run of balls to move the entire stack in one action.
Number progression advances through powers of two — 2, 4, 8, 16, 32, 64, and beyond.
Tube-based grid: each tube holds a vertical stack, and you can only move balls from the top of a stack.
Record-based goal: there is no fixed level limit — keep playing to push your highest number.

Tips & Strategies

Always merge the smallest available number pair first — it keeps the board open and prevents a low number from getting buried.
Before moving a chain, check whether splitting it would leave a stray ball that blocks a merge on its current tube.
When two tubes each hold half of a merge pair, move the whole smaller stack onto the larger one rather than moving balls one by one.

Frequently Asked Questions

What happens if I put a ball of a different number onto a ball I wanted to merge?

The ball sits on top and blocks that tube until you move it off. You cannot merge through a mismatched ball — you must clear the blocker first.

Can I move more than one ball at a time?

Yes. Tap the top ball of a consecutive matching chain — all balls of that same number in that stack move together to the target tube.

What counts as a 'record' in Number Tubes?

The game tracks the highest single number you have ever created by merging. Each session continues until no further merges are possible, and your best number stays saved.