The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
Fibonacci 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 1st AdrienHache 🇫🇷 1,000 36 9ms 17 Dec 2025 1st Emutis 🇱🇹 1,000 36 10ms 12 Jan 2026 1st FoxInTheClouds 1,000 36 9ms 15 Feb 2026 1st plcc0 1,000 36 10ms 6 days ago 1st aksyristos 1,000 36 10ms 2 hours ago 166th kmaork 🇮🇱 973 37 9ms 18 Apr 2018 166th edre 973 37 10ms 2 May 2018 166th tjtnorton 973 37 10ms 8 Nov 2018 166th PawaritL 973 37 10ms 28 Jan 2019 166th PFischbeck 973 37 9ms 2 Aug 2019 166th hoodadam 973 37 9ms 25 Oct 2019 166th CyberTapir 973 37 9ms 29 Jul 2020 166th McAidan99 973 37 10ms 29 Jul 2020 166th obamaman360 973 37 9ms 29 Jul 2020 166th PhonicCanine 973 37 9ms 1 Aug 2020 166th BBoehm 🇩🇪 973 37 10ms 8 Dec 2020 166th neihousaigaai 973 37 10ms 8 May 2021 166th jacklynnepenick 973 37 9ms 13 Aug 2021 166th jrm5399 🇰🇿 973 37 9ms 31 Jan 2022 166th mathisfun271 973 37 9ms 5 Mar 2022 166th Nicronmil 973 37 9ms 22 Nov 2022 166th CatsAreFluffy 973 37 9ms 18 Feb 2023 166th cesarm4 973 37 9ms 30 Apr 2023 166th AlexanderFair 973 37 9ms 29 Jun 2023 166th nyoshe 973 37 11ms 10 Oct 2023 166th Grrisly 973 37 9ms 9 Nov 2023 166th 5cw 🇺🇸 973 37 9ms 13 Jul 2024 166th Zounon 973 37 11ms 18 Sep 2025 166th hellopir2 973 37 10ms 11 Oct 2025 166th Coolbeansyeah 973 37 11ms 18 Feb 2026 191st lmeuser 947 38 11ms 2 Dec 2017 191st zdzc 947 38 9ms 8 Dec 2017 191st michael-celani 947 38 9ms 30 Dec 2017 191st kevinmchung 947 38 10ms 10 Jan 2018 191st ssilwa 947 38 11ms 18 Jan 2018 191st clfs 947 38 9ms 22 Jan 2018 191st mhgump-zz 947 38 10ms 29 Jan 2018 191st Constructor7 947 38 9ms 14 Feb 2018 191st temich-nosov 947 38 11ms 18 Feb 2018 191st ProtD 947 38 9ms 27 Feb 2018 191st lverweijen 947 38 10ms 17 Mar 2018 191st blakehurlburt 947 38 10ms 20 Mar 2018 191st Florob 947 38 10ms 1 Apr 2018 191st yevbar 947 38 10ms 7 Apr 2018 191st khuldraeseth 947 38 10ms 10 Apr 2018 191st Mr-Xcoder 947 38 10ms 11 Apr 2018 191st user202729 947 38 10ms 11 Apr 2018 191st justecorruptio 947 38 10ms 13 Apr 2018 191st yokasuretsu 947 38 9ms 13 Apr 2018 191st fclaude 947 38 9ms 13 Apr 2018 191st caerbannogwhite 947 38 9ms 14 Apr 2018 191st MichaHoffmann 947 38 11ms 16 Apr 2018 191st martica 947 38 9ms 19 May 2018 191st pedrotpa 947 38 10ms 20 May 2018 191st Everlone 947 38 9ms 27 May 2018 191st AriaOutten 947 38 11ms 27 May 2018 191st mkillianey 947 38 10ms 18 Jun 2018 191st retrohun 947 38 10ms 25 Jun 2018 191st jslip 947 38 10ms 19 Jul 2018 191st 0jdxt 947 38 11ms 28 Jul 2018 191st Faweks1 947 38 9ms 31 Jul 2018 191st DaleNaci 947 38 9ms 9 Aug 2018 191st evelyn-fu 947 38 10ms 9 Aug 2018 191st relet 947 38 10ms 9 Aug 2018 191st msrawson 947 38 10ms 10 Aug 2018 191st Sora-the-explora 947 38 10ms 12 Aug 2018 191st Peter-Lande 947 38 10ms 12 Aug 2018 191st CRHillman 947 38 9ms 16 Aug 2018 191st ArturLange 947 38 10ms 31 Aug 2018 191st rollershutter 947 38 9ms 6 Sep 2018 191st newdemian 947 38 10ms 17 Sep 2018 191st raphael-sch 947 38 9ms 24 Sep 2018 191st stevelamm 947 38 11ms 5 Oct 2018 191st Starwort 🇬🇧 947 38 11ms 17 Nov 2018 191st tkwa 947 38 9ms 5 Dec 2018 191st PrettyWood 947 38 10ms 7 Dec 2018 191st bkshrader 947 38 9ms 29 Dec 2018 191st SimonPeatman 947 38 10ms 29 Dec 2018 191st rory660 947 38 10ms 2 Jan 2019 191st ly0va 947 38 9ms 2 Jan 2019 First Prev 161–240 of 2,095 Next Last