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 561st davitf 848 92 12ms 18 Aug 2019 561st myleopard 848 92 13ms 15 Oct 2021 561st RYNO8 848 92 13ms 12 Dec 2021 561st aksyristos 848 92 13ms 25 Jan 2023 561st wen1now 848 92 20ms 8 Nov 2023 561st anter69 🇭🇺 848 92 13ms 2 Apr 2024 561st lifthrasiir 🇰🇷 848 92 11ms 11 Nov 2024 561st Pyroan 848 92 12ms 17 Jan 2025 561st moustave 848 92 13ms 27 Jun 2025 561st solisolu 848 92 13ms 7 Nov 2025 561st Lv0Sys 🇵🇱 848 92 12ms 3 Dec 2025 572nd Shanethegamer 🇺🇸 848 134 180ms 7 Apr 2025 573rd MeWhenI 🇻🇦 847 59 7ms 18 Nov 2023 574th Shanethegamer 🇺🇸 847 107 107ms 17 Dec 2021 575th primo-ppcg 🇹🇭 847 232 13ms 25 Jun 2025 576th solmyr2000 846 95 2ms 21 Jun 2022 577th rucin93 🇵🇱 845 75 172ms 31 Oct 2024 577th sean-niemann 🇺🇸 845 75 150ms 8 Jan 2025 579th GrayJoKing 🇦🇺 845 109 40ms 6 Sep 2022 580th DialFrost 🇸🇬 845 120 106ms 2 Dec 2025 581st olivermrose 🇺🇸 844 55 37ms 4 Dec 2021 582nd Steffan153 🇫🇮 844 95 5ms 20 Aug 2023 582nd Shanethegamer 🇺🇸 844 95 5ms 20 Aug 2023 584th GrayJoKing 🇦🇺 843 118 470ms 4 Mar 2022 585th SirBogman 🇺🇸 843 133 41ms 3 Jun 2025 586th dsntzn 🇸🇰 842 76 11ms 29 Aug 2020 586th GusGold 842 76 11ms 17 Nov 2020 588th SirBogman 🇺🇸 842 78 407ms 16 Jan 2024 588th sisyphus-ppcg 🇦🇺 842 78 437ms 17 Jan 2024 588th duckyluuk 🇳🇱 842 78 453ms 27 Mar 2024 588th MeWhenI 🇻🇦 842 78 463ms 24 May 2024 588th GolfingSuccess 🇬🇷 842 78 379ms 5 Feb 2026 588th CaedenHarper 🇨🇦 842 78 398ms 8 Feb 2026 588th Steffan153 🇫🇮 842 78 391ms 11 Feb 2026 595th MeWhenI 🇻🇦 842 80 3ms 13 Oct 2023 595th GolfingSuccess 🇬🇷 842 80 3ms 16 Nov 2023 597th solmyr2000 842 115 437ms 21 Jun 2022 597th inventshah 842 115 449ms 25 Apr 2023 597th KasperKivimaeki 🇫🇮 842 115 427ms 3 Sep 2025 600th boxjelly 842 135 181ms 2 Jan 2021 600th edsrzf 🇳🇿 842 135 177ms 21 Dec 2025 602nd GolfingSuccess 🇬🇷 842 216 1,453ms 6 Mar 2025 603rd alemelis 841 78 294ms 4 Mar 2024 604th ovs-code 🇩🇪 840 107 67ms 18 Sep 2023 605th AforAmpere 839 93 13ms 6 Jun 2020 605th itiievskyi 🇺🇦 839 93 12ms 30 Jul 2020 605th KatieLG 🇬🇧 839 93 13ms 6 Nov 2020 605th gitbedd 🇬🇧 839 93 13ms 28 Dec 2021 605th OllieBoyne 🇬🇧 839 93 13ms 1 Jun 2022 605th bsoyka 🇺🇸 839 93 12ms 16 Jul 2022 605th 5quiwyrm 839 93 14ms 14 Aug 2022 605th Just4FunCoder 839 93 12ms 18 Nov 2022 605th betaveros 839 93 19ms 1 Jan 2023 605th davecame 839 93 12ms 31 Jul 2023 605th msbranicky 839 93 12ms 9 Aug 2023 605th ridingqwerty 🇺🇸 839 93 13ms 3 Dec 2023 605th plcc0 839 93 13ms 7 Mar 2025 605th ahmetdemirag 🇨🇾 839 93 12ms 13 Oct 2025 605th CommandLeo 🇮🇹 839 93 12ms 28 Nov 2025 620th kaascevich 839 108 106ms 20 Jul 2025 621st DaCoolOne 838 88 3ms 22 Feb 2022 622nd bendiscz 838 148 292ms 17 Apr 2020 622nd sean-niemann 🇺🇸 838 148 305ms 29 Aug 2023 624th Shanethegamer 🇺🇸 838 217 1,486ms 28 Apr 2025 625th ZakkkkAttackkkk 🇵🇭 837 96 2ms 6 Feb 2025 626th MichalMarsalek 🇨🇿 837 107 422ms 8 Mar 2022 627th HumanEquivalentUnit 836 64 268ms 24 Jun 2020 627th bstrautin 836 64 367ms 20 Jul 2020 629th MeWhenI 🇻🇦 836 82 10ms 29 Dec 2024 630th lynn 833 54 4ms 27 May 2022 631st btjones0 833 60 119ms 9 Jan 2021 631st janbehrens 🇩🇪 833 60 7ms 5 Dec 2023 633rd snoozingnewt 🇨🇦 832 79 426ms 15 days ago 633rd dokutan 832 79 409ms 14 days ago 635th Steffan153 🇫🇮 832 105 171ms 9 Feb 2024 636th Andrey-Plotnikov 831 77 10ms 2 Jan 2023 636th Maznek 831 77 18ms 4 Jun 2023 636th Natanaelel 🇸🇪 831 77 12ms 18 Jan 2025 639th DialFrost 🇸🇬 831 81 4ms 2 Dec 2024 640th MeWhenI 🇻🇦 831 135 42ms 29 Apr 2025 First Prev 561–640 of 1,904 Next Last