The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 hours. 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 281st Alex-x90 🇺🇸 897 87 12ms 18 Feb 2023 281st xsot 🇸🇬 897 87 12ms 14 Mar 2023 281st tri1212 🇻🇳 897 87 12ms 9 May 2023 281st InigoK 🇺🇸 897 87 12ms 10 Jun 2023 281st bizy-coder 897 87 13ms 22 Jul 2023 281st fkantelberg 897 87 12ms 27 Jul 2023 281st FortuiteMan 🇫🇷 897 87 13ms 2 Sep 2023 281st Yewzir 🇧🇪 897 87 14ms 20 Sep 2023 281st minhtrancccp 897 87 12ms 27 Sep 2023 281st pardouin 🇫🇷 897 87 13ms 3 Nov 2023 281st rucin93 🇵🇱 897 87 13ms 16 Jan 2024 281st duckyluuk 🇳🇱 897 87 12ms 18 Jan 2024 281st stertooy 🇧🇪 897 87 12ms 14 Jun 2024 281st CaedenHarper 🇨🇦 897 87 13ms 22 Jul 2024 281st b-illy 🇬🇧 897 87 12ms 31 Jul 2024 281st croc54 897 87 12ms 15 Dec 2024 281st kops-cg 897 87 13ms 14 Feb 2025 281st andrewjc2000 897 87 13ms 6 Mar 2025 281st 4atj 897 87 13ms 30 Jun 2025 281st lukegustafson 🇺🇸 897 87 14ms 18 Jul 2025 281st fuzzylojik-golf 🇺🇸 897 87 12ms 22 Aug 2025 281st blaztoma 🇱🇹 897 87 12ms 3 Oct 2025 281st ndren 897 87 14ms 19 Oct 2025 281st ryyyn 🇺🇸 897 87 12ms 2 Nov 2025 281st CornerMercury 🇬🇧 897 87 13ms 26 Nov 2025 281st sunleonid 897 87 13ms 10 Jan 2026 281st souta-1326 897 87 13ms 19 Feb 2026 281st bzijlema 🇳🇱 897 87 13ms 24 Feb 2026 281st Flekay 🇩🇪 897 87 12ms 16 days ago 350th primo-ppcg 🇹🇭 896 48 2ms 10 Nov 2022 351st JayXon 🇺🇸 896 100 391ms 23 Jul 2025 352nd xnor-gate 896 122 169ms 30 Oct 2022 352nd andersk 🇺🇸 896 122 157ms 30 Oct 2022 354th JayXon 🇺🇸 894 85 174ms 24 May 2025 355th CatsAreFluffy 893 59 52ms 23 Jan 2023 356th primo-ppcg 🇹🇭 892 56 6ms 1 Dec 2019 356th sisyphus-ppcg 🇦🇺 892 56 9ms 9 Feb 2022 358th lukegustafson 🇺🇸 892 71 146ms 31 Oct 2024 359th btnlq 892 92 404ms 15 Mar 2023 360th JayXon 🇺🇸 892 98 183ms 6 Apr 2023 361st edsrzf 🇳🇿 891 90 6ms 18 Jun 2025 362nd primo-ppcg 🇹🇭 890 53 35ms 13 Feb 2022 362nd Frowny 890 53 36ms 13 Feb 2022 362nd Bubbler-4 890 53 37ms 14 Feb 2022 365th duckyluuk 🇳🇱 890 77 10ms 13 Jun 2025 366th GrayJoKing 🇦🇺 890 101 131ms 25 Nov 2023 366th error256 890 101 126ms 7 Jun 2025 368th didion0 🇺🇸 889 72 11ms 22 Feb 2022 368th itsh01 889 72 11ms 12 Sep 2022 370th primo-ppcg 🇹🇭 889 83 3ms 13 Feb 2022 370th Waffle3z 889 83 3ms 16 Feb 2022 370th GalladeGuy 🇺🇸 889 83 3ms 30 Mar 2022 370th Shanethegamer 🇺🇸 889 83 3ms 26 Apr 2023 370th GoateSo 889 83 3ms 26 Jul 2023 370th jacobly0 🇺🇸 889 83 3ms 31 Aug 2023 370th FlyingPenguin223 889 83 3ms 15 Oct 2024 370th frosster 🇨🇦 889 83 3ms 7 Feb 2026 378th JayXon 🇺🇸 888 112 497ms 12 Feb 2023 379th JayXon 🇺🇸 888 118 3ms 12 Feb 2023 380th HETHAT 🇩🇿 887 88 13ms 13 Feb 2021 380th mokymok 🇺🇸 887 88 13ms 17 Nov 2021 380th LogicalJoe 887 88 12ms 25 Oct 2022 380th bricknellj 887 88 13ms 29 Dec 2022 380th nayakrujul 887 88 13ms 1 Feb 2023 380th ldoney 887 88 12ms 21 Aug 2023 380th GolfingSuccess 🇬🇷 887 88 12ms 16 Nov 2023 380th 5cw 🇺🇸 887 88 13ms 15 Jun 2024 380th snoozingnewt 🇨🇦 887 88 12ms 17 days ago 380th dokutan 887 88 12ms 16 days ago 390th 386asm 🇺🇸 886 104 38ms 27 Apr 2023 391st DialFrost 🇸🇬 885 68 1,073ms 4 Sep 2025 391st CaedenHarper 🇨🇦 885 68 1,000ms 9 Sep 2025 391st sean-niemann 🇺🇸 885 68 1,081ms 22 Sep 2025 394th GrayJoKing 🇦🇺 885 94 13ms 10 Aug 2023 395th copy 884 37 3ms 12 Aug 2024 396th sean-niemann 🇺🇸 883 86 11ms 16 Aug 2025 397th KasperKivimaeki 🇫🇮 883 91 3ms 2 Feb 2024 398th btnlq 883 105 14ms 11 Feb 2022 398th IanUtley 883 105 17ms 23 May 2024 400th marshallward 🇺🇸 883 127 40ms 6 May 2025 First Prev 321–400 of 1,904 Next Last