The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 days. Why not try and solve them ahead of time?
Ordinal Numbers 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 641st TimCurwick 🇺🇸 790 67 311ms 29 Sep 2020 641st hasan1st 790 67 297ms 28 May 2022 641st juliansiebert 🇩🇪 790 67 268ms 10 Nov 2024 641st madex 🇩🇪 790 67 330ms 12 days ago 645th tuffnatty 🇩🇪 790 104 11ms 20 Jul 2023 646th Shanethegamer 🇺🇸 790 156 294ms 2 Nov 2024 647th DialFrost 🇸🇬 788 92 2ms 6 Mar 2024 647th ovs-code 🇩🇪 788 92 2ms 21 Mar 2024 647th GolfingSuccess 🇬🇷 788 92 2ms 6 Mar 2025 650th jbbarth 🇫🇷 787 56 41ms 10 Aug 2021 650th SirBogman 🇺🇸 787 56 34ms 21 May 2022 650th denkyuu1 787 56 41ms 16 Feb 2026 653rd GolfingSuccess 🇬🇷 787 132 3ms 6 Mar 2025 654th btjones0 787 138 180ms 9 Jan 2021 654th DialFrost 🇸🇬 787 138 161ms 25 Aug 2024 654th edsrzf 🇳🇿 787 138 162ms 3 days ago 657th tomh1012 786 81 12ms 16 Sep 2020 657th maxpelic 🇺🇸 786 81 14ms 5 Jul 2022 657th CarsonChr 🇺🇸 786 81 13ms 23 Apr 2024 657th dokutan 786 81 12ms 20 Mar 2025 661st cafehaine 🇫🇷 786 93 3ms 27 Apr 2022 661st Blendi-Goose 786 93 3ms 16 Mar 2025 663rd ovs-code 🇩🇪 785 78 6ms 10 Feb 2023 664th pardouin 🇫🇷 784 96 2,726ms 26 Oct 2024 665th emplv 🇱🇻 783 76 6ms 3 Jul 2023 666th saito-ta 🇯🇵 781 32 58ms 25 Jan 2024 666th ovs-code 🇩🇪 781 32 59ms 21 Mar 2024 666th fuzzylojik-golf 🇺🇸 781 32 61ms 9 Aug 2025 666th DialFrost 🇸🇬 781 32 61ms 9 Sep 2025 666th Steffan153 🇫🇮 781 32 56ms 14 Feb 2026 671st Shanethegamer 🇺🇸 781 133 3ms 10 Sep 2022 671st inventshah 781 133 3ms 11 Sep 2022 673rd filharmonista 780 93 2ms 13 Mar 2020 673rd ccbrown 780 93 2ms 20 Apr 2020 673rd prplz 🇦🇺 780 93 2ms 13 Feb 2022 676th voytxt 🇨🇿 779 232 1,419ms 28 Feb 2025 677th JRaspass 🇬🇧 778 48 3ms 11 Jul 2019 677th scpchicken 🇵🇼 778 48 4ms 9 Apr 2022 679th DialFrost 🇸🇬 778 60 30ms 2 Aug 2025 680th prplz 🇦🇺 778 68 627ms 5 Jun 2020 681st MeWhenI 🇻🇦 778 90 33ms 9 May 2024 682nd primo-ppcg 🇹🇭 778 114 374ms 15 Jan 2021 683rd Bubbler-4 777 41 3ms 19 Jan 2022 683rd rak1507 🇬🇧 777 41 3ms 2 Jan 2023 685th CatsAreFluffy 776 57 4ms 23 Jan 2023 686th rucin93 🇵🇱 776 75 172ms 31 Oct 2024 687th DayDun 🇸🇪 776 82 11ms 22 Jan 2023 687th CatsAreFluffy 776 82 14ms 18 Feb 2023 689th Shanethegamer 🇺🇸 776 97 110ms 14 Oct 2022 689th MeWhenI 🇻🇦 776 97 2,753ms 27 Oct 2024 691st revlayle 🇺🇸 776 105 400ms 21 Nov 2021 691st Steffan153 🇫🇮 776 105 386ms 28 Jan 2023 693rd dokutan 776 134 3ms 29 Jun 2024 693rd albanian-laundromat 776 134 3ms 19 Dec 2025 695th elgan65536 🇺🇸 776 140 173ms 10 Apr 2024 696th GolfingSuccess 🇬🇷 774 95 18ms 6 Mar 2025 697th RussellEmerine 774 146 175ms 30 Nov 2019 697th guliyevemil1 🇦🇿 774 146 174ms 25 Apr 2020 699th anter69 🇭🇺 773 57 56ms 2 Apr 2024 700th annaproxy 773 82 19ms 24 Nov 2021 701st Attero 🇸🇪 772 94 2ms 24 May 2020 702nd Babafaba 771 74 394ms 10 Oct 2025 703rd nipzu 771 141 189ms 13 Jan 2022 703rd Shanethegamer 🇺🇸 771 141 162ms 16 Sep 2024 705th MeWhenI 🇻🇦 769 106 389ms 26 Jul 2023 705th stefangimmillaro 769 106 404ms 26 Jul 2023 705th sean-niemann 🇺🇸 769 106 458ms 9 Aug 2024 708th m-tkach 🇺🇦 769 136 25ms 20 Feb 2023 709th MeWhenI 🇻🇦 769 254 12ms 21 Apr 2025 710th stefangimmillaro 768 98 2,722ms 30 Oct 2024 710th edsrzf 🇳🇿 768 98 112ms 8 Nov 2025 712th DialFrost 🇸🇬 767 47 36ms 27 Jan 2023 713th mintypython 767 83 11ms 14 Aug 2019 713th fitzdotlol 🇺🇸 767 83 16ms 8 Mar 2022 713th inventshah 767 83 11ms 23 Aug 2022 713th adamnielson42 🇺🇸 767 83 11ms 25 Apr 2023 713th TheDarkThatBarks 767 83 11ms 28 Jan 2024 718th Shanethegamer 🇺🇸 766 96 15ms 5 Oct 2021 718th DialFrost 🇸🇬 766 96 17ms 9 Dec 2024 720th targrik 766 161 304ms 3 Jul 2025 First Prev 641–720 of 1,895 Next Last