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Tower of hanoiDissection puzzleMasyuBorromean ringsSlitherlinkBlock-stacking problem15 puzzleCombination puzzleNurikabeSum and product puzzleAges of three children puzzleBalanceTangramKakuroConnect the dotsFutoshikiLattice multiplicationSudokuJigsaw puzzleSliding puzzlePrinter's devilryPenrose triangleAlphameticFibonacci spiralNonogramWheat and chessboard problemBanach-tarski paradoxMonty hall problemBalance puzzleSuperflipTwo envelopes problemCrossed ladders problemTarski's circle-squaring problemSpiral of theodorusAlhazen's problemPlate trickChess problemPascal's pyramidPretzel linkBridge and torch problemMetapuzzleProblem of apolloniusGoldbach's weak conjectureAnt on a rubber ropeReidemeister moveUlam spiralAdele ringGod's numberImpossible objectSmallest-circle problemKanizsa triangleTower of london testEuclidean shortest pathPentagramYablo's paradoxUnique factorization ringDesargues configurationTetractysHolyhedronSierpinski triangleTiling puzzleTangential quadrilateralArchimedean spiralCircle of apolloniusGauss circle problemPentagonal numberArtinian ringApollonian gasketQuadrature of the circleTissot's indicatrixPermutation graphMagic cubeMalfatti circlesPascal's triangleEdge-matching puzzleEight queens puzzleTeletransportation paradoxHasse principleQuincunxPatienceBongard problemBell triangleHopf fibrationSquaring the circleRiver crossing puzzleTribonacciLemoine hexagonSierpinski carpetPigpen cipherCrosswordRoute inspection problemPicrossTruncated cubeFridrich methodRhombohedronDedekind cutDiophantine geometryGeomagic squareReuleaux triangleFeistel cipher