The player must sort colorful slimes into test tubes. Each tube holds up to four slimes of the same color. You can only move the top slime into an empty tube or onto a slime of the same color. Tap a tube to select it then tap another tube to move the slime. The level goal is to fill all tubes completely with a single color each. The number of colors increases with each new level. After winning you will see a celebratory confetti burst and can advance further. Great puzzle game for logic and move planning.