The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 days. Why not try and solve them ahead of time?
Ordinal Numbers in all languages in bytes. 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 Bytes Time Submitted 800th Blendi-Goose 793 93 3ms 16 Mar 2025 802nd pardouin 🇫🇷 793 96 2,726ms 26 Oct 2024 803rd 09cf 793 122 479ms 3 Feb 2024 804th emplv 🇱🇻 792 76 6ms 3 Jul 2023 805th DialFrost 🇸🇬 792 80 144ms 29 Oct 2024 806th lifthrasiir 🇰🇷 792 83 525ms 2 Dec 2024 807th btjones0 792 138 159ms 9 Jan 2021 807th DialFrost 🇸🇬 792 138 159ms 25 Aug 2024 809th tomh1012 790 81 12ms 16 Sep 2020 809th maxpelic 🇺🇸 790 81 14ms 5 Jul 2022 809th CarsonChr 🇺🇸 790 81 13ms 23 Apr 2024 809th dokutan 790 81 12ms 20 Mar 2025 813th CatsAreFluffy 789 57 4ms 23 Jan 2023 814th abailey2020 🇺🇸 788 99 13ms 12 Dec 2020 814th Indivicivet 788 99 20ms 29 Mar 2021 814th amollberg 🇸🇪 788 99 12ms 26 Jan 2022 814th argusdusty 🇺🇸 788 99 13ms 21 Aug 2022 814th fgrosshans 🇫🇷 788 99 13ms 17 Jul 2024 814th Artemis21 🇬🇧 788 99 13ms 10 Jan 2025 820th Babafaba 788 102 2ms 10 Oct 2025 821st Shanethegamer 🇺🇸 788 133 3ms 10 Sep 2022 821st inventshah 788 133 3ms 11 Sep 2022 823rd proton 🇩🇪 787 59 37ms 20 Jun 2020 824th prplz 🇦🇺 787 68 627ms 5 Jun 2020 825th GrayJoKing 🇦🇺 787 111 190ms 20 May 2022 826th jared-hughes 787 123 446ms 17 Jul 2022 827th lynn 786 60 34ms 13 Feb 2022 828th AdrienHache 🇫🇷 786 67 49ms 13 Dec 2024 829th primo-ppcg 🇹🇭 786 114 374ms 15 Jan 2021 830th Shanethegamer 🇺🇸 785 97 110ms 14 Oct 2022 830th MeWhenI 🇻🇦 785 97 2,753ms 27 Oct 2024 832nd voytxt 🇨🇿 784 232 1,491ms 28 Feb 2025 833rd GolfingSuccess 🇬🇷 782 95 18ms 6 Mar 2025 834th dokutan 782 134 3ms 29 Jun 2024 834th albanian-laundromat 782 134 3ms 19 Dec 2025 836th primo-ppcg 🇹🇭 781 61 1,055ms 18 Feb 2022 837th DayDun 🇸🇪 781 82 11ms 22 Jan 2023 837th CatsAreFluffy 781 82 14ms 18 Feb 2023 839th revlayle 🇺🇸 781 105 400ms 21 Nov 2021 839th Steffan153 🇫🇮 781 105 386ms 28 Jan 2023 841st elgan65536 🇺🇸 781 140 167ms 10 Apr 2024 842nd skps2010 780 100 13ms 21 Jul 2019 842nd guliyevemil1 🇦🇿 780 100 12ms 16 Apr 2020 842nd AdamHe17 780 100 12ms 31 May 2022 842nd nullie 780 100 14ms 10 Jun 2022 842nd jfallon1997 780 100 14ms 17 Aug 2022 842nd StefanHabel 🇨🇦 780 100 13ms 20 Dec 2022 842nd thehylian 780 100 12ms 25 Dec 2022 842nd ssbhatt4321 780 100 20ms 27 Oct 2023 842nd Andriamanitra 🇫🇮 780 100 13ms 20 Jun 2024 851st RussellEmerine 779 146 175ms 30 Nov 2019 851st guliyevemil1 🇦🇿 779 146 174ms 25 Apr 2020 853rd lynn 777 49 3ms 3 Apr 2021 854th stefangimmillaro 777 98 2,722ms 30 Oct 2024 854th edsrzf 🇳🇿 777 98 112ms 8 Nov 2025 856th m-tkach 🇺🇦 776 136 25ms 20 Feb 2023 857th nipzu 775 141 171ms 13 Jan 2022 857th Shanethegamer 🇺🇸 775 141 159ms 16 Sep 2024 859th Shanethegamer 🇺🇸 774 96 15ms 5 Oct 2021 859th DialFrost 🇸🇬 774 96 17ms 9 Dec 2024 861st MeWhenI 🇻🇦 774 106 389ms 26 Jul 2023 861st stefangimmillaro 774 106 404ms 26 Jul 2023 861st sean-niemann 🇺🇸 774 106 458ms 9 Aug 2024 864th m-tkach 🇺🇦 774 125 448ms 23 Aug 2022 865th DialFrost 🇸🇬 773 61 34ms 27 Jan 2023 866th ridingqwerty 🇺🇸 773 85 720ms 22 Jan 2024 867th Irratix 🇳🇱 773 104 3ms 13 Feb 2022 867th m-tkach 🇺🇦 773 104 2ms 23 Aug 2022 869th MeWhenI 🇻🇦 773 254 12ms 21 Apr 2025 870th janbehrens 🇩🇪 772 78 8ms 5 Dec 2023 870th mpn2005 772 78 8ms 3 Nov 2024 870th DialFrost 🇸🇬 772 78 8ms 6 Sep 2025 873rd ian-h-chamberlain 🇺🇸 772 101 12ms 8 Jan 2020 873rd LlamaLad7 🇬🇧 772 101 12ms 23 Jan 2021 873rd mauro-1 🇮🇹 772 101 12ms 17 Aug 2021 873rd za3k 772 101 13ms 12 Oct 2022 877th albanian-laundromat 771 78 965ms 13 Nov 2025 878th mintypython 771 83 11ms 14 Aug 2019 878th fitzdotlol 🇺🇸 771 83 16ms 8 Mar 2022 878th inventshah 771 83 11ms 23 Aug 2022 First Prev 801–880 of 1,902 Next Last