Silto: Sand Sort Puzzle

Sand does not mix here. Tip a glass jar over another one and the top layer slides across — but only onto its own color, or into a jar with room and nothing in it. The whole layer travels at once, which is what makes a pour worth thinking about before your finger lands. The goal is a shelf of jars where each one holds a single color, bottom to rim. Six hundred levels ask for exactly that, and every one of them was generated and then solved by the game itself before it was allowed to exist, so a way through is always in there, waiting to be found. The climb is gentle on purpose: lighter levels are woven between the hard ones so progress never turns into a wall. Match the par and the level gives back three stars; come later for the ones that got away. Once a day one more level arrives, and that one belongs to everybody: the day's puzzle is identical for every player on the planet. Solve…