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 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 641st Attero 🇸🇪 830 51 119ms 21 Oct 2020 642nd Haksell 🇦🇶 830 94 12ms 2 Dec 2019 642nd PFedak 830 94 13ms 17 Apr 2020 642nd yzhs 🇩🇪 830 94 13ms 5 Sep 2020 642nd jacklynnepenick 830 94 12ms 26 Aug 2021 642nd georgehulme 830 94 12ms 7 Oct 2022 642nd jmerle 🇳🇱 830 94 12ms 16 Feb 2023 642nd adamnielson42 🇺🇸 830 94 13ms 10 Apr 2023 642nd dirckvdende 830 94 13ms 13 Jul 2025 650th stefangimmillaro 830 121 539ms 6 Oct 2025 651st Sakisan 🇧🇪 830 137 180ms 12 Apr 2022 651st Z-snails 830 137 176ms 5 Dec 2023 653rd DialFrost 🇸🇬 830 219 1,455ms 27 Jan 2025 654th jbbarth 🇫🇷 829 56 41ms 10 Aug 2021 654th tatzyr 🇯🇵 829 56 39ms 24 Nov 2024 654th denkyuu1 829 56 41ms 16 Feb 2026 657th MeWhenI 🇻🇦 829 80 6ms 2 Oct 2022 658th MeWhenI 🇻🇦 829 97 2ms 5 Jul 2024 659th primo-ppcg 🇹🇭 829 99 385ms 21 Nov 2021 660th 4hg 🇺🇸 828 57 34ms 19 Jun 2024 661st emplv 🇱🇻 828 92 122ms 20 Dec 2022 661st Steffan153 🇫🇮 828 92 2,665ms 13 Feb 2026 663rd retrohun 827 52 2ms 9 Nov 2022 664th snyderek 🇺🇸 827 117 444ms 27 Sep 2024 665th emplv 🇱🇻 827 150 292ms 30 Jun 2022 666th ovs-code 🇩🇪 827 220 1,496ms 1 Feb 2025 667th primo-ppcg 🇹🇭 826 90 19ms 28 Jan 2023 667th kg583 🇺🇸 826 90 19ms 20 Oct 2024 667th CLOStrophobic 🇮🇹 826 90 20ms 19 Jan 2025 670th sean-niemann 🇺🇸 824 73 7ms 20 Dec 2024 671st DialFrost 🇸🇬 824 106 179ms 18 Nov 2024 672nd MeWhenI 🇻🇦 823 65 292ms 28 Jan 2023 673rd emgordon154 823 77 151ms 15 Nov 2024 674th ScottHamper 823 122 546ms 30 Nov 2025 675th GrayJoKing 🇦🇺 822 109 462ms 24 Jul 2025 676th ovs-code 🇩🇪 822 121 459ms 14 Jul 2023 677th pg98 821 78 16ms 4 Sep 2019 677th efgen 821 78 12ms 1 Jul 2020 677th KaeruCT 821 78 14ms 7 Oct 2020 677th ernestd 821 78 14ms 22 Jan 2021 677th BambooleanLogic 🇸🇪 821 78 12ms 1 Dec 2021 677th unfinishedprogram 821 78 11ms 29 Jun 2023 683rd alangodfrey 821 95 12ms 13 Sep 2019 683rd tomtheisen 🇺🇸 821 95 12ms 3 Dec 2019 683rd TheBlupper 821 95 13ms 8 Nov 2022 683rd jakobkordez 🇸🇮 821 95 12ms 13 Nov 2022 683rd randolchance 821 95 19ms 6 Feb 2023 683rd janbehrens 🇩🇪 821 95 11ms 5 Dec 2023 683rd EnTerr 821 95 13ms 1 Sep 2024 683rd JudeTyrrell 821 95 13ms 5 Oct 2024 683rd emgordon154 821 95 12ms 14 Apr 2025 683rd Babafaba 821 95 13ms 17 Nov 2025 693rd stefangimmillaro 821 151 290ms 15 Jul 2023 694th jared-hughes 820 98 2ms 17 Jul 2022 695th clockworknazo 819 128 3ms 18 Sep 2022 696th Tine86 819 137 41ms 28 Jul 2025 697th SirBogman 🇺🇸 818 40 3ms 7 Feb 2024 698th emgordon154 817 69 4ms 22 May 2025 699th edsrzf 🇳🇿 817 107 174ms 30 Nov 2025 700th Bubbler-4 817 110 63ms 13 Sep 2023 701st ovs-code 🇩🇪 817 180 35ms 31 Mar 2023 702nd JOrE20 816 38 65ms 12 Feb 2026 703rd primo-ppcg 🇹🇭 816 113 40ms 26 Jun 2022 703rd MeWhenI 🇻🇦 816 113 38ms 6 Sep 2022 703rd sean-niemann 🇺🇸 816 113 42ms 24 Apr 2023 706th Shanethegamer 🇺🇸 816 123 375ms 24 Sep 2025 707th stefangimmillaro 816 134 155ms 6 Nov 2023 708th frankgraziano 815 241 13ms 25 Jun 2025 709th Steffan153 🇫🇮 813 74 8ms 2 Jul 2023 710th andre-lameirinhas 🇵🇹 813 96 19ms 19 Jan 2020 710th Fishron 813 96 12ms 20 Oct 2021 710th guilhem-roy 🇫🇷 813 96 12ms 24 Feb 2022 710th Irratix 🇳🇱 813 96 20ms 25 Apr 2022 710th bob-th 813 96 12ms 14 Feb 2023 710th dranjohn 813 96 13ms 20 Sep 2023 710th snooze92 🇫🇷 813 96 12ms 5 Mar 2025 710th XilianRose 813 96 13ms 5 Mar 2025 710th stulnikau 813 96 12ms 8 Mar 2025 710th DrakeSeteraO 813 96 12ms 27 Oct 2025 710th Googolplexo 🇷🇺 813 96 13ms 2 hours ago First Prev 641–720 of 1,904 Next Last