There are various ways of cutting the joints of jigsaw pieces. Mainstream puzzles use a piece-edge style called fully interlocking. "Comprehensive interlocking" means that several adjacent pieces are connected together. If one of them is moved horizontally, all the connected pieces will slide in the same direction, and will not be discrete. Sometimes the pieces fit together so tightly that the whole piece can be picked up without unravelling.
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Key Features
There are various ways of cutting the joints of jigsaw pieces. Mainstream puzzles use a piece-edge style called fully interlocking. "Comprehensive interlocking" means that several adjacent pieces are connected together. If one of them is moved horizontally, all the connected pieces will slide in the same direction, and will not be discrete. Sometimes the pieces fit together so tightly that the whole piece can be picked up without unravelling.