Snug Sort is a ball-sort puzzle for short breaks. Each tube holds four balls. Pour matching colours onto each other, use the empty tubes to make room, and finish when every tube holds a single colour.
The first levels teach the idea in seconds. After that the boards grow and the spare space shrinks. Every few levels a Tight squeeze gives you just one empty tube, and you have to think a few moves ahead.
Stuck? Undo a move, or watch a short ad for a hint or an extra tube. The game is free and supported by ads.