Jigsaw puzzles consist of an assembly of small tiles which are designed to be fitted together in order to create an image or structure. Flat jigsaw puzzles usually turn into replicas of photographs or paintings when they are completed, and three dimensional jigsaw puzzles can be used to create replicas of famous buildings, boxes, or unusual shapes. The jigsaw puzzles can be made more challenging with large numbers of unusually shaped pieces, or less difficult with fewer, larger pieces. In addition to serving as educational tools for children, jigsaw puzzles are also very popular with adults.
The majority of modern jigsaw puzzles are made with interlocking puzzle[puzzle?:jigsaw puzzle] pieces. This pieces have knobs which can snap into corresponding holes of jigsaw puzzles, ensuring that a solved portion of the jigsaw puzzle[jigsaw puzzle?:Jigsaw puzzle cutting machine] stays together. Some jigsaw puzzles also incorporate pieces with smooth edges, or pieces in strange shapes like starbursts which fit together with other unusual shapes to create a complete jigsaw puzzle. Jigsaw puzzles can be made in any shape, and are sometimes also printed on both sides, to make solving them more challenging.
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