The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 hours. Why not try and solve them ahead of time?
Divisors 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 879th marshallward 🇺🇸 914 56 39ms 6 May 2025 879th SirBogman 🇺🇸 914 56 40ms 3 Jun 2025 883rd GrayJoKing 🇦🇺 914 66 9ms 1 Nov 2023 884th IanUtley 913 64 9ms 31 Oct 2022 884th ovs-code 🇩🇪 913 64 10ms 30 Jun 2024 884th kops-cg 913 64 29ms 14 Mar 2025 884th error256 913 64 10ms 1 Feb 2026 888th nwellnhof 🇩🇪 913 82 57ms 12 Jun 2022 888th roupiq 🇵🇱 913 82 57ms 23 Nov 2023 888th ovs-code 🇩🇪 913 82 57ms 3 Jun 2024 888th snyderek 🇺🇸 913 82 60ms 9 Jun 2024 888th KasperKivimaeki 🇫🇮 913 82 58ms 24 Mar 2025 888th inventshah 913 82 64ms 1 Apr 2025 888th wojtekmal 913 82 58ms 15 Sep 2025 888th JayXon 🇺🇸 913 82 56ms 10 Dec 2025 896th primo-ppcg 🇹🇭 912 48 9ms 27 Mar 2019 897th MeWhenI 🇻🇦 912 70 39ms 28 Jun 2022 897th GrayJoKing 🇦🇺 912 70 40ms 28 Jun 2022 897th Lydxn 🇨🇦 912 70 40ms 28 Jun 2022 897th primo-ppcg 🇹🇭 912 70 39ms 6 Jul 2022 897th Steffan153 🇫🇮 912 70 39ms 9 Dec 2022 897th 386asm 🇺🇸 912 70 41ms 10 Apr 2023 897th sean-niemann 🇺🇸 912 70 38ms 21 Apr 2023 897th pardouin 🇫🇷 912 70 40ms 16 Aug 2024 897th DialFrost 🇸🇬 912 70 41ms 19 Oct 2024 897th albanian-laundromat 912 70 41ms 23 Dec 2025 897th JayXon 🇺🇸 912 70 41ms 6 Jan 2026 908th Aloso 912 81 122ms 5 Jan 2020 908th SolidTux 912 81 125ms 6 Jan 2020 908th cafehaine 🇫🇷 912 81 127ms 1 May 2022 908th TheSmilingTurtle 912 81 131ms 24 May 2022 908th gustavLindqvist 912 81 123ms 28 Mar 2023 908th WatMan77 912 81 124ms 16 Aug 2023 908th ridingqwerty 🇺🇸 912 81 119ms 3 Aug 2025 915th GrayJoKing 🇦🇺 911 37 3ms 15 Apr 2021 915th kurkale6ka 911 37 4ms 29 Jul 2021 915th saito-ta 🇯🇵 911 37 3ms 26 May 2022 918th MeWhenI 🇻🇦 911 61 3ms 14 Jul 2023 918th Lydxn 🇨🇦 911 61 3ms 14 Jul 2023 918th btnlq 911 61 3ms 15 Jul 2023 918th GrayJoKing 🇦🇺 911 61 3ms 15 Jul 2023 918th Steffan153 🇫🇮 911 61 3ms 15 Jul 2023 918th typeswitch-dev 🇵🇹 911 61 4ms 17 Aug 2023 918th DialFrost 🇸🇬 911 61 3ms 12 Mar 2025 918th sean-niemann 🇺🇸 911 61 3ms 11 Jun 2025 918th fuzzylojik-golf 🇺🇸 911 61 3ms 18 Sep 2025 927th ovs-code 🇩🇪 911 62 63ms 12 Sep 2024 928th labster 910 25 166ms 13 Jul 2018 929th prplz 🇦🇺 910 67 127ms 17 Jun 2021 929th primo-ppcg 🇹🇭 910 67 127ms 17 Jun 2021 929th Lydxn 🇨🇦 910 67 127ms 2 Nov 2021 929th JayXon 🇺🇸 910 67 125ms 8 Nov 2021 929th MichalMarsalek 🇨🇿 910 67 122ms 1 Oct 2022 934th Attero 🇸🇪 910 69 119ms 30 Mar 2020 934th Informagier 910 69 111ms 10 Sep 2020 934th chordowl 910 69 116ms 17 Mar 2021 934th exodrifter 🇺🇸 910 69 117ms 25 Oct 2022 934th RobertHoeh 910 69 114ms 12 Apr 2024 934th HolmDev 910 69 117ms 4 Sep 2025 940th Lydxn 🇨🇦 910 97 25ms 8 Jul 2021 940th primo-ppcg 🇹🇭 910 97 25ms 8 Jul 2021 940th m-tkach 🇺🇦 910 97 24ms 26 Jan 2022 940th error256 910 97 26ms 1 Feb 2026 944th 4hg 🇺🇸 909 22 33ms 3 Jun 2023 944th pardouin 🇫🇷 909 22 34ms 17 Aug 2024 946th rak1507 🇬🇧 909 23 2ms 15 Jan 2022 946th Frowny 909 23 3ms 16 Jan 2022 946th MeWhenI 🇻🇦 909 23 2ms 16 Jan 2022 949th SirBogman 🇺🇸 909 47 451ms 20 Jan 2024 949th DialFrost 🇸🇬 909 47 443ms 28 Jul 2024 949th CaedenHarper 🇨🇦 909 47 424ms 29 Jul 2025 949th albanian-laundromat 909 47 446ms 4 Oct 2025 953rd Blendi-Goose 909 71 1ms 16 Mar 2025 954th GrayJoKing 🇦🇺 909 78 463ms 3 Mar 2022 954th JayXon 🇺🇸 909 78 468ms 22 Nov 2023 956th stefangimmillaro 909 107 298ms 21 Oct 2023 956th fuzzylojik-golf 🇺🇸 909 107 291ms 3 Aug 2025 958th canissimia 🇦🇶 909 175 4ms 7 Oct 2022 959th Lydxn 🇨🇦 908 40 598ms 20 Nov 2021 959th HPWiz 🇳🇿 908 40 634ms 19 Mar 2023 First Prev 881–960 of 5,510 Next Last