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 801st emgordon154 890 70 479ms 25 Sep 2025 801st HumanoidCPU 890 70 440ms 8 Nov 2025 801st h3ra993huskp 🇯🇵 890 70 466ms 30 Nov 2025 801st elgan65536 🇺🇸 890 70 367ms 19 Feb 2026 801st raphaelimahorn 890 70 370ms 16 days ago 806th YoranDS 889 80 64ms 29 May 2023 806th Walter225 889 80 87ms 10 Jul 2023 806th Mandrzejy 🇵🇱 889 80 57ms 22 Feb 2024 806th keelimeguy 🇺🇸 889 80 60ms 16 May 2025 806th GolfingSuccess 🇬🇷 889 80 58ms 2 Sep 2025 806th Andrey2001 889 80 60ms 25 Nov 2025 812th MWI-polygolf 888 46 79ms 18 Feb 2023 812th steffan-polygolf 888 46 83ms 19 Feb 2023 812th DialFrost 🇸🇬 888 46 98ms 8 Nov 2023 812th dokutan 888 46 84ms 25 Sep 2024 816th GrayJoKing 🇦🇺 887 45 119ms 9 Feb 2022 816th sean-niemann 🇺🇸 887 45 125ms 12 Apr 2022 816th MeWhenI 🇻🇦 887 45 121ms 10 Oct 2022 816th MWI-polygolf 887 45 126ms 18 Feb 2023 816th steffan-polygolf 887 45 123ms 19 Feb 2023 816th DialFrost 🇸🇬 887 45 133ms 8 Nov 2023 816th AlephSquirrel 887 45 443ms 21 Jan 2024 816th m-tkach 🇺🇦 887 45 381ms 5 Feb 2024 816th neel11235813 887 45 449ms 2 Mar 2024 816th MeWhenI 🇻🇦 887 45 435ms 13 Jul 2024 816th dokutan 887 45 125ms 25 Sep 2024 816th dokutan 887 45 420ms 25 Sep 2024 816th CaedenHarper 🇨🇦 887 45 430ms 24 Jul 2025 816th Babafaba 887 45 436ms 26 Nov 2025 830th andersk 🇺🇸 887 59 1ms 20 Mar 2020 830th uw4 887 59 1ms 29 Aug 2020 830th janbehrens 🇩🇪 887 59 1ms 22 May 2021 830th lynn 887 59 1ms 2 Oct 2021 830th simon-biber 887 59 1ms 7 Feb 2022 830th LorenzoDeGaspari 887 59 2ms 20 Jun 2022 830th solmyr2000 887 59 1ms 21 Jun 2022 830th AlephSquirrel 887 59 1ms 18 Jul 2022 830th Alex-x90 🇺🇸 887 59 2ms 24 Nov 2022 830th annaproxy 887 59 1ms 8 Jan 2023 830th b10011 🇫🇮 887 59 1ms 8 Jan 2023 830th orthoplex 🇨🇽 887 59 1ms 14 Jun 2024 830th yanjs 887 59 1ms 5 Jul 2025 830th luuumine 🇫🇷 887 59 1ms 29 Oct 2025 830th FoxInTheClouds 887 59 2ms 18 Feb 2026 845th janbehrens 🇩🇪 886 38 346ms 1 Nov 2021 845th MeWhenI 🇻🇦 886 38 312ms 25 Nov 2022 847th villfa 886 50 4ms 27 May 2019 847th UpwardProcess 886 50 5ms 30 Jul 2019 847th ondras 886 50 5ms 3 May 2020 847th cywong-amino 🇭🇰 886 50 4ms 20 May 2020 847th Attero 🇸🇪 886 50 5ms 31 Aug 2020 847th sisyphus-ppcg 🇦🇺 886 50 4ms 5 Nov 2020 847th toubsen 🇩🇪 886 50 5ms 26 Dec 2020 854th CaedenHarper 🇨🇦 886 90 290ms 12 Nov 2025 855th lynn 884 32 3ms 26 Mar 2021 855th perlebach 🇨🇿 884 32 3ms 13 Aug 2021 855th Steffan153 🇫🇮 884 32 3ms 24 Feb 2023 855th sean-niemann 🇺🇸 884 32 3ms 13 Mar 2025 859th yanjs 884 53 119ms 3 Jul 2025 860th GrayJoKing 🇦🇺 884 57 4ms 16 Jul 2023 861st Steffan153 🇫🇮 884 61 15ms 22 Aug 2024 862nd daniel-skalik 🇨🇿 884 64 364ms 21 Nov 2021 862nd fleischa 884 64 368ms 21 Nov 2021 862nd Kloppermand 🇩🇰 884 64 349ms 21 Nov 2021 862nd p-vf 🇨🇭 884 64 356ms 21 Nov 2021 862nd raphaelimahorn 884 64 381ms 21 Nov 2021 862nd revlayle 🇺🇸 884 64 361ms 21 Nov 2021 862nd roavin 884 64 359ms 5 Jul 2022 862nd dteague3989 884 64 355ms 26 May 2023 862nd Decrare 884 64 364ms 12 Sep 2025 862nd Andrey2001 884 64 399ms 26 Nov 2025 872nd prplz 🇦🇺 883 48 16ms 19 Sep 2019 872nd TFeld00 🇩🇰 883 48 10ms 3 Mar 2020 872nd GolfingSuccess 🇬🇷 883 48 15ms 17 Nov 2020 872nd urojony 🇵🇱 883 48 21ms 26 Dec 2020 872nd btjones0 883 48 17ms 30 Dec 2020 872nd Indivicivet 883 48 17ms 22 Mar 2021 872nd NewDefectus 🇮🇱 883 48 16ms 27 May 2021 872nd Bubbler-4 883 48 9ms 16 Nov 2021 872nd KatieLG 🇬🇧 883 48 16ms 2 Jun 2022 First Prev 801–880 of 4,878 Next Last