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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
    Farey Sequence codereport 78
    Jacobi Symbol codereport 71
    Farey Sequence Steffan153 🥉 24
    Lucky Tickets Steffan153 27
    brainfuck codereport 🥈 52
    Star Wars Opening Crawl codereport 206
    Sudoku codereport 278
    Reverse Polish Notation darrenks 🥇 4
    Sudoku (Fill-in) codereport 🥉 101
    DFA Simulator MeWhenI 72
    Reverse Polish Notation codereport 🥇 4
    Pascal’s Triangle Steffan153 🥇 23
    Trinomial Triangle Steffan153 🥇 26
    Fibonacci Dominoscompute 14
    Leap Years scpchicken 29
    Kolakoski Sequence ovs-code 💎 25
    Levenshtein Distance CaedenHarper 68
    Medal Tally oaiqjuy 75
    Gray Code Decoder oaiqjuy 🥇 18
    Zeckendorf Representation oaiqjuy 40
    Gray Code Encoder oaiqjuy 21
    DFA Simulator oaiqjuy 99
    Minesweeper oaiqjuy 66
    Diamonds MeWhenI 35
    Alphabetic Numbers saito-ta 🥈 82
    Kaprekar Numbers MeWhenI 171
    Gijswijt’s Sequence MeWhenI 🥉 48
    SI Units MeWhenI 🥉 421
    Mahjong MeWhenI 192
    Calendar MeWhenI 🥉 153
    Morse Decoder vang1ong7ang 💎 81
    Spelling Numbers vang1ong7ang 🥉 257
    CSS Colors vang1ong7ang 🥇 550
    Time Distance vang1ong7ang 🥉 166
    Sudoku vang1ong7ang 237
    QR Decoder vang1ong7ang 🥈 87
    ISBN oaiqjuy 68
    Topological Sort vang1ong7ang 🥉 37
    Rock-paper-scissors-Spock-lizard vang1ong7ang 🥉 146
    Poker MeWhenI 🥉 186
    Musical Chords vang1ong7ang 74
    Catalan’s Constant vang1ong7ang 🥈 51
    Prime Numbers oaiqjuy 24
    Leyland Numbers oaiqjuy 46
    ROT13 MeWhenI 32
    Leap Years oaiqjuy 40
    Foo Fizz Buzz Bar oaiqjuy 62
    Catalan Numbers oaiqjuy 25
    Pernicious Numbers oaiqjuy 23
    Odious Numbers oaiqjuy 19
    Evil Numbers oaiqjuy 20
    Niven Numbers oaiqjuy 23
    Divisors oaiqjuy 27
    Abundant Numbers oaiqjuy 29
    Fibonacci oaiqjuy 17
    Happy Numbers oaiqjuy 27
    Fizz Buzz oaiqjuy 37
    Tutorial oaiqjuy 23
    Emojify CaedenHarper 140
    Collatz oaiqjuy 43
    Quine oaiqjuy 15
    Billiards MeWhenI 75
    Minesweeper MeWhenI 65
    Polyominoes MeWhenI 139
    Musical Chords MeWhenI 88
    Multitap Input MeWhenI 🥉 63
    ISBN MeWhenI 35
    Hilbert Curve MeWhenI 🥉 391
    Set MeWhenI 61
    Sierpiński Triangle MeWhenI 50
    Pernicious Numbers (Long) MeWhenI 35
    Odious Numbers (Long) MeWhenI 18
    Odious Numbers MeWhenI 17
    Evil Numbers MeWhenI 18
    Kolakoski Sequence MeWhenI 28
    Leap Years MeWhenI 22
    Diamonds scpchicken 37
    Emirp Numbers scpchicken 38
    Sierpiński Triangle scpchicken 🥇 36
    Collatz scpchicken 27
    Lucky Tickets scpchicken 30
    Evil Numbers (Long) scpchicken 18
    Evil Numbers scpchicken 16
    Foo Fizz Buzz Bar scpchicken 62
    Odious Numbers scpchicken 17
    Odious Numbers (Long) scpchicken 19
    Abundant Numbers (Long) scpchicken 🥇 24
    Abundant Numbers scpchicken 🥇 23
    Catalan Numbers scpchicken 🥇 20
    Pernicious Numbers scpchicken 🥇 15
    Niven Numbers (Long) scpchicken 🥇 24
    Tower of Hanoi scpchicken 🥇 29
    Christmas Trees MeWhenI 33
    Christmas Trees scpchicken 33
    Catalan’s Constant MeWhenI 🥉 53
    Smith Numbers MeWhenI 90
    Van Eck Sequence scpchicken 18
    Morse Decoder MeWhenI 109
    Scrambled Sort scpchicken 🥈 24
    Roman to Arabic oaiqjuy 50