The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 33 hours. Why not try and solve them ahead of time?
12 Days of Christmas 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 317th chenmingxiang110 402 473 9ms 19 Feb 2024 317th fuzzylojik-golf 🇺🇸 402 473 10ms 13 Jun 2025 317th wuduculfre 402 473 10ms 27 Jul 2025 317th hippalectryon-0 402 473 10ms 6 Dec 2025 317th nemoyatpeace 402 473 10ms 28 Dec 2025 317th OutWrest 402 473 10ms 9 hours ago 327th wazawoo 401 474 10ms 21 Oct 2018 327th EManLava 401 474 10ms 8 May 2020 327th Ellipsibus 401 474 10ms 2 Aug 2022 327th mosho-p 401 474 9ms 13 Oct 2022 327th yoka255 401 474 10ms 25 Mar 2023 327th mattf1n 401 474 10ms 25 Oct 2023 327th LuisGoncalves05 🇵🇹 401 474 10ms 18 Jul 2025 327th AstroOrbis 401 474 11ms 24 Nov 2025 335th lucadonini96 400 475 9ms 17 Apr 2020 335th Hydrophobefireman 400 475 10ms 17 Jul 2020 335th dourvaris 400 475 16ms 9 Aug 2020 335th DeFilippis 400 475 11ms 9 Feb 2021 335th cubed-guy 400 475 9ms 17 Oct 2021 335th Trunksistor 🇫🇷 400 475 10ms 21 Apr 2022 335th AbelPelser 400 475 10ms 2 Jul 2022 335th DaCuteRaccoon 400 475 9ms 1 Oct 2022 335th brochmann 🇸🇪 400 475 9ms 18 Oct 2022 335th thehylian 400 475 11ms 27 Dec 2022 335th jumelet 🇳🇱 400 475 9ms 2 Jan 2023 335th tvcv901 400 475 10ms 26 Feb 2023 335th dev-Thae 400 475 10ms 6 Nov 2023 335th rsgray 400 475 10ms 8 Jan 2024 335th yousefalizadeh 400 475 10ms 3 Oct 2024 335th CoolBvll 400 475 10ms 12 Jun 2025 335th Andrey2001 400 475 9ms 24 Nov 2025 352nd Sakaala 399 476 11ms 23 Apr 2019 352nd rowboat1 399 476 10ms 19 Jun 2022 352nd prestonfu 399 476 9ms 6 Jul 2022 352nd SocialFault 399 476 10ms 21 Aug 2022 352nd 0-4849 399 476 9ms 30 Oct 2022 352nd tsidwick 399 476 9ms 20 Dec 2023 352nd gabe-gallegos 399 476 11ms 30 Apr 2024 352nd imelxr 🇮🇱 399 476 9ms 16 Aug 2024 352nd jfallon1997 399 476 9ms 27 Sep 2024 352nd jan-Simiman 399 476 10ms 15 Oct 2024 352nd ocefra 399 476 9ms 31 Dec 2024 363rd alaaeelsayed 398 477 10ms 23 Jul 2018 363rd markus-rekdal 398 477 9ms 31 May 2019 363rd dymowski 398 477 9ms 17 Jul 2019 363rd streifenfrei 398 477 11ms 27 Jan 2021 363rd ArnaudGazda 398 477 9ms 2 Sep 2022 363rd lomaxo 398 477 10ms 16 Dec 2022 363rd LogicalJoe 398 477 10ms 5 Jan 2023 370th boxjelly 397 478 9ms 24 Feb 2021 370th pyrolitic 🇮🇪 397 478 11ms 5 Apr 2022 370th guilhem-roy 🇫🇷 397 478 10ms 31 Aug 2022 370th cros107 🇦🇺 397 478 9ms 26 Oct 2022 370th bobbysq 397 478 10ms 2 May 2023 370th msbranicky 397 478 10ms 3 Aug 2023 370th Bulmenisaurus 397 478 10ms 24 Jul 2024 370th Chara-0x 397 478 10ms 17 Sep 2025 378th deflatSOCO 397 479 10ms 21 Mar 2020 378th mattgrunwald 397 479 10ms 8 May 2020 378th michelebastione 🇮🇹 397 479 10ms 21 Jul 2020 378th ToonAlfrink 397 479 10ms 13 Nov 2020 378th geofft 397 479 10ms 12 Dec 2020 378th idoweinstein 397 479 10ms 3 Aug 2022 378th AbhilashaTandon 397 479 10ms 21 Sep 2023 378th 1231234md5 🇨🇳 397 479 10ms 14 Dec 2023 378th CutSandstone 397 479 10ms 5 Jul 2024 378th roguh 🇬🇹 397 479 10ms 24 Dec 2024 378th denisfouchard 397 479 9ms 23 Aug 2025 378th hanneshdc 397 479 10ms 10 Sep 2025 390th 6lr61 396 480 9ms 25 Dec 2022 390th wa1ker38552 396 480 10ms 20 May 2023 390th asterized 396 480 10ms 22 Jun 2024 393rd scottwday 🇨🇦 395 481 10ms 20 Nov 2021 393rd chayleaf 395 481 11ms 7 Jan 2022 393rd Alfiecxn 🇬🇧 395 481 10ms 7 May 2022 393rd dsh0 395 481 11ms 7 Jun 2022 393rd calumacutt 395 481 10ms 22 Dec 2022 393rd mdnestor 395 481 10ms 27 Dec 2022 393rd toripppppy 395 481 10ms 21 Apr 2024 393rd yokasuretsu 395 481 11ms 13 Jan 2025 First Prev 321–400 of 1,171 Next Last
