Controls

You play by moving the top ball of a tube. Tap a tube to lift its top ball, or click it with a mouse on a laptop, then tap or click the tube where you want it to go.

A move is only allowed under certain conditions:

• Where a ball can land is on top of a ball of the same color, or in a completely empty tube. You cannot drop a ball onto a different color.
• Only the top ball moves so you always work from the top of each stack. To reach a buried ball, you first have to clear the ones sitting above it.

You solve a level when every tube holds one full color or sits empty. Undo backs up your last move if it didn't help.

The puzzles get harder across eight levels as more colors join the mix. Stuck with nowhere to move a ball? Watching a short ad through the +Tube button adds an empty tube to work with.

Tips

• Keep an empty tube in reserve. An empty tube accepts any color and is your main tool for untangling stacks, so avoid filling your last one unless you have a clear plan for it.
• Stack matching colors together first. Combining balls of the same color from different tubes into one frees up space and moves you closer to a finished tube, so prioritize these merges.
• Uncover the colors you need. Because only the top ball moves, a ball you need can be buried. Look for moves that peel away the balls sitting on top of it.
• Plan before moving a rare color. If only a few balls of a color remain scattered, make sure you have somewhere to gather them before you start, or you may strand one on top of the wrong stack.
• Finish one color completely when you can. Filling a tube with a single color and setting it aside cuts down the clutter you are tracking and often reveals the next move.
• Undo and rethink instead of forcing moves. Every level has a solution, so if you hit a wall, an earlier move was the misstep. Backing up and trying a different order will get you unstuck.

Frequently asked questions