Shadoku

Bend the light. Match the shadows. Shadoku is a shadow puzzle in a daylit white room. A light shines at each of two walls, and everything you place in the corner casts a shadow on both. Drop blocks and Tetris pieces until the shadows match both dark target outlines exactly, with no shadow outside an outline and no gap inside one. PIECES REST ON WHAT IS UNDER THEM A piece drops like Tetris onto the highest cube beneath it, so overhangs leave gaps and light passes through them. A shadow can have a window. Every drop changes two pictures at once. 200 PUZZLES Start with single cubes, then meet the O and I, the T, L and J, and the S and Z on a bigger floor. Along the way come stone furniture you can't pick up, a spare piece that doesn't belong in the answer, and colored glass. GLASS THAT MIXES LIGHT Cyan, magenta and yellow glass tint the light instead of blocking it. Colors multiply where…