Unsolved Sudoku List

Generated by www.sudoku.uk.com

This is a list of extremely hard Sudoku puzzles which cannot be solved using the following techniques:

Puzz IdPuzzle String
2694....2.8.8.3.9.......5....3.4.8...5.3..7.9..8.2...4.9.6....7.......8.6.5.8.4....2
2941....6....6.9....88....436...8...4....6.439.5.4.5......2.....7.4.1.7......3.1.2..
303....5.63..36.2..159.56..82.....8.54.51.246.9...4.9.....57..92.3.8..7245...2....7.
310.3.....5...96..8..1.29..3....1.64....7.......8.....67.4.5..2..37....5..1.9..7....
31396...53.4.1.7....68...6...21...76423.264.19.747....6..6...172457..6.2.3.2.18..769
3168.......6......15...69..2..3...1...4..9.6.7..2...7...3..3..14...45....8.6.......9
322.65..9...48.6.........2...3.....37..5...4...8..17.....9...7.........4.92...3..61.
32584...1.969.5.8.....7.....2....1.......1.5.9.......2....6.....8.....9.3.14..3...67
34438.6.......9.......2..3.51......5....3..1..6....4......17.5..8.......9.......7.32
3601....7.9..3..2...8..96..5....53..9...1..8...26....4...3......1..4......7..7...3..
3968...7..466734.58...41.6.5374.6...2..18..4..65..7...4..764521398..87346..3...8...4
409.6.......3.9..5....452.9..797..2....6..5.1..9....8..127..6.215....4..9.3.......6.
432..72.83..4..5.71.8..8.6....62.8..794.......8398.....51....8....8.91.2..6..54.68..
447.2..4.....98.5.3.2..4..8.....13....4.45...71.7....59.....5..2..4.9.7.16.....9..3.
4637.....4....69..8.......3.7.5.....2...4..8..1...76....9.8.4.......1..25....9.....3
491561.4..9.723...45.8495..2..13.7.564947.196.3.69...4..7257..39..914...365386.5....
499..1...6...8.2.3.5..2..5...7.38....4....8.6....9....2......3..7..5.7.1.8...3...4..
536..2.1....4...8..26..5.7.1..9..135..2.6..2..7.2..746..3.29.5.3..18..6...7....9.2..
544.7.......3..7.8..45...9..73.48...23.2...4...5.15...74.82..1...64..9.3..7.......2.
563.816...9............4.376..6..4..5...3.....7...7..2..4..521.3............7...481.
645...4.61.....3.7....67...49.7.3...6.55...4...16.4...8.9.31...58....8.4.....65.1...
646...6..4..7....36......91.8...........5.18...3...3.6.45.4.2...6.9.3.......2....1..
6607.....9814.9.2.36..38...24.57.1948.69......5.8..6.5..9.84...67...7.8.59.295.....8
6617......81..9.2.3...38...24.5..1.4..6.........8..6.5..9.84...67...7.8.5..29......8
6699.5.1.3...18...9257.3....14...295......347......861...8.....243.97...168..4.8.5..
6725.9.7.3..2..5.9..7.7..4.9..137...546954163278826.5.193....2....7.28.5..1.85...729
679...2..81.......9...6....4.3.4..8.....75.9.1..6......7.2..6.....7..8.13......4...5
685.........67.8....34....7.51.4.1.2.9...7...1...1.4.5.7.28.3....97....1.26.........
6868312475..9..5.63.456439...22.91.3.4.38672495114.8.92.37..4.263.4.367...56..9354.7
6985.92....886.5...21......5..748652.1.195743...236981457.57......68...5.749....76.5
7018..23..45....6.7.84..1.82.39536214877128459366847935211.69.2..4..8.1...95493.6..2
704.3.657..1.2......65......3.4..9.1.7.....8....3..2.4.9..4......7.6.125..41......6.
705..843956.356.7.9.4.49.56.384.356..8959.38..4.86..943.591.64385..35.1.49..84925..3
7073..45.6.1651.873.4.941637.5.3564.17.469718532.1..3546.5438269179865712431..394856
7156.......7.8..21.9.5.9...2....49.5.....7.1.3.....3.74....1...7.3.2.79..1.4.......8
732..2...19.973.1.28..16.9.7..19.53.86.6..9.13.7.3..4691....17.6...61...57.789...4.1
733..2...19..73...28.....9.....9.53..6.6..9.1..7.3..46.1.....7.....61...57..89...4..
734.......5..27...3.4.5...3197..12.4...47.....28...8.97..5463...1.7.3...56..9.......
737..97...1...83...5...48...2.2...5...839.....758...9...6.6...87...8...49...1...25..
739..1....2.9..4.5...6......7...4.2.1....5.7.9....3.6.8...8......6...9.3..4.1....2..
740..3..8...9......4.2....5.6...7.9.3....6.4.5....9.1.2...5.7....9.8......1...3..4..
8191.......2.9.4...5...6...7...5.3.4......96.........8.4...2...6...3...9.8.7.......1
821...7.9.....1.2.3...2.3.1.5.1.4...9.2.5.....7.9.8...1.5.9.6.5.3...2.7.5.....8.2...
823..9....5...42.8.....3....46....3..297...1...835..4....18....9.....5.63...3....7..
82489..1..377..8.2......6.......9....65.5.....1.18....7.......5......4.3..994..7..58
825.7.6....336..8......9..3.5....3..4.5.2.....8.9.7..4....9.5..1......2..478....1.6.
826.7.6....336..8......9..3.5....392475.2.1...8.9.78.4...79.5..1.....92..478....1.6.
827.4.1......62...14918..4....417826953325479618698513274.31...462254..1.97.762.45.1
830..1.8.6.4.376.....5.............5.....6.1.8.....4.............3.....752.8.2.9.7..
834...5.6.......4...1.1...2.57..72..8..6.5...3.2..4..35..26.1...3.4...2.......8.9...
835..26..94...5924.6.964...2..1.3.95.265974623182.61....9729586134631249..7458.1.692
836...4..196.619.8.25....1.78.1...5.84.62478153958..946...15829.6...65432..24.16795.
837..3...1...9651.48.....8..3....8.7..5.7.....2.5..2.1....4..9.....15.3687...7...5..
838.7......9...7..5...32.5..8...763..54....8....36..952...2..1.73...43.....1......9.
8391....7.9..3..2...8..96..5....53..9...1..8...26....4...3......1..41.....7..7...3..
84327..4.165...5...7..5...1.3..2781.6.3..9.5.2.1..1.327...9.4...16.6...5...8...6...7
8442...4...5...5...7..5...1.3...781.6....9.5.2....1.327...9.4...1..6...5...8...6...7
8462..5...9.6.....123..1........74.82...8.6.9.7...47.25........6..156.....2.2...5..8
84789.....12.......5.....6...3..3.548...5.1.6.9...497.5..3...9.....4.......27.....89
848.4.16.27.691.....427...4..19264.831.48..21.9.1.79.64287.4.1...2.1.....4.....4715.
850...85.169951637842..81.9735.9.5..41.81.9...56..5..1.9.546...921173296584289415673
851..8.3..2....7..5....3..4..7..7....6....526....4....9..7..9..2....6..5....1..8.7..
8522...1.7.5..12.........3.14.67..4...38..9....1....8..94.63.9.........6...1.5.7...6
853............7..5.865..32.412..1.34.6461..58..7..4.6..2826517394379.48..55143.9.87
8567.618.25952176984398...27164683275912.58.1...17.6.5.28612..89..85791...23..276185
8577.618.25952176984398...27164683275912.58.1...1..6.5.28612..89..85791...23..276185
858.9........4..1..6....573...5.......71...6...92.......8...238....6..9..1........3.
859...1...8.5.......3...4....7.6..7..5..8..9..1..1..2..4.7....6...2.......9.3...5...
860...943.....6.....8..5....1.98..........612..........47.1....9..3.....2.....578...
862....697...2..3..8...45...3.57.6...9........67.....3.1848...76...9.....4...134..7.
8638..7....5...123....2...5.6..3.....29.........45.....3..9.2...1..7.98....1....4..3
8642..1.94...8..43.....7.8....92.5.....6..8.2..18....4.25....2.8....29.8.7...84.12.3
8681.......2.9.4...5...6...7...5.9.3.......7.......85..4.7.....6...3...9.8...2.....1
869.2.7.3.65.58.9.327..32.5.9418..59..23.5.2.9...6..745.8.9.5..4.3....3725953.9.2.8.
87068.7.1.9.5.96..1...71..9.6..1..6524..5.243.16246.1..5..9.1.6.8.1.5...6.9.6...2.31
871428.5..791739485266..27....7.....4.354.....673.64.7.52...719...9.78.4.......6.79.
8733..829.1...8....2..215.34.88....5.3.215.3..49.732...51..9.51.8....9821..1823.4..5
8743978..214461...785..5..1963..2.8....53.91742...9.2.3....31..8..9......42.54..8.3.
875.......6.7.23.1.......5.9..........1.5..4..8.3..........8.9.......7.28.3.4.......
876.6......8..139.......2......5...6.........2........19.9.2........3..4......7....5
878.....5.237...1..9..6...71...8.73...1..1...3..3...59.7...26...1..3..4...761.9.....
880.425.6..96.93......3...9...87.43529.49......3...69..84...96..5.96..5.1.85..1.396.
8818312....7..9..8..1..51.789..5.924.181928..57448.71592..14...7.59....1...5.847.139
882.3.2....7..9..8..1...1.789..5..24...1.28..5...8.7...2..14...7.59....1...5...7..39
886914673..87....593.5..29.76.1.7....92.9.7...4.2..9..817.71.49..34.9...17....1.7489
887.....96...56...........387.1...6...4..45.72..9...4...5.891...........14...18.....
8892..45.169.46.918.2.912684....2.74.814...1..23.1.82.5..124.8639....94.2188.9132...
890...58.4394.8.....195.64.8728751263943.4.5...729.374..8...46..8554......668.715.43
891....8....2.....7...84.75....2...48..........68..9.34.5..5.....23......9..6.217...
892....8..3.4.......195..4........26.943.......729.37........6..8554......6.8.71....
893..5.4.6.....3...2..1...8..7..6....15....2.....9.7..3..8..6......3...1..9....5.7.4