Shadow Sculptor

Controls

• Choose a piece and press Put in; it enters at the first free spot.
• Move it with the x, y, up and down buttons — or with the arrow keys and Page Up/Page Down while the controls have focus — and rotate it with Rotate X, Y or Z (or the X, Y, Z keys).
• The workspace is shown as four layers, so nothing is hidden behind anything else. Undo and Reset are always available.

The rules

• Pieces are rigid: they move a whole cell at a time and rotate by quarter turns. A move that would overlap another piece or leave the space is refused completely.
• Each shadow lights a cell when any block lies anywhere along that line of sight.
• Solved when every piece is placed and all three shadows match their targets exactly — no particular arrangement is required.

Scoring, saving and limits

Each panel lists missing and extra shadow cells exactly, rather than a percentage that could hide which ones are wrong.

Your piece positions, undo history and solved puzzles are kept on this device only. Download a backup to move them.

Twelve original puzzles made by placing pieces in a known layout; a search confirms each has at least one solution. Shapes are not guaranteed to have only one.

Questions

Why does my arrangement count when it looks different from what I expected?

Different solids can cast identical shadows. If all three match and every piece is used, it is solved.

Where is the camera?

There isn't one — the shadows are straight projections, so they never depend on a viewing angle.

Why was my move refused?

It would have pushed part of the piece outside the space or into another piece. The status line says which.