The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 days. Why not try and solve them ahead of time?
Foo Fizz Buzz Bar in Python in chars. 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 Chars Time Submitted 313th Mabeloid 🇳🇴 742 89 11ms 18 Sep 2024 313th jamiloBBKing 742 89 12ms 27 Jan 2025 313th Pyroan 742 89 12ms 12 Mar 2025 313th robin-scragg 742 89 12ms 11 Jun 2025 313th davidludwik2370 742 89 12ms 24 Jul 2025 313th cros107 🇦🇺 742 89 11ms 1 Nov 2025 313th kitotch 742 89 11ms 12 days ago 328th peterprescott 733 90 12ms 22 Nov 2021 328th knutae 🇳🇴 733 90 12ms 25 Nov 2021 328th RDShah 733 90 11ms 25 Nov 2021 328th sbr075 733 90 13ms 7 Dec 2021 328th CedricGebistorf 733 90 12ms 24 Feb 2022 328th hiichbindermax 733 90 11ms 26 Feb 2022 328th LHuitre 733 90 11ms 15 Apr 2022 328th alex-costea 733 90 11ms 15 Apr 2022 328th Indivicivet 733 90 11ms 9 May 2022 328th AGoyet 733 90 11ms 11 Jul 2022 328th galloj 🇨🇿 733 90 11ms 16 Aug 2022 328th Yareeeema 733 90 11ms 18 Aug 2022 328th jfallon1997 733 90 11ms 6 Sep 2022 328th MaxElf999 733 90 11ms 3 Oct 2022 328th TheBlupper 733 90 11ms 3 Oct 2022 328th ValentinCassayre 733 90 11ms 9 Oct 2022 328th Omega65536 🇩🇪 733 90 12ms 22 Nov 2022 328th jacksonhenry3 733 90 11ms 2 Dec 2022 328th Techdude01 733 90 11ms 17 Dec 2022 328th M0PKOBKA 733 90 11ms 26 Dec 2022 328th NOS4A5I 733 90 12ms 30 Dec 2022 328th CheeseCake628 🇳🇴 733 90 12ms 20 Jan 2023 328th TheGlitcher1705 733 90 39ms 16 Mar 2023 328th dranjohn 733 90 12ms 16 Sep 2023 328th pde-bakk 🇳🇱 733 90 12ms 23 Oct 2023 328th NickTheEASDude 🇺🇸 733 90 11ms 15 Nov 2023 328th doktoren 733 90 12ms 10 Dec 2023 328th Chimplement 733 90 11ms 13 Dec 2023 328th epic-programmer-guy 733 90 11ms 31 Dec 2023 328th OCNeve 733 90 11ms 18 Jun 2024 328th CutSandstone 733 90 42ms 4 Jul 2024 328th martion2007 733 90 10ms 15 Aug 2024 328th alemelis 733 90 12ms 1 Oct 2024 328th rozium 733 90 12ms 11 Oct 2024 328th WCScrypto-official 733 90 11ms 22 Dec 2024 328th Alithinar 733 90 12ms 15 May 2025 328th LuisGoncalves05 🇵🇹 733 90 12ms 9 Jul 2025 328th ESOrSomething 733 90 40ms 26 Sep 2025 328th jacekwladzinski 733 90 12ms 2 Oct 2025 328th SectorCorruptor 733 90 11ms 10 Feb 2026 328th mailboxjpg 733 90 11ms 26 Feb 2026 369th PyPylia 🇦🇺 725 91 11ms 25 Nov 2021 369th EzraG101 725 91 11ms 26 Nov 2021 369th fynnkroeger 725 91 12ms 5 Dec 2021 369th olavaga 725 91 12ms 8 Dec 2021 369th petroselo 725 91 12ms 27 Dec 2021 369th Puperger 725 91 11ms 29 Dec 2021 369th raketexyz 725 91 11ms 29 Dec 2021 369th neburcraft 725 91 43ms 30 Dec 2021 369th QuincyNash 🇺🇸 725 91 14ms 20 Jan 2022 369th amollberg 🇸🇪 725 91 12ms 25 Jan 2022 369th shibacho 🇯🇵 725 91 10ms 29 Jan 2022 369th kyleclaassen 725 91 11ms 8 Feb 2022 369th DaleNaci 725 91 12ms 27 Mar 2022 369th twocatsinatrenchcoat 725 91 11ms 4 May 2022 369th ophact 725 91 12ms 22 May 2022 369th AdamHe17 725 91 12ms 1 Jun 2022 369th AliceFord 725 91 48ms 2 Jun 2022 369th bbakersmith 725 91 46ms 6 Jun 2022 369th nullie 725 91 12ms 8 Jun 2022 369th juan-cazalvilla 725 91 12ms 26 Jun 2022 369th markovist 725 91 43ms 16 Aug 2022 369th AodhanDalton 725 91 12ms 2 Sep 2022 369th shinylego 725 91 11ms 14 Sep 2022 369th richard-oelze 🇩🇪 725 91 10ms 16 Sep 2022 369th murugan-k-0204 725 91 11ms 5 Oct 2022 369th bobhope44 725 91 47ms 8 Oct 2022 369th mhorton86 725 91 11ms 11 Oct 2022 369th no53488 725 91 11ms 28 Nov 2022 369th tooningelaere 725 91 11ms 3 Dec 2022 369th jumelet 🇳🇱 725 91 11ms 21 Dec 2022 369th badboj40 725 91 11ms 26 Dec 2022 369th faraz-t 725 91 11ms 17 Feb 2023 First Prev 321–400 of 880 Next Last