The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 28 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 801st kg583 🇺🇸 890 62 39ms 13 Feb 2025 802nd emgordon154 890 70 479ms 25 Sep 2025 802nd HumanoidCPU 890 70 440ms 8 Nov 2025 802nd h3ra993huskp 🇯🇵 890 70 466ms 30 Nov 2025 802nd elgan65536 🇺🇸 890 70 367ms 19 Feb 2026 802nd raphaelimahorn 890 70 370ms 18 days ago 807th YoranDS 889 80 64ms 29 May 2023 807th Walter225 889 80 87ms 10 Jul 2023 807th Mandrzejy 🇵🇱 889 80 57ms 22 Feb 2024 807th keelimeguy 🇺🇸 889 80 60ms 16 May 2025 807th GolfingSuccess 🇬🇷 889 80 58ms 2 Sep 2025 807th Andrey2001 889 80 60ms 25 Nov 2025 813th MWI-polygolf 888 46 79ms 18 Feb 2023 813th steffan-polygolf 888 46 83ms 19 Feb 2023 813th DialFrost 🇸🇬 888 46 98ms 8 Nov 2023 813th dokutan 888 46 84ms 25 Sep 2024 817th GrayJoKing 🇦🇺 887 45 119ms 9 Feb 2022 817th sean-niemann 🇺🇸 887 45 125ms 12 Apr 2022 817th MeWhenI 🇻🇦 887 45 121ms 10 Oct 2022 817th MWI-polygolf 887 45 126ms 18 Feb 2023 817th steffan-polygolf 887 45 123ms 19 Feb 2023 817th DialFrost 🇸🇬 887 45 133ms 8 Nov 2023 817th AlephSquirrel 887 45 443ms 21 Jan 2024 817th m-tkach 🇺🇦 887 45 381ms 5 Feb 2024 817th neel11235813 887 45 449ms 2 Mar 2024 817th MeWhenI 🇻🇦 887 45 435ms 13 Jul 2024 817th dokutan 887 45 125ms 25 Sep 2024 817th dokutan 887 45 420ms 25 Sep 2024 817th CaedenHarper 🇨🇦 887 45 430ms 24 Jul 2025 817th Babafaba 887 45 436ms 26 Nov 2025 831st andersk 🇺🇸 887 59 1ms 20 Mar 2020 831st uw4 887 59 1ms 29 Aug 2020 831st janbehrens 🇩🇪 887 59 1ms 22 May 2021 831st lynn 887 59 1ms 2 Oct 2021 831st simon-biber 887 59 1ms 7 Feb 2022 831st LorenzoDeGaspari 887 59 2ms 20 Jun 2022 831st solmyr2000 887 59 1ms 21 Jun 2022 831st AlephSquirrel 887 59 1ms 18 Jul 2022 831st Alex-x90 🇺🇸 887 59 2ms 24 Nov 2022 831st annaproxy 887 59 1ms 8 Jan 2023 831st b10011 🇫🇮 887 59 1ms 8 Jan 2023 831st orthoplex 🇨🇽 887 59 1ms 14 Jun 2024 831st yanjs 887 59 1ms 5 Jul 2025 831st luuumine 🇫🇷 887 59 1ms 29 Oct 2025 831st FoxInTheClouds 887 59 2ms 18 Feb 2026 846th janbehrens 🇩🇪 886 38 346ms 1 Nov 2021 846th MeWhenI 🇻🇦 886 38 312ms 25 Nov 2022 848th villfa 886 50 4ms 27 May 2019 848th UpwardProcess 886 50 5ms 30 Jul 2019 848th ondras 886 50 5ms 3 May 2020 848th cywong-amino 🇭🇰 886 50 4ms 20 May 2020 848th Attero 🇸🇪 886 50 5ms 31 Aug 2020 848th sisyphus-ppcg 🇦🇺 886 50 4ms 5 Nov 2020 848th toubsen 🇩🇪 886 50 5ms 26 Dec 2020 855th CaedenHarper 🇨🇦 886 90 290ms 12 Nov 2025 856th lynn 884 32 3ms 26 Mar 2021 856th perlebach 🇨🇿 884 32 3ms 13 Aug 2021 856th Steffan153 🇫🇮 884 32 3ms 24 Feb 2023 856th sean-niemann 🇺🇸 884 32 3ms 13 Mar 2025 860th yanjs 884 53 119ms 3 Jul 2025 861st GrayJoKing 🇦🇺 884 57 4ms 16 Jul 2023 862nd Steffan153 🇫🇮 884 61 15ms 22 Aug 2024 863rd daniel-skalik 🇨🇿 884 64 364ms 21 Nov 2021 863rd fleischa 884 64 368ms 21 Nov 2021 863rd Kloppermand 🇩🇰 884 64 349ms 21 Nov 2021 863rd p-vf 🇨🇭 884 64 356ms 21 Nov 2021 863rd raphaelimahorn 884 64 381ms 21 Nov 2021 863rd revlayle 🇺🇸 884 64 361ms 21 Nov 2021 863rd roavin 884 64 359ms 5 Jul 2022 863rd dteague3989 884 64 355ms 26 May 2023 863rd Decrare 884 64 364ms 12 Sep 2025 863rd Andrey2001 884 64 399ms 26 Nov 2025 873rd prplz 🇦🇺 883 48 16ms 19 Sep 2019 873rd TFeld00 🇩🇰 883 48 10ms 3 Mar 2020 873rd GolfingSuccess 🇬🇷 883 48 15ms 17 Nov 2020 873rd urojony 🇵🇱 883 48 21ms 26 Dec 2020 873rd btjones0 883 48 17ms 30 Dec 2020 873rd Indivicivet 883 48 17ms 22 Mar 2021 873rd NewDefectus 🇮🇱 883 48 16ms 27 May 2021 873rd Bubbler-4 883 48 9ms 16 Nov 2021 First Prev 801–880 of 4,879 Next Last