The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 days. Why not try and solve them ahead of time?
Ordinal Numbers 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 230th SoliGhost 762 105 13ms 11 Jun 2025 242nd Starwort 🇬🇧 755 106 19ms 14 Aug 2019 242nd sambirnbaum1 755 106 13ms 13 Oct 2019 242nd derekthatcher 755 106 12ms 22 Sep 2020 242nd tpaxman 🇨🇦 755 106 12ms 10 Dec 2020 242nd lmolteno 755 106 13ms 9 Mar 2021 242nd chartung17 755 106 13ms 1 Jan 2024 242nd inverseLorentz 🇦🇺 755 106 12ms 22 May 2024 242nd JunkIce 755 106 19ms 23 Sep 2024 242nd Rubiksmath 755 106 13ms 29 Sep 2024 242nd tomh1012 755 106 19ms 25 Feb 2026 252nd danielwang5 748 107 19ms 1 Aug 2020 252nd markusgraube 748 107 12ms 11 Apr 2023 252nd BREMAUCY 🇫🇷 748 107 13ms 25 May 2023 252nd midnattssol 🇸🇪 748 107 12ms 27 Jul 2023 256th adoxography 741 108 13ms 16 Sep 2019 256th SB-945 741 108 20ms 30 Aug 2023 256th kbeat 🇰🇿 741 108 19ms 5 Jun 2025 259th vonKrafft 734 109 12ms 24 Mar 2020 259th geofft 734 109 12ms 11 Dec 2020 259th cbondurant 734 109 19ms 5 May 2021 259th j-Ewan 734 109 21ms 2 Mar 2022 259th nstearns96 🇬🇧 734 109 20ms 29 Nov 2022 259th jipsong 🇩🇪 734 109 17ms 22 Jun 2025 265th SpeedyNinja 727 110 20ms 21 Oct 2020 265th zbreit 🇺🇸 727 110 20ms 16 Aug 2021 265th lovernj 727 110 14ms 21 Jan 2022 265th PhysicDev 🇫🇷 727 110 12ms 17 Mar 2022 265th MichaelMBradley 🇨🇦 727 110 12ms 9 Apr 2022 265th jettdc 727 110 12ms 4 Dec 2022 265th MichalMarsalek 🇨🇿 727 110 13ms 31 Jan 2023 265th elgan65536 🇺🇸 727 110 19ms 30 Mar 2024 265th RedzGoose 🇦🇺 727 110 13ms 18 Oct 2024 265th wh3n3v3r 🇨🇿 727 110 13ms 14 Nov 2024 265th mishak-sys 727 110 19ms 24 Feb 2025 276th TobyBoyne 🇬🇧 721 111 13ms 1 Aug 2019 276th doug-h 721 111 12ms 29 May 2020 276th suwat513 721 111 12ms 20 Sep 2022 276th eiburns 721 111 13ms 21 Jan 2023 276th Vaekor 721 111 13ms 9 Jul 2023 276th Mikey-Beep 🇬🇧 721 111 12ms 24 Aug 2023 276th PyryL 🇫🇮 721 111 12ms 26 Aug 2024 276th SectorCorruptor 721 111 13ms 8 Feb 2026 284th richard-oelze 🇩🇪 714 112 19ms 17 Jan 2021 284th martinnorling 🇸🇪 714 112 19ms 9 Mar 2022 284th ImpressedByRocks 714 112 33ms 11 Mar 2025 284th ffelixm 714 112 20ms 27 May 2025 284th TheZwierzLF 🇵🇱 714 112 13ms 8 Dec 2025 289th jotslo 🇬🇧 708 113 12ms 12 Jul 2019 289th anominos 708 113 19ms 14 Dec 2019 289th bastienvoirin 🇫🇷 708 113 19ms 8 Apr 2020 289th dpasionek 708 113 20ms 2 Oct 2020 289th Y0UR-U5ERNAME 708 113 19ms 5 Sep 2021 289th maddenfederico 708 113 12ms 29 Jan 2022 289th mbittner20 708 113 12ms 27 May 2023 289th Emutis 🇱🇹 708 113 12ms 10 Oct 2024 289th bpharaldsson 708 113 19ms 6 Feb 2026 298th kinoute 🇫🇷 702 114 18ms 12 Sep 2021 298th BrenSchaap 702 114 14ms 21 Oct 2021 298th wirewolf010 702 114 13ms 4 Jan 2022 298th rollershutter 702 114 19ms 23 Jun 2023 302nd ay2718 696 115 19ms 12 Aug 2019 302nd pascscha 696 115 19ms 28 Mar 2022 302nd Zach10za 696 115 20ms 17 Nov 2022 302nd mothcolada 🇺🇸 696 115 22ms 5 Jul 2025 306th ydevor 🇮🇱 690 116 14ms 30 Nov 2020 306th vhoulbreque 🇫🇷 690 116 13ms 20 Aug 2022 306th HelloYuiYui 690 116 12ms 31 Oct 2023 306th Andrey2001 690 116 20ms 31 Jan 2026 310th amishtal 684 117 19ms 2 Dec 2019 310th b4dpxl 684 117 12ms 4 Dec 2019 310th schachmattmatt 684 117 19ms 11 Aug 2021 310th QuincyNash 🇺🇸 684 117 21ms 1 Dec 2022 310th celiendonze 🇨🇭 684 117 13ms 25 Apr 2023 310th 1231234md5 🇨🇳 684 117 19ms 13 Dec 2023 310th tejapvk 684 117 12ms 19 Jun 2025 317th notofyourinterest 678 118 13ms 13 Feb 2021 317th AtengChen 678 118 19ms 14 Aug 2024 319th handisb 672 119 12ms 11 Feb 2020 319th Ekan5h 672 119 17ms 29 Mar 2020 First Prev 241–320 of 473 Next Last
