The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 25 hours. 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 638th andersk 🇺🇸 902 47 16ms 20 Mar 2020 638th Attero 🇸🇪 902 47 9ms 9 May 2020 638th neihousaigaai 902 47 16ms 8 May 2021 638th Waffle3z 902 47 16ms 14 Jul 2021 638th janbehrens 🇩🇪 902 47 16ms 21 Oct 2021 638th annaproxy 902 47 16ms 13 Dec 2021 638th pxeger 🇬🇧 902 47 15ms 16 Feb 2022 638th sisyphus-ppcg 🇦🇺 902 47 17ms 19 Feb 2022 638th shellbertt 🇨🇦 902 47 15ms 2 May 2022 638th mrnomm 902 47 16ms 24 Aug 2022 638th jumelet 🇳🇱 902 47 16ms 23 Dec 2022 638th thatbirdguythatuknownot 902 47 20ms 3 Jan 2023 638th MichalMarsalek 🇨🇿 902 47 10ms 23 Feb 2023 638th AlexanderFair 902 47 17ms 15 Jun 2023 638th inventshah 902 47 21ms 18 Jul 2023 638th ListeriaM 902 47 19ms 24 Aug 2023 638th bizy-coder 902 47 18ms 2 Feb 2024 638th BREMAUCY 🇫🇷 902 47 21ms 25 Mar 2024 638th Bulmenisaurus 902 47 19ms 4 Aug 2024 638th voytxt 🇨🇿 902 47 16ms 20 Sep 2024 638th dokutan 902 47 10ms 25 Sep 2024 638th lifthrasiir 🇰🇷 902 47 17ms 20 Nov 2024 638th jipsong 🇩🇪 902 47 10ms 1 Apr 2025 638th KasperKivimaeki 🇫🇮 902 47 15ms 14 May 2025 638th keelimeguy 🇺🇸 902 47 20ms 16 May 2025 638th Flekay 🇩🇪 902 47 16ms 9 Aug 2025 638th janlelis 902 47 16ms 14 Aug 2025 638th snoozingnewt 🇨🇦 902 47 16ms 26 Sep 2025 638th Emutis 🇱🇹 902 47 19ms 25 Oct 2025 638th CommandLeo 🇮🇹 902 47 17ms 30 Nov 2025 638th Lv0Sys 🇵🇱 902 47 16ms 2 Dec 2025 672nd neel11235813 902 51 1,349ms 4 Jan 2023 672nd MeWhenI 🇻🇦 902 51 1,349ms 8 Jun 2023 672nd dokutan 902 51 1,286ms 14 Oct 2024 672nd DialFrost 🇸🇬 902 51 1,281ms 9 Mar 2025 672nd sean-niemann 🇺🇸 902 51 1,333ms 18 Apr 2025 672nd fuzzylojik-golf 🇺🇸 902 51 1,359ms 2 Sep 2025 678th sean-niemann 🇺🇸 901 38 79ms 14 Sep 2023 678th blaztoma 🇱🇹 901 38 75ms 2 Nov 2025 680th retrohun 901 46 1ms 16 Jun 2024 681st arjanadriaanse 🇳🇱 901 52 121ms 1 Jan 2022 682nd Shanethegamer 🇺🇸 901 79 59ms 12 Jan 2022 682nd Yewzir 🇧🇪 901 79 57ms 9 Dec 2023 682nd oceko 901 79 58ms 19 Feb 2024 682nd CaedenHarper 🇨🇦 901 79 62ms 1 Feb 2025 682nd yanjs 901 79 478ms 10 Jul 2025 682nd AutumnWind75 901 79 446ms 10 Dec 2025 682nd bac0id 901 79 60ms 27 Jan 2026 689th MeWhenI 🇻🇦 899 54 111ms 15 Oct 2022 689th Yax42 🇫🇷 899 54 104ms 5 Oct 2025 691st AlephSquirrel 899 60 5ms 13 Mar 2023 691st Lydxn 🇨🇦 899 60 15ms 31 Jan 2025 691st edsrzf 🇳🇿 899 60 14ms 14 Dec 2025 694th billings7 🇬🇧 898 63 367ms 21 Nov 2021 694th ChristophHornung 898 63 374ms 21 Nov 2021 694th KatieLG 🇬🇧 898 63 365ms 17 Oct 2022 697th DialFrost 🇸🇬 896 36 3ms 11 Aug 2024 697th MeWhenI 🇻🇦 896 36 3ms 12 Aug 2024 697th sean-niemann 🇺🇸 896 36 3ms 13 Aug 2024 697th GrayJoKing 🇦🇺 896 36 3ms 26 Aug 2024 697th lynn 896 36 3ms 21 Dec 2024 702nd nwellnhof 🇩🇪 896 89 295ms 3 Sep 2020 702nd MeWhenI 🇻🇦 896 89 273ms 10 Oct 2022 702nd DialFrost 🇸🇬 896 89 285ms 8 Nov 2023 702nd ovs-code 🇩🇪 896 89 6ms 8 Jul 2024 702nd dokutan 896 89 285ms 25 Sep 2024 702nd fuzzylojik-golf 🇺🇸 896 89 272ms 15 Jul 2025 702nd KasperKivimaeki 🇫🇮 896 89 273ms 29 Sep 2025 702nd edsrzf 🇳🇿 896 89 285ms 21 Dec 2025 710th Yewzir 🇧🇪 895 70 443ms 17 Nov 2023 711th canissimia 🇦🇶 895 83 6ms 1 Aug 2023 712th MeWhenI 🇻🇦 894 45 139ms 3 Aug 2024 712th dokutan 894 45 135ms 25 Sep 2024 714th clockworknazo 894 54 3ms 23 Oct 2022 715th Shanethegamer 🇺🇸 894 64 107ms 15 Apr 2025 715th snoozingnewt 🇨🇦 894 64 110ms 1 Dec 2025 715th emgordon154 894 64 108ms 1 Dec 2025 715th DialFrost 🇸🇬 894 64 114ms 3 Dec 2025 715th sean-niemann 🇺🇸 894 64 100ms 4 Jan 2026 715th Steffan153 🇫🇮 894 64 112ms 27 Feb 2026 First Prev 641–720 of 4,879 Next Last