Did you know?...
Devil's Chess, also called 'Just Fit', was designed by William Strijbos and won the Hikimi Puzzle Competition in 1990 (competition for wooden made puzzles only in Japan).
All 16 pieces and tray are made of wood. Each piece of the puzzle has 2 colors and when the pieces are arranged in the wooden tray as shown in the picture, there are actually 2 layers of 4x4. The pieces are cut in different angles and this is the reason the puzzle is hard to solve. Consider being a very difficult puzzle.
The object of the puzzle
This one of a kind sixteen pieces wooden brain teaser puzzle represent all the possible ways that two pieces of 2 colors cut in different angels can be joined. The object is to assemble the pieces into a two-layer, 4x4 checkerboards with the colors matching on both layers and with the colors being different on both layers.