The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
Prime Numbers (Long) in all languages in chars. Achievements Cheevos Holes Languages Medals Miscellaneous All Holes 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Calendar Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz Continued Fractions CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Multitap Input Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial All Languages ><> ALGOL 68 ArkScript Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig 05AB1E APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Bytes Chars Scoring Bytes Chars Language All ><> ALGOL 68 ArkScript Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig Experimental Language 05AB1E APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Hole All 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Calendar Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz Continued Fractions CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Multitap Input Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Experimental Hole Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Chars Time Submitted 881st AdrienHache 🇫🇷 877 81 109ms 6 Jan 2024 881st zygoloid 877 81 3,716ms 4 Aug 2024 881st tailorspy 877 81 109ms 5 Aug 2024 881st qwertyuiop3 🇷🇺 877 81 102ms 15 May 2025 881st yeminghan2021 877 81 110ms 3 Feb 2026 886th primo-ppcg 🇹🇭 877 99 388ms 5 Dec 2021 886th janbehrens 🇩🇪 877 99 328ms 6 Dec 2021 886th DialFrost 🇸🇬 877 99 316ms 21 Nov 2025 889th CameronGBell 875 49 195ms 16 Nov 2022 889th snydej 875 49 151ms 3 Dec 2024 891st j2e2 🇪🇸 875 55 146ms 3 Mar 2025 892nd prplz 🇦🇺 874 21 154ms 6 Dec 2021 892nd Steffan153 🇫🇮 874 21 152ms 30 Oct 2022 892nd DialFrost 🇸🇬 874 21 141ms 10 Feb 2023 892nd SirFireball3521 874 21 157ms 27 Feb 2023 892nd Natanaelel 🇸🇪 874 21 157ms 3 Dec 2023 892nd ovs-code 🇩🇪 874 21 165ms 29 Dec 2023 892nd pardouin 🇫🇷 874 21 166ms 20 Aug 2024 892nd sean-niemann 🇺🇸 874 21 160ms 17 Jan 2025 892nd fuzzylojik-golf 🇺🇸 874 21 154ms 20 Jun 2025 892nd edsrzf 🇳🇿 874 21 139ms 12 Oct 2025 902nd edsrzf 🇳🇿 874 64 133ms 15 days ago 903rd Steffan153 🇫🇮 873 48 430ms 8 days ago 904th shellbertt 🇨🇦 872 36 49ms 6 Dec 2021 904th orthoplex 🇨🇽 872 36 42ms 30 Mar 2022 904th DaCuteRaccoon 872 36 41ms 17 Apr 2022 904th jared-hughes 872 36 44ms 20 Sep 2022 904th OhmNomNom 872 36 42ms 9 Oct 2022 904th annaproxy 872 36 40ms 15 Sep 2023 904th dokutan 872 36 45ms 30 Apr 2024 904th LostSyntax21 🇬🇧 872 36 44ms 24 Jul 2025 912th DialFrost 🇸🇬 872 59 128ms 25 Jun 2025 913th clockworknazo 871 19 96ms 9 Aug 2022 913th saito-ta 🇯🇵 871 19 495ms 7 Nov 2022 915th Jacob385 871 45 594ms 4 Apr 2024 915th RedzGoose 🇦🇺 871 45 553ms 12 Sep 2024 917th Steffan153 🇫🇮 870 52 203ms 9 Feb 2023 917th DialFrost 🇸🇬 870 52 227ms 28 Dec 2025 919th GolfingSuccess 🇬🇷 870 59 42ms 5 Dec 2021 919th GrayJoKing 🇦🇺 870 59 42ms 4 Mar 2022 919th MeWhenI 🇻🇦 870 59 43ms 6 Nov 2022 919th Bmrl7 870 59 40ms 11 Jul 2023 919th Widgitty 870 59 50ms 31 Jul 2023 919th Attero 🇸🇪 870 59 50ms 20 Sep 2023 919th AdrienHache 🇫🇷 870 59 43ms 6 Jan 2024 919th Mandrzejy 🇵🇱 870 59 4,944ms 31 May 2024 919th CaedenHarper 🇨🇦 870 59 43ms 26 Jan 2025 919th emgordon154 870 59 43ms 1 Jul 2025 919th fuzzylojik-golf 🇺🇸 870 59 44ms 14 Aug 2025 919th Yax42 🇫🇷 870 59 43ms 15 Oct 2025 931st dmrichwa 🇺🇸 869 42 97ms 19 Oct 2023 931st targrik 869 42 58ms 19 Feb 2025 931st Yax42 🇫🇷 869 42 57ms 10 Sep 2025 934th GrayJoKing 🇦🇺 869 55 1,148ms 19 Nov 2025 934th ovs-code 🇩🇪 869 55 1,153ms 19 Nov 2025 936th GrayJoKing 🇦🇺 869 76 225ms 20 Jan 2023 936th Steffan153 🇫🇮 869 76 220ms 31 Mar 2023 936th lynn 869 76 145ms 18 Jul 2023 936th m-tkach 🇺🇦 869 76 190ms 3 Aug 2023 940th 0xjac 🇨🇭 869 100 296ms 18 Nov 2025 941st primo-ppcg 🇹🇭 868 23 76ms 8 Dec 2021 942nd NickTheEASDude 🇺🇸 868 68 522ms 14 Nov 2023 943rd canissimia 🇦🇶 868 116 1,945ms 14 Nov 2022 944th JayXon 🇺🇸 868 136 1,677ms 15 Sep 2025 944th DialFrost 🇸🇬 868 136 1,646ms 18 Jan 2026 946th Garklein 🇨🇦 867 15 34ms 4 Jan 2022 946th dragonsourced 867 15 34ms 21 Apr 2022 946th AlephSquirrel 867 15 34ms 1 Jul 2022 946th duckyluuk 🇳🇱 867 15 33ms 19 Sep 2024 946th Samuel-George-Greenberger 867 15 35ms 17 Dec 2025 951st janbehrens 🇩🇪 867 82 102ms 8 Jan 2022 951st jared-hughes 867 82 68ms 24 Oct 2022 951st Betuaredead 867 82 101ms 14 Nov 2023 951st Yewzir 🇧🇪 867 82 100ms 30 Dec 2023 951st fuzzylojik-golf 🇺🇸 867 82 108ms 14 Aug 2025 956th primo-ppcg 🇹🇭 867 180 1,125ms 10 Jul 2025 957th Shanethegamer 🇺🇸 866 55 544ms 5 Dec 2021 957th GrayJoKing 🇦🇺 866 55 538ms 6 Dec 2021 957th SirBogman 🇺🇸 866 55 536ms 6 Dec 2021 957th MeWhenI 🇻🇦 866 55 531ms 6 Dec 2021 First Prev 881–960 of 3,099 Next Last