How to play

Drop pieces into the corner of the room. Each piece casts a shadow straight onto the back wall and the left wall.

• Fill both outlines. Make each wall's shadow match its dark outline exactly. An outline turns green when its wall matches.
• Aim and drop. Tap the floor to aim the piece in hand; its ghost shows where it will land. Tap the ghost to drop it.
• Turn a piece with ↻, or tap it in the tray again.
• Pieces fall. They rest on whatever is under them, so an overhang leaves a gap, and the shadow gets a window.
• Take one back: hold a placed piece to pick it up, or use Undo.
• The two small panels show each wall flat, with its outline and the shadow so far.

★ Solve the level. ★★ Solve it without a hint.

Grey stone is furniture: it stays put, and pieces can rest on it. Some levels give you a spare piece: solve it and leave that one in the tray.

Glass tints the light that passes through it. Two colors on the same ray mix: cyan + yellow makes green, magenta + yellow red, cyan + magenta blue, and all three make shadow. A small square in a wall cell shows the color it needs. Turn on Color patterns in Profile to tell the colors apart by pattern.

A new level every day, the same for everyone. It's timed, with no hints: solve it to see your time and how it compares with other players, and share it. Solve it on days in a row for a streak.