About Marble Tube Sort
Marble Tube Sort swaps liquid for shiny glass marbles and turns colour sorting into a tidy, tactile little game. Clear acrylic tubes stand on a gleaming white rack, each one stuffed with a jumble of glossy marbles in candy red, ocean blue, mint, gold, violet and more. Tap a tube and its top marble pops up and hovers above the rim, bobbing gently while you decide. Tap another tube and the marble arcs across, drops inside and settles with a crisp clack. Only one marble moves at a time, and it may only land on a marble of the same colour or in an empty tube, with four marbles to a tube. Group each colour together and the finished tube flashes with sparkles. Sixty levels ramp from a two-colour warm-up to eleven colours, and every one of them has been proven solvable by a search algorithm before release. Fewer moves earn more stars, three free undos per level save you from a careless drop, and a spare tube can be added once per level when the shelf gets crowded. Relaxing enough for kids, deep enough for puzzle fans, and smooth on phone, tablet and desktop alike.
How to play
Tap a tube to lift its top marble, then tap another tube to drop it in. A marble can only land on the same colour or in an empty tube. Fill every tube with one colour. Undo (Z), restart (R) and +1 tube (T) are at the bottom.
Controls
| Click / Tap | Select |
| Arrow keysSpace | Move |
Difficulty: ★★☆☆☆ · Released: 2026-10-07