List of impossible puzzles

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This is a list of puzzles which have been proven impossible. An impossible puzzle is a puzzle that cannot be solved by following the directions or criteria for that puzzle.

• Mutilated chessboard problem
• Some variations of Fifteen puzzle
• Three-colouring the edges of the Petersen graph
• Seven Bridges of Königsberg
• Water, gas, and electricity
• Three cups problem

See also

• Impossible Puzzle
• -gry