The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 days. Why not try and solve them ahead of time?
Day of Week 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 160th jamopher 716 95 22ms 6 Nov 2023 162nd Poehavshi 708 96 14ms 26 Jun 2023 162nd kurkale6ka 708 96 14ms 19 Nov 2023 162nd chartung17 708 96 15ms 17 Dec 2023 162nd jbjd 708 96 15ms 19 Feb 2024 162nd msrawsonwork 708 96 15ms 1 Mar 2024 162nd Grrisly 708 96 16ms 25 Mar 2024 162nd yuchuehw 708 96 13ms 13 May 2024 162nd tomh1012 708 96 13ms 20 Feb 2026 170th juliusgeo 701 97 24ms 19 Apr 2023 170th Just4FunCoder 701 97 14ms 27 Oct 2023 170th Aquateraneal 🇺🇸 701 97 19ms 21 days ago 173rd ssbhatt4321 694 98 14ms 11 Jun 2023 173rd hiichbindermax 694 98 14ms 27 Jul 2024 173rd denisfouchard 694 98 13ms 23 Aug 2025 173rd vhoulbreque 🇫🇷 694 98 22ms 4 Dec 2025 177th TaserTheFox 🇺🇸 687 99 19ms 17 Apr 2023 177th ehulinsky 🇺🇸 687 99 21ms 10 May 2023 177th minhtrancccp 687 99 19ms 1 Nov 2023 177th roguh 🇬🇹 687 99 18ms 22 Jan 2024 177th namelessiw 687 99 14ms 21 Feb 2024 177th jtaxen 687 99 18ms 22 Mar 2024 177th christensendaniel 687 99 15ms 14 May 2024 177th abhishekg999 687 99 33ms 22 Sep 2024 177th moustave 687 99 15ms 7 Jan 2025 177th sciencejiho 687 99 14ms 10 Feb 2025 177th 0dyse 687 99 19ms 15 Apr 2025 177th Voltrifrodec 🇸🇰 687 99 15ms 27 Apr 2025 177th CoolBvll 687 99 19ms 10 Jul 2025 177th michelebastione 🇮🇹 687 99 15ms 6 Aug 2025 177th jacekwladzinski 687 99 14ms 4 Oct 2025 177th Matter1024 🇮🇳 687 99 15ms 27 days ago 193rd OCNeve 680 100 18ms 18 Jun 2024 194th uttumuttu 🇫🇮 673 101 14ms 22 Dec 2023 194th jameswmccarty 673 101 13ms 6 Mar 2025 196th Natanaelel 🇸🇪 667 102 14ms 18 Apr 2023 196th VV1Git 667 102 14ms 19 Apr 2023 196th sbatllori 667 102 24ms 25 Aug 2023 196th itsrenderman 667 102 23ms 30 Sep 2023 196th pde-bakk 🇳🇱 667 102 24ms 23 Oct 2023 196th ktanaka 667 102 14ms 11 Jan 2024 196th Krtecik 667 102 23ms 9 Feb 2024 196th qwjhvbxi 667 102 23ms 9 Feb 2024 196th pkilar43 667 102 23ms 9 Feb 2024 196th Trusly 667 102 23ms 27 Feb 2024 196th NoneTheFewer 667 102 21ms 17 May 2024 196th FranklinJiaChen 667 102 23ms 1 Jul 2024 196th lchaumartin 667 102 23ms 22 Aug 2024 196th alemelis 667 102 23ms 13 Sep 2024 196th ComputerKWasTaken 🇺🇸 667 102 21ms 24 Sep 2024 196th codewrite 🇬🇧 667 102 22ms 19 Apr 2025 196th kistlerf 🇨🇭 667 102 23ms 14 May 2025 196th ffelixm 667 102 23ms 1 Jun 2025 196th Andrey2001 667 102 37ms 26 Nov 2025 215th MichalMarsalek 🇨🇿 660 103 14ms 16 Apr 2023 215th adamnielson42 🇺🇸 660 103 20ms 4 May 2023 215th NickTheEASDude 🇺🇸 660 103 14ms 29 Jan 2024 215th CutSandstone 660 103 14ms 4 Jul 2024 215th NanduBC 660 103 23ms 3 Sep 2024 215th FEZfan 🇦🇺 660 103 25ms 18 Apr 2025 215th TheZwierzLF 🇵🇱 660 103 15ms 21 Nov 2025 222nd OllieBoyne 🇬🇧 654 104 23ms 17 Apr 2023 222nd Eilonlif 🇮🇱 654 104 22ms 17 Apr 2023 222nd Ripick 654 104 24ms 12 May 2023 222nd eddvrs 654 104 23ms 18 May 2023 222nd fbe 654 104 23ms 26 May 2023 222nd Wildst 654 104 15ms 6 Jul 2023 222nd cefqrn 654 104 27ms 1 Nov 2023 222nd bsoyka 🇺🇸 654 104 23ms 25 Nov 2023 222nd neihousaigaai 654 104 23ms 11 Feb 2024 222nd wilhelmines 654 104 15ms 1 Jun 2024 222nd jiaminglimjm 🇲🇾 654 104 21ms 5 Jul 2024 222nd JesseNoEyes 🇺🇸 654 104 15ms 18 Sep 2024 222nd Rago-Tony 654 104 23ms 11 Jul 2025 235th bbnumber2 648 105 15ms 29 Oct 2023 235th PowershellKnut 🇳🇴 648 105 24ms 7 Jan 2024 235th samual-hain 648 105 23ms 4 Apr 2024 235th jastrzumb 648 105 14ms 3 Jan 2025 235th robin-scragg 648 105 18ms 6 Jul 2025 240th imoxyg 642 106 22ms 29 Aug 2025 First Prev 161–240 of 327 Next Last
