Bubble Sorting

Bubble Sorting is a tube puzzle with coloured bubbles in place of liquid. The aim is to move bubbles between tubes until every tube contains a single colour.

Its one firm rule is that two bubbles of different colours can never be placed directly next to each other. That rule is what you have to plan around, and the developer leaves it to you to find your own route to a sorted board. You get five chances on each level to change your mind: use one and the bubble goes back to where it came from. There is also a difficulty setting, and the developer encourages you to adjust it until you find a mode that suits you. The game is laid out for a tall portrait screen, and the instructions cover both mouse and touch.

Click or tap a bubble to select it. Then click or tap the tube you want to drop it into. A bubble cannot be placed directly beside a different colour. Carry on until each tube holds one colour. If you regret a move, you have five reversals per level to send a bubble back.

Five reversals per level is a limited allowance, so think a move through before making it rather than relying on the undo. Use the difficulty setting if a level feels too hard or too easy. Because mixed colours may never touch, look for tubes where the top bubble already matches the one you are holding.

A bubble and tube sorting puzzle with a strict no-mixing rule. The tubes stand in a portrait frame. Input is a tap or a left mouse click. There are adjustable difficulty settings and five move reversals per level; no level count is given.

Fun Water Sorting also has you click a bubble and drop it into a tube, with a hint and an undo. Kitchen Sorting lets ingredients land only on their own kind or in an empty jar.