Types of Spatial Puzzles: Fold, Turn, Pack, Cut, Tile and Flip
Folding, rotating, packing, cutting, tiling, and mirror and shadow puzzles: the six types of spatial puzzles, with worked examples and riddles to try.
Riddle10 blog
Articles about tiling
Packing Puzzles: The 70 Square and the Thirty Colour Cubes
Why 24 squares cannot tile a 70 square, how a shorter proof is being built from the edges, and how 30 painted cubes copy each other.