The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 8 days. Why not try and solve them ahead of time?
Arabic to Roman 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 156th Josemnz 685 181 23ms 4 May 2025 162nd Alex-x90 🇺🇸 681 182 47ms 13 Feb 2023 162nd cefqrn 681 182 29ms 20 May 2023 162nd jeff-at-tamer-dot-codes 🇺🇸 681 182 20ms 8 Sep 2023 162nd fgrosshans 🇫🇷 681 182 22ms 16 Jul 2024 166th skps2010 678 183 21ms 31 Dec 2018 166th asheeri 678 183 22ms 14 Aug 2021 166th TaserTheFox 🇺🇸 678 183 24ms 8 May 2023 169th adoxography 674 184 21ms 10 Oct 2019 169th mokymok 🇺🇸 674 184 29ms 8 Dec 2021 169th jakobkordez 🇸🇮 674 184 19ms 17 Oct 2022 169th yishayv 674 184 21ms 23 Jan 2023 169th Bmrl7 674 184 27ms 17 Feb 2024 169th jatloe 674 184 20ms 5 Oct 2024 175th nsprd 670 185 25ms 19 Jan 2024 175th DxSper 670 185 34ms 16 Feb 2024 175th driri85 670 185 30ms 16 Feb 2024 175th OCNeve 670 185 19ms 18 Jun 2024 175th croc54 670 185 21ms 31 Jan 2025 175th Alpha9584 670 185 20ms 20 Mar 2025 175th Hemanthred2005 670 185 25ms 3 May 2025 175th GodlyProgrammer1 670 185 25ms 28 Nov 2025 183rd TheAristos 667 186 30ms 21 Oct 2019 183rd CorporalCrawdad 667 186 21ms 3 Oct 2024 185th rowboat1 663 187 25ms 3 Apr 2021 185th rschwa6308 🇺🇸 663 187 66ms 18 Aug 2023 185th albanian-laundromat 663 187 21ms 24 Apr 2025 185th bogosorter 663 187 43ms 11 Jul 2025 185th celiendonze 🇨🇭 663 187 24ms 7 Nov 2025 190th kevinmchung 660 188 35ms 2 Feb 2018 190th jhfranklin 🇬🇧 660 188 25ms 7 Mar 2021 190th ehulinsky 🇺🇸 660 188 20ms 8 May 2023 190th eiburns 660 188 20ms 3 Oct 2023 190th Just4FunCoder 660 188 40ms 18 Jun 2025 195th ay2718 656 189 29ms 14 Aug 2019 195th Kloppermand 🇩🇰 656 189 21ms 10 Jun 2020 195th martinnorling 🇸🇪 656 189 23ms 3 Mar 2022 195th ThijsLuttikhuis 656 189 28ms 3 Mar 2024 195th tri1212 🇻🇳 656 189 598ms 30 Jun 2024 195th emgordon154 656 189 31ms 24 Sep 2024 195th Mathrew2012 656 189 17ms 24 May 2025 202nd LogicalJoe 653 190 34ms 24 May 2023 202nd moustave 653 190 31ms 7 Apr 2025 204th garrisonhh 649 191 20ms 21 Nov 2020 204th geofft 649 191 41ms 10 Dec 2020 204th CedricGebistorf 649 191 23ms 18 Feb 2022 204th Educorreia932 649 191 23ms 23 Jun 2022 204th Ripick 649 191 25ms 6 May 2023 204th anarconic 649 191 470ms 14 Dec 2023 204th jeff-re 649 191 22ms 6 May 2025 204th nemoyatpeace 649 191 26ms 8 Jan 2026 212th hellwue 646 192 22ms 22 Nov 2023 212th ballaire 646 192 40ms 27 Jan 2024 214th evanrittner 642 193 22ms 9 Mar 2019 214th argusdusty 🇺🇸 642 193 35ms 31 Dec 2020 214th Bonjour27891 🇻🇳 642 193 39ms 13 Mar 2022 214th AtengChen 642 193 23ms 16 Aug 2024 214th JunkIce 642 193 21ms 4 Nov 2024 219th Psirving 639 194 24ms 31 Jul 2020 219th j-Ewan 639 194 22ms 14 Feb 2022 219th Dandandooo 639 194 21ms 19 Apr 2025 222nd P-Quentin 🇫🇷 636 195 29ms 5 Aug 2022 222nd BREMAUCY 🇫🇷 636 195 21ms 4 Feb 2023 222nd cros107 🇦🇺 636 195 26ms 7 Jun 2023 222nd m42km 636 195 24ms 14 Jan 2024 222nd WillConker 636 195 20ms 10 Aug 2024 222nd Troon 636 195 21ms 19 Aug 2025 222nd zgialor-lab 636 195 27ms 23 days ago 229th wilkij1 633 196 19ms 16 Jun 2018 229th lukasthaler 633 196 24ms 9 Sep 2020 229th asadullayev 633 196 22ms 4 Mar 2021 229th geooff 633 196 22ms 11 Sep 2023 229th RaBa21 🇭🇺 633 196 22ms 17 Jul 2025 229th BlankSpruce 633 196 24ms 31 Aug 2025 235th BrenSchaap 629 197 21ms 21 Oct 2021 235th aksyristos 629 197 24ms 27 Jan 2023 235th ABC00012345 629 197 23ms 1 May 2024 235th michaelmgreer 629 197 22ms 9 Oct 2025 239th zdzc 626 198 23ms 26 Mar 2018 239th Florian-Mt 626 198 24ms 14 Nov 2023 First Prev 161–240 of 507 Next Last