A hidden shape casts three shadows. Rebuild something that casts all three — that is the whole game. It is also, quietly, the exact skill an instruction booklet demands: reading a solid object from flat pictures of it.
The three shadows
Front
Side
Top
Solid is matched, outlined is still missing, red is a shadow you are casting that the shape does not.
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bricks used · par –
Build it, one layer at a time
Looking down from above. Faint squares are allowed by the top shadow; dots show the layer below.