Flasks: Potion Sort

A handful of flasks, each holding layers of mixed colours. The goal is to pour until every flask holds a single colour.

You may pour only onto the same colour or into an empty flask, and matching top layers move together. All the difficulty grows from those two rules: one wrong pour locks the colour you need under someone else's, and the level stalls.

Levels are derived from their number and never run out. Difficulty grows in tiers: more colours first, then deeper flasks, then no spare flasks at all, so you have to make room yourself.

Undo takes a move back, a hint shows the next pour, and in a dead end you can take an empty flask. Stars are for a short solution, XP adds up to your player level.