The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 days. Why not try and solve them ahead of time?
Leap Years 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 795th toubsen 🇩🇪 884 50 5ms 26 Dec 2020 795th fuzzylojik-golf 🇺🇸 884 50 5ms 28 Jun 2025 803rd primo-ppcg 🇹🇭 884 87 270ms 2 May 2020 804th ETHproductions 🇺🇸 883 37 337ms 22 Dec 2018 804th dokutan 883 37 337ms 18 Mar 2025 806th prplz 🇦🇺 883 48 16ms 19 Sep 2019 806th TFeld00 🇩🇰 883 48 10ms 3 Mar 2020 806th GolfingSuccess 🇬🇷 883 48 15ms 17 Nov 2020 806th urojony 🇵🇱 883 48 21ms 26 Dec 2020 806th btjones0 883 48 17ms 30 Dec 2020 806th Indivicivet 883 48 17ms 22 Mar 2021 806th NewDefectus 🇮🇱 883 48 16ms 27 May 2021 806th Bubbler-4 883 48 9ms 16 Nov 2021 806th KatieLG 🇬🇧 883 48 16ms 2 Jun 2022 806th k3w1k0d3r 883 48 10ms 29 Jun 2022 806th FlorianCassayre 🇫🇷 883 48 16ms 6 Mar 2023 806th quimey 883 48 15ms 15 Jun 2023 806th Andriamanitra 🇫🇮 883 48 17ms 10 Jul 2023 806th stefangimmillaro 883 48 9ms 18 Jul 2023 806th Alex-x90 🇺🇸 883 48 10ms 27 Jul 2023 806th sultan 883 48 10ms 16 Feb 2024 806th driri85 883 48 10ms 16 Feb 2024 806th wen1now 883 48 10ms 1 Mar 2024 806th cpchrispye 883 48 16ms 20 Apr 2024 806th 5cw 🇺🇸 883 48 17ms 6 May 2024 806th egasyelir 883 48 17ms 15 Jul 2024 806th bzijlema 🇳🇱 883 48 17ms 11 Sep 2024 806th moustave 883 48 16ms 9 Jan 2025 806th rollershutter 883 48 16ms 21 Jan 2025 806th Yax42 🇫🇷 883 48 9ms 17 Jun 2025 806th luuumine 🇫🇷 883 48 10ms 29 Oct 2025 806th solisolu 883 48 17ms 1 Jan 2026 833rd yanjs 883 53 119ms 3 Jul 2025 834th Steffan153 🇫🇮 882 61 15ms 22 Aug 2024 835th lynn 881 32 3ms 26 Mar 2021 835th perlebach 🇨🇿 881 32 3ms 13 Aug 2021 835th Steffan153 🇫🇮 881 32 3ms 24 Feb 2023 835th sean-niemann 🇺🇸 881 32 3ms 13 Mar 2025 839th initram 881 62 343ms 21 Nov 2021 839th janbehrens 🇩🇪 881 62 367ms 21 Nov 2021 839th jmhowl 881 62 370ms 21 Nov 2021 839th ScottHamper 881 62 360ms 21 Nov 2021 839th Irratix 🇳🇱 881 62 362ms 13 Dec 2021 839th simon-biber 881 62 346ms 7 Feb 2022 839th annaproxy 881 62 355ms 15 Mar 2022 839th voytxt 🇨🇿 881 62 377ms 7 Apr 2022 839th logicolor 881 62 367ms 27 Apr 2022 839th Gaddy 🇫🇷 881 62 370ms 2 May 2022 839th Romain-1 🇫🇷 881 62 346ms 3 May 2022 839th AdrienHache 🇫🇷 881 62 412ms 6 Jun 2023 839th jwonagel 881 62 369ms 25 Sep 2023 839th Babafaba 881 62 366ms 15 Oct 2025 853rd DialFrost 🇸🇬 881 109 1,425ms 7 Mar 2025 853rd MeWhenI 🇻🇦 881 109 1,430ms 28 Mar 2025 853rd Steffan153 🇫🇮 881 109 1,400ms 22 hours ago 856th JayXon 🇺🇸 881 121 1,653ms 15 Sep 2025 857th emplv 🇱🇻 880 55 113ms 26 Oct 2022 857th voytxt 🇨🇿 880 55 122ms 1 Jan 2023 857th stefangimmillaro 880 55 115ms 20 Jun 2023 857th mulmul9 🇭🇺 880 55 115ms 8 Sep 2023 861st GrayJoKing 🇦🇺 880 57 4ms 16 Jul 2023 862nd Wanderkind 🇰🇷 880 71 449ms 9 Jan 2023 863rd Steffan153 🇫🇮 880 72 3ms 2 days ago 864th voytxt 🇨🇿 879 35 1,272ms 16 May 2022 864th lynn 879 35 1,257ms 1 Jun 2022 864th emgordon154 879 35 1,230ms 5 Oct 2025 864th edsrzf 🇳🇿 879 35 1,266ms 21 Dec 2025 868th MeWhenI 🇻🇦 878 46 5ms 31 Dec 2024 869th frosster 🇨🇦 878 48 2ms 11 Feb 2026 870th sean-niemann 🇺🇸 877 47 144ms 20 Mar 2022 870th MeWhenI 🇻🇦 877 47 140ms 10 Oct 2022 870th DialFrost 🇸🇬 877 47 149ms 8 Nov 2023 870th dokutan 877 47 139ms 25 Sep 2024 874th inventshah 877 50 2ms 9 Sep 2022 874th janbehrens 🇩🇪 877 50 2ms 14 Sep 2022 876th Re-Adventures 🇮🇳 877 81 56ms 2 Jan 2022 876th Betuaredead 877 81 59ms 4 Jan 2023 876th aksyristos 877 81 57ms 30 Jan 2023 876th CatsAreFluffy 877 81 58ms 19 Feb 2023 876th namcartoon06 877 81 62ms 30 Jun 2023 First Prev 801–880 of 4,844 Next Last