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    The Connect Four hole will go live in approximately . Why not try and solve it ahead of time?

    Recent Solutions

    Hole Golfer Bytes Time Submitted
    Taxicab Numbers KasperKivimaeki 🥈 83
    Connect Four akaritakai 244
    ISBN akaritakai 139
    Rijndael S-box akaritakai 180
    ASCII Table aksyristos 140
    QR Decoder aksyristos 400
    Leap Years RealBen9 66
    Divisors RealBen9 85
    Calendar MostParsingVex 239
    Arabic to Roman Steffan153 💎 105
    Taxicab Numbers sean-niemann 85
    Partition Numbers kasarino 146
    Trinomial Triangle kasarino 188
    Sudoku KasperKivimaeki 🥉 394
    Sudoku (Fill-in) KasperKivimaeki 🥉 182
    Tongue-twisters KasperKivimaeki 340
    Sudoku (Fill-in) kcinnu 215
    √2 KasperKivimaeki 💎 106
    Leap Years sean-niemann 55
    Sudoku (Fill-in) snoozingnewt 314
    Sudoku (Fill-in) tomh1012 460
    Sudoku kasarino 1,885
    Sudoku (Fill-in) CornerMercury 1,943
    Factorial Factorisation akaritakai 132
    ROT13 akaritakai 103
    N Queens akaritakai 199
    Seven Segment akaritakai 217
    Hexdump akaritakai 268
    Sudoku (Fill-in) kasarino 1,356
    ASCII Table akaritakai 144
    Quine akaritakai 74
    12 Days of Christmas akaritakai 536
    π akaritakai 210
    Intersection akaritakai 195
    Gray Code Decoder akaritakai 82
    Reverse Polish Notation akaritakai 210
    Collatz KasperKivimaeki 🥇 65
    Catalan’s Constant KasperKivimaeki 💎 135
    Sudoku (Fill-in) bitsandbeyond 344
    Prime Numbers akaritakai 61
    Sudoku (Fill-in) BREMAUCY 2,172
    Sudoku BREMAUCY 2,144
    Tower of Hanoi retrohun 87
    Sudoku (Fill-in) Natanaelel 537
    Odious Numbers retrohun 53
    Sudoku (Fill-in) dokutan 2,572
    Odious Numbers (Long) retrohun 55
    Evil Numbers retrohun 53
    Leap Years BlueNihilist 71
    Sudoku (Fill-in) GolfingSuccess 1,554
    Sudoku (Fill-in) aksyristos 2,674
    Sudoku (Fill-in) scpchicken 366
    Sudoku (Fill-in) CaedenHarper 559
    Mandelbrot solisolu 155
    Pernicious Numbers (Long) aksyristos 92
    Quine Iznoanygod 68
    Proximity Grid solisolu 178
    Happy Numbers solisolu 86
    Happy Numbers (Long) solisolu 85
    Fibonacci Dominoscompute 54
    QR Decoder KasperKivimaeki 139
    Alphabetic Numbers edsrzf 🥈 167
    Fibonacci Verlio-H 74
    Jacobi Symbol kasarino 255
    Apéry’s Constant KasperKivimaeki 133
    Abundant Numbers sona-tau 75
    Fizz Buzz sona-tau 75
    Abundant Numbers (Long) sona-tau 90
    Time Distance KasperKivimaeki 🥉 262
    Pascal’s Triangle Siri-chan 133
    Alphabetic Numbers CaedenHarper 3,911
    Number Spiral KasperKivimaeki 99
    PalindromemordnilaP kasarino 233
    Lucky Numbers kasarino 138
    brainfuck LostSyntax21 215
    Divisors zgialor-lab 69
    Prime Numbers (Long) zgialor-lab 64
    Zodiac Signs KasperKivimaeki 🥈 138
    Emirp Numbers prestosilver 🥇 87
    Emirp Numbers (Long) KasperKivimaeki 97
    Catalan’s Constant prestosilver 320
    Lucky Numbers KasperKivimaeki 🥉 75
    Alphabetic Numbers saito-ta 💎 166
    Evil Numbers zgialor-lab 74
    Quine zgialor-lab 193
    Recamán oaiqjuy 131
    Odious Numbers (Long) oaiqjuy 83
    Abundant Numbers oaiqjuy 75
    brainfuck oaiqjuy 285
    Kaprekar Numbers oaiqjuy 116
    Number Spiral oaiqjuy 156
    Rijndael S-box oaiqjuy 283
    Factorial Factorisation oaiqjuy 133
    Emirp Numbers oaiqjuy 161
    24 Game oaiqjuy 468
    Cubes oaiqjuy 426
    ASCII Table oaiqjuy 188
    Emirp Numbers (Long) oaiqjuy 177
    Lucky Numbers oaiqjuy 149
    Kolakoski Constant oaiqjuy 195