The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 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 799th ondras 884 50 5ms 3 May 2020 799th cywong-amino 🇭🇰 884 50 4ms 20 May 2020 799th Attero 🇸🇪 884 50 5ms 31 Aug 2020 799th sisyphus-ppcg 🇦🇺 884 50 4ms 5 Nov 2020 799th toubsen 🇩🇪 884 50 5ms 26 Dec 2020 799th fuzzylojik-golf 🇺🇸 884 50 5ms 28 Jun 2025 807th primo-ppcg 🇹🇭 884 87 270ms 2 May 2020 808th ETHproductions 🇺🇸 883 37 337ms 22 Dec 2018 808th dokutan 883 37 337ms 18 Mar 2025 810th prplz 🇦🇺 883 48 16ms 19 Sep 2019 810th TFeld00 🇩🇰 883 48 10ms 3 Mar 2020 810th GolfingSuccess 🇬🇷 883 48 15ms 17 Nov 2020 810th urojony 🇵🇱 883 48 21ms 26 Dec 2020 810th btjones0 883 48 17ms 30 Dec 2020 810th Indivicivet 883 48 17ms 22 Mar 2021 810th NewDefectus 🇮🇱 883 48 16ms 27 May 2021 810th Bubbler-4 883 48 9ms 16 Nov 2021 810th KatieLG 🇬🇧 883 48 16ms 2 Jun 2022 810th k3w1k0d3r 883 48 10ms 29 Jun 2022 810th FlorianCassayre 🇫🇷 883 48 16ms 6 Mar 2023 810th quimey 883 48 15ms 15 Jun 2023 810th Andriamanitra 🇫🇮 883 48 17ms 10 Jul 2023 810th stefangimmillaro 883 48 9ms 18 Jul 2023 810th Alex-x90 🇺🇸 883 48 10ms 27 Jul 2023 810th sultan 883 48 10ms 16 Feb 2024 810th driri85 883 48 10ms 16 Feb 2024 810th wen1now 883 48 10ms 1 Mar 2024 810th cpchrispye 883 48 16ms 20 Apr 2024 810th 5cw 🇺🇸 883 48 17ms 6 May 2024 810th egasyelir 883 48 17ms 15 Jul 2024 810th bzijlema 🇳🇱 883 48 17ms 11 Sep 2024 810th moustave 883 48 16ms 9 Jan 2025 810th rollershutter 883 48 16ms 21 Jan 2025 810th Yax42 🇫🇷 883 48 9ms 17 Jun 2025 810th luuumine 🇫🇷 883 48 10ms 29 Oct 2025 810th solisolu 883 48 17ms 1 Jan 2026 837th yanjs 883 53 119ms 3 Jul 2025 838th Steffan153 🇫🇮 882 61 15ms 22 Aug 2024 839th lynn 881 32 3ms 26 Mar 2021 839th perlebach 🇨🇿 881 32 3ms 13 Aug 2021 839th Steffan153 🇫🇮 881 32 3ms 24 Feb 2023 839th sean-niemann 🇺🇸 881 32 3ms 13 Mar 2025 843rd emplv 🇱🇻 881 55 113ms 26 Oct 2022 843rd voytxt 🇨🇿 881 55 122ms 1 Jan 2023 843rd stefangimmillaro 881 55 115ms 20 Jun 2023 843rd mulmul9 🇭🇺 881 55 115ms 8 Sep 2023 847th GrayJoKing 🇦🇺 881 57 4ms 16 Jul 2023 848th initram 881 62 343ms 21 Nov 2021 848th janbehrens 🇩🇪 881 62 367ms 21 Nov 2021 848th jmhowl 881 62 370ms 21 Nov 2021 848th ScottHamper 881 62 360ms 21 Nov 2021 848th Irratix 🇳🇱 881 62 362ms 13 Dec 2021 848th simon-biber 881 62 346ms 7 Feb 2022 848th annaproxy 881 62 355ms 15 Mar 2022 848th voytxt 🇨🇿 881 62 377ms 7 Apr 2022 848th logicolor 881 62 367ms 27 Apr 2022 848th Gaddy 🇫🇷 881 62 370ms 2 May 2022 848th Romain-1 🇫🇷 881 62 346ms 3 May 2022 848th AdrienHache 🇫🇷 881 62 412ms 6 Jun 2023 848th jwonagel 881 62 369ms 25 Sep 2023 848th Babafaba 881 62 366ms 15 Oct 2025 862nd Wanderkind 🇰🇷 881 71 449ms 9 Jan 2023 863rd DialFrost 🇸🇬 881 109 1,443ms 7 Mar 2025 863rd MeWhenI 🇻🇦 881 109 1,431ms 28 Mar 2025 863rd Steffan153 🇫🇮 881 109 1,448ms 4 days ago 866th JayXon 🇺🇸 881 121 1,653ms 15 Sep 2025 867th Steffan153 🇫🇮 880 72 3ms 5 days ago 868th voytxt 🇨🇿 879 35 1,272ms 16 May 2022 868th lynn 879 35 1,257ms 1 Jun 2022 868th emgordon154 879 35 1,230ms 5 Oct 2025 868th edsrzf 🇳🇿 879 35 1,266ms 21 Dec 2025 872nd MeWhenI 🇻🇦 878 46 5ms 31 Dec 2024 873rd frosster 🇨🇦 878 48 2ms 11 Feb 2026 874th sean-niemann 🇺🇸 877 47 144ms 20 Mar 2022 874th MeWhenI 🇻🇦 877 47 140ms 10 Oct 2022 874th DialFrost 🇸🇬 877 47 149ms 8 Nov 2023 874th dokutan 877 47 139ms 25 Sep 2024 878th inventshah 877 50 2ms 9 Sep 2022 878th janbehrens 🇩🇪 877 50 2ms 14 Sep 2022 880th Re-Adventures 🇮🇳 877 81 62ms 2 Jan 2022 First Prev 801–880 of 4,855 Next Last