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 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 481st GrayJoKing 🇦🇺 916 53 129ms 18 Oct 2022 482nd Lydxn 🇨🇦 916 55 4ms 16 Jul 2023 483rd voytxt 🇨🇿 916 68 477ms 25 Sep 2025 483rd ScottHamper 916 68 479ms 30 Nov 2025 485th GrayJoKing 🇦🇺 914 44 146ms 3 Aug 2024 485th DialFrost 🇸🇬 914 44 129ms 8 Aug 2024 485th sean-niemann 🇺🇸 914 44 159ms 8 Aug 2024 485th voytxt 🇨🇿 914 44 140ms 8 Aug 2024 485th Steffan153 🇫🇮 914 44 129ms 8 Aug 2024 485th rucin93 🇵🇱 914 44 137ms 9 Aug 2024 485th emplv 🇱🇻 914 44 123ms 29 Oct 2024 492nd GolfingSuccess 🇬🇷 913 23 38ms 14 Aug 2022 492nd primo-ppcg 🇹🇭 913 23 42ms 15 Feb 2023 492nd fuzzylojik-golf 🇺🇸 913 23 44ms a min ago 495th somebody1234 913 43 10ms 7 Dec 2018 495th dymowski 913 43 9ms 7 Jul 2019 495th KrausRaus 🇺🇸 913 43 9ms 22 Aug 2019 495th handisb 913 43 11ms 31 Aug 2019 495th dorinoltean 913 43 9ms 2 Oct 2019 495th oitio 913 43 10ms 12 Feb 2020 495th shuding 913 43 8ms 27 Apr 2020 495th taklam 913 43 10ms 20 May 2020 495th raphaelimahorn 913 43 10ms 4 Sep 2020 495th revlayle 🇺🇸 913 43 10ms 14 Sep 2020 495th PatrickStephansen 🇿🇦 913 43 10ms 15 Oct 2020 495th tpiechaczek 🇵🇱 913 43 10ms 24 Dec 2020 495th toubsen 🇩🇪 913 43 10ms 8 Jan 2021 495th omurakazuaki 🇯🇵 913 43 13ms 19 Feb 2021 495th lukasmoellerch 913 43 11ms 15 Mar 2021 495th MossGrass 🇺🇸 913 43 10ms 21 May 2021 495th wansacis 🇩🇪 913 43 11ms 28 Jul 2021 495th lynn 913 43 10ms 10 Sep 2021 495th alasdair-greenland 913 43 9ms 11 Nov 2021 495th emgordon154 913 43 10ms 23 Nov 2021 495th solmyr2000 913 43 10ms 8 Jun 2022 495th AlephSquirrel 913 43 9ms 18 Jul 2022 495th FlorianCassayre 🇫🇷 913 43 10ms 27 Sep 2022 495th BloodStormKnight 913 43 9ms 13 Oct 2022 495th LukeBridges 🇬🇧 913 43 10ms 17 Oct 2022 495th astonm 913 43 10ms 17 Oct 2022 495th Maznek 913 43 10ms 6 Jun 2023 495th jbt 913 43 9ms 26 Dec 2023 495th wlaud9 913 43 10ms 8 Feb 2024 495th weliveinhell 🇭🇹 913 43 9ms 23 Jul 2024 495th acollett89 913 43 9ms 12 Jun 2025 526th DialFrost 🇸🇬 913 45 2,577ms 23 Oct 2024 526th dokutan 913 45 2,405ms 23 Oct 2024 526th sean-niemann 🇺🇸 913 45 2,527ms 23 Oct 2024 526th MeWhenI 🇻🇦 913 45 2,644ms 24 Oct 2024 526th pardouin 🇫🇷 913 45 2,392ms 24 Oct 2024 526th Chinay-Domitrix 🇺🇸 913 45 2,510ms 25 Feb 2026 532nd initram 913 62 343ms 21 Nov 2021 532nd janbehrens 🇩🇪 913 62 367ms 21 Nov 2021 532nd jmhowl 913 62 370ms 21 Nov 2021 532nd ScottHamper 913 62 360ms 21 Nov 2021 532nd Irratix 🇳🇱 913 62 362ms 13 Dec 2021 532nd simon-biber 913 62 346ms 7 Feb 2022 532nd annaproxy 913 62 355ms 15 Mar 2022 532nd voytxt 🇨🇿 913 62 377ms 7 Apr 2022 532nd logicolor 913 62 367ms 27 Apr 2022 532nd Gaddy 🇫🇷 913 62 370ms 2 May 2022 532nd Romain-1 🇫🇷 913 62 346ms 3 May 2022 532nd AdrienHache 🇫🇷 913 62 412ms 6 Jun 2023 532nd jwonagel 913 62 369ms 25 Sep 2023 532nd Babafaba 913 62 366ms 15 Oct 2025 546th retrohun 912 31 4ms 30 Apr 2019 546th scpchicken 🇵🇼 912 31 3ms 18 Jun 2023 546th fuzzylojik-golf 🇺🇸 912 31 3ms 22 May 2025 549th UnderKoen 🇳🇱 912 72 2ms 16 Jun 2025 550th m-tkach 🇺🇦 912 78 56ms 24 Oct 2022 550th NDR0216 🇹🇼 912 78 62ms 9 May 2024 550th yeminghan2021 912 78 65ms 2 Feb 2025 550th qwertyuiop3 🇷🇺 912 78 59ms 2 Jun 2025 550th emgordon154 912 78 60ms 7 Feb 2026 555th lyphyser 911 45 54ms 8 Jan 2025 556th Steffan153 🇫🇮 911 53 4ms 18 Feb 2023 556th xsot 🇸🇬 911 53 4ms 11 Feb 2024 556th sean-niemann 🇺🇸 911 53 4ms 25 Mar 2025 559th dokutan 910 37 337ms 18 Mar 2025 560th xsot 🇸🇬 910 40 722ms 22 Feb 2026 First Prev 481–560 of 4,873 Next Last