The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 29 hours. Why not try and solve them ahead of time?
Fibonacci in all languages 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 527th KasperKivimaeki 🇫🇮 961 43 2ms 8 Dec 2025 527th aadenboy 🇺🇸 961 43 1ms 16 Dec 2025 527th JesseNoEyes 🇺🇸 961 43 2ms 15 Jan 2026 527th FranklinJiaChen 961 43 2ms 15 Feb 2026 527th aksyristos 961 43 2ms 4 hours ago 646th Lydxn 🇨🇦 961 69 62ms 1 Jan 2022 646th prplz 🇦🇺 961 69 64ms 1 Jan 2022 646th JayXon 🇺🇸 961 69 58ms 2 Jan 2022 646th sean-niemann 🇺🇸 961 69 62ms 2 Jan 2022 646th sisyphus-ppcg 🇦🇺 961 69 60ms 2 Jan 2022 646th nwellnhof 🇩🇪 961 69 68ms 2 Jan 2022 646th m-tkach 🇺🇦 961 69 59ms 2 Jan 2022 646th Irratix 🇳🇱 961 69 74ms 3 Jan 2022 646th SirBogman 🇺🇸 961 69 61ms 3 Jan 2022 646th GrayJoKing 🇦🇺 961 69 66ms 4 Jan 2022 646th btnlq 961 69 56ms 4 Jan 2022 646th primo-ppcg 🇹🇭 961 69 69ms 18 Jan 2022 646th inventshah 961 69 57ms 19 Jan 2022 646th MeWhenI 🇻🇦 961 69 62ms 8 May 2022 646th shellbertt 🇨🇦 961 69 56ms 9 May 2022 646th jared-hughes 961 69 69ms 20 Jul 2022 646th Shanethegamer 🇺🇸 961 69 57ms 27 Aug 2022 646th Steffan153 🇫🇮 961 69 63ms 1 Oct 2022 646th Alex-x90 🇺🇸 961 69 69ms 17 Oct 2022 646th qwertyuiop3 🇷🇺 961 69 62ms 20 Oct 2022 646th Seek64 🇩🇪 961 69 55ms 11 Nov 2022 646th janbehrens 🇩🇪 961 69 57ms 20 Nov 2022 646th astdefu 961 69 66ms 8 Dec 2022 646th DialFrost 🇸🇬 961 69 61ms 12 Dec 2022 646th syntax-rules 961 69 67ms 25 Dec 2022 646th ayushdewan 961 69 59ms 2 Jan 2023 646th Betuaredead 961 69 62ms 4 Jan 2023 646th Yewzir 🇧🇪 961 69 60ms 3 Feb 2023 646th CatsAreFluffy 961 69 56ms 18 Feb 2023 646th snyderek 🇺🇸 961 69 62ms 11 Mar 2023 646th xsot 🇸🇬 961 69 59ms 21 May 2023 646th ovs-code 🇩🇪 961 69 62ms 3 Oct 2023 646th fuzzylojik-golf 🇺🇸 961 69 57ms 21 Oct 2023 646th FlyingPenguin223 961 69 58ms 1 Nov 2023 646th GolfingSuccess 🇬🇷 961 69 57ms 3 Nov 2023 646th Herbert00709 🇵🇱 961 69 59ms 10 Nov 2023 646th roupiq 🇵🇱 961 69 59ms 10 Nov 2023 646th drabart 🇵🇱 961 69 64ms 11 Dec 2023 646th kkoenig 961 69 60ms 22 Dec 2023 646th byronknoll 🇺🇸 961 69 56ms 6 Feb 2024 646th Mandrzejy 🇵🇱 961 69 58ms 4 Mar 2024 646th error256 961 69 62ms 27 May 2024 646th jipsong 🇩🇪 961 69 65ms 27 Jun 2024 646th Jacob385 961 69 57ms 31 Jul 2024 646th pardouin 🇫🇷 961 69 62ms 19 Oct 2024 646th dodecahedron6291 961 69 61ms 3 Nov 2024 646th 09cf 961 69 61ms 16 Dec 2024 646th yeminghan2021 961 69 64ms 1 Feb 2025 646th KasperKivimaeki 🇫🇮 961 69 61ms 24 Mar 2025 646th b-illy 🇬🇧 961 69 59ms 31 May 2025 646th joaosigma 🇵🇹 961 69 61ms 12 Jul 2025 646th rucin93 🇵🇱 961 69 58ms 23 Jul 2025 646th gusrod-coder 961 69 60ms 19 Sep 2025 646th Yax42 🇫🇷 961 69 59ms 4 Oct 2025 646th AdrienHache 🇫🇷 961 69 59ms 6 Oct 2025 646th snoozingnewt 🇨🇦 961 69 57ms 24 Oct 2025 646th luuumine 🇫🇷 961 69 61ms 30 Oct 2025 646th Languag3 961 69 60ms 18 Dec 2025 646th edsrzf 🇳🇿 961 69 56ms 2 days ago 705th kmaork 🇮🇱 960 37 9ms 18 Apr 2018 705th edre 960 37 10ms 2 May 2018 705th tjtnorton 960 37 10ms 8 Nov 2018 705th PawaritL 960 37 10ms 28 Jan 2019 705th PFischbeck 960 37 9ms 2 Aug 2019 705th hoodadam 960 37 9ms 25 Oct 2019 705th CyberTapir 960 37 9ms 29 Jul 2020 705th McAidan99 960 37 10ms 29 Jul 2020 705th obamaman360 960 37 9ms 29 Jul 2020 705th PhonicCanine 960 37 9ms 1 Aug 2020 705th BBoehm 🇩🇪 960 37 10ms 8 Dec 2020 705th neihousaigaai 960 37 10ms 8 May 2021 705th jacklynnepenick 960 37 9ms 13 Aug 2021 705th jrm5399 🇰🇿 960 37 9ms 31 Jan 2022 705th mathisfun271 960 37 9ms 5 Mar 2022 705th Nicronmil 960 37 9ms 22 Nov 2022 First Prev 641–720 of 9,854 Next Last