Ball Sort Puzzle Color Tubes

Tap a tube to lift its top ball, tap another to pour it in. A ball only moves onto an
empty tube or onto a ball of its own colour. Keep going until every tube holds four of one colour
and nothing else — that is one ball sort solved.

That is the entire rule set, and it is learned in about four seconds. What makes it a puzzle is
everything the rule stops you doing: the ball you need is almost always buried under one you have
nowhere to put, and the empty tube you were saving is the one you just filled.

FIVE HUNDRED LEVELS THAT ALWAYS HAVE AN ANSWER
Every board is built backwards from a finished one. The game starts from a solved set of tubes and
takes it apart using only moves that are legal in reverse, so the path back is still there when you
sit down to sort it. No board in this game can trap you, and no level needs a restart because it was
never winnable.

Difficulty grows the honest way — three colours at the start, up to eleven later, and the spare
tubes you lean on get taken away a band at a time. Each level carries a par, and finishing at or
under it earns three stars.

A CLEAN BOARD TO LOOK AT
A sorting puzzle is only as good as what you can read at a glance.
Tubes are drawn as open frames, so the stack is readable at a glance instead of hidden behind
glass. The ball colours were chosen to stay apart for colour-blind players rather than only to look
nice, and the board moves to five different rooms as you climb: Studio, Sunset, Forest, Candy and
Midnight.

TWO HELPERS, NO WALLS
Undo takes back your last pour. Add Tube drops one more empty tube on the shelf when a board has
closed in on you. You start with five of each and buy more with coins you earn by playing — there
is no life meter, no timer between attempts, and nothing stops you retrying a level immediately.

PLAY IT ANYWHERE
There is no clock running. Sort one tube on a bus or clear thirty levels on the sofa; the game
saves after every move. It runs fully offline, has no account to make, and collects nothing about
you. Every ball, room and sound in this puzzle is generated by the game
in code, which keeps the download small and the frame rate steady on older phones.