Park gems whose color isn’t open yet — this is required to clear levels
Prism Mosaic
Reveal jewel pictures one gem at a time. Only the glowing edge of the mosaic is open — place matching colors to unlock the inside.
Why the holding shelf exists: gems come from a shuffled bag. If the current color has no open (glowing) tiles yet, park it on the shelf. Tap a parked gem later when its tiles unlock. If the shelf fills and you still can’t place anything, the level jams — plan which colors to park.