The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?
Foo Fizz Buzz Bar in Python 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 552nd Alex-Huggett 🇬🇧 755 110 41ms 23 Oct 2024 552nd ahmedshifathedataengineer 755 110 11ms 19 Sep 2025 563rd mathb0y512 748 111 12ms 29 Nov 2022 563rd BLD933 🇲🇦 748 111 11ms 1 Sep 2023 563rd HelloYuiYui 748 111 11ms 31 Oct 2023 563rd Igyeom 🇰🇷 748 111 18ms 5 Feb 2024 567th LeeCamp 741 112 11ms 11 Dec 2021 567th andrewgopher 741 112 11ms 25 Jun 2022 567th avinashv 741 112 11ms 12 Nov 2022 567th Webatron11 741 112 11ms 24 Nov 2022 567th S-Ruban 741 112 9ms 25 Feb 2023 567th Florian-Mt 741 112 11ms 26 Sep 2023 567th sli-Lut 741 112 12ms 11 Oct 2023 567th b20fuji 741 112 12ms 18 Oct 2023 567th PyryL 🇫🇮 741 112 12ms 21 Aug 2024 576th ArmaanAS 735 113 19ms 28 Nov 2021 576th oomido 735 113 11ms 7 Sep 2022 576th DayDun 🇸🇪 735 113 13ms 21 Jan 2023 576th djtroyal 735 113 12ms 13 Feb 2023 576th msbranicky 735 113 18ms 5 Jul 2023 576th 2011-Chan-Ethan 735 113 12ms 19 Jul 2023 576th khavik 735 113 12ms 18 May 2024 576th MamoonUddin 735 113 11ms 3 Dec 2024 576th Hyperoplex145 735 113 12ms 10 Nov 2025 585th Andrey135296 728 114 12ms 3 Jan 2022 585th Liastrae 728 114 11ms 22 Aug 2022 585th Nicronmil 728 114 12ms 25 Nov 2022 585th zwxzwxzwx21 728 114 11ms 24 Jan 2024 585th aliberro39109 728 114 12ms 1 Sep 2025 590th dzshn 722 115 18ms 17 Aug 2022 590th dillon-duncando 722 115 11ms 5 Oct 2022 590th tinyattila 722 115 12ms 7 Oct 2022 590th tails618 722 115 18ms 1 Dec 2022 590th Azearia 722 115 11ms 23 Oct 2023 590th VictorStenvers 🇳🇱 722 115 11ms 25 Apr 2024 590th mishak-sys 722 115 11ms 24 Feb 2025 590th WillowWispy 722 115 11ms 16 Mar 2025 590th Cube14yt 722 115 17ms 12 Oct 2025 599th TobyBoyne 🇬🇧 716 116 12ms 28 Jan 2022 599th hellwue 716 116 12ms 25 Feb 2022 599th HallMatthew314 716 116 17ms 15 Sep 2022 599th Pena86 716 116 12ms 16 Sep 2022 599th pricemat 716 116 12ms 11 Oct 2023 599th cmccandless 716 116 12ms 16 Oct 2023 599th m42km 716 116 12ms 25 Oct 2023 599th nhausspiegel 716 116 12ms 11 Apr 2024 599th resoNathan 716 116 11ms 25 Apr 2024 608th hellomath010118 709 117 10ms 26 Nov 2021 608th pengu1n-master 709 117 12ms 10 Dec 2021 608th Roboprod 709 117 13ms 24 Aug 2022 608th roguh 🇬🇹 709 117 11ms 7 Jan 2024 608th Masttest 709 117 12ms 31 Jan 2024 608th smilesformiles3 709 117 11ms 12 Jun 2025 614th init-jay 703 118 66ms 10 Aug 2022 614th fenix-bear 703 118 11ms 6 Jul 2023 614th jameswmccarty 703 118 11ms 9 Oct 2024 614th Googolplexo 🇷🇺 703 118 12ms 42 hours ago 618th VilBoub 697 119 18ms 20 Apr 2022 618th julienlamoureux78 697 119 12ms 12 Aug 2022 618th za3k 697 119 12ms 12 Oct 2022 618th ozzypossie 697 119 12ms 24 May 2023 618th odelo 697 119 12ms 12 Oct 2023 618th rustykitty 🇺🇸 697 119 19ms 24 Oct 2025 624th nmgetahun 692 120 11ms 9 Dec 2022 624th Natz12 692 120 11ms 12 Jan 2023 624th AdamMorris377 692 120 11ms 22 Sep 2024 624th Mathrew2012 692 120 11ms 9 Nov 2024 624th Code-Coder-coder 692 120 11ms 11 Oct 2025 629th puffertron 686 121 10ms 31 Aug 2023 629th Loag 686 121 11ms 22 Sep 2024 631st TimLeffke 680 122 11ms 17 Aug 2022 631st KianShah 680 122 11ms 29 Mar 2023 631st OrangeBacon 680 122 12ms 31 Jul 2024 631st robin-scragg 680 122 12ms 20 Jun 2025 631st Teeqy 680 122 12ms 19 Feb 2026 636th gitbedd 🇬🇧 675 123 11ms 11 Jan 2022 636th eiburns 675 123 66ms 23 Jan 2023 636th Vaekor 675 123 65ms 9 Jul 2023 636th midnattssol 🇸🇪 675 123 12ms 27 Jul 2023 636th Eulentier161 675 123 18ms 30 Aug 2023 First Prev 561–640 of 879 Next Last