The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 28 hours. Why not try and solve them ahead of time?
12 Days of Christmas 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 150th logvp 408 466 10ms 12 Jan 2024 150th PotatoSaladOverlord 408 466 9ms 19 Jan 2024 150th smilesformiles3 408 466 10ms 11 Jun 2025 150th Aphadion 408 466 10ms 19 Feb 2026 165th TheAristos 407 467 11ms 25 Oct 2019 165th reedwilemon 407 467 9ms 12 Jun 2020 165th georgehulme 407 467 10ms 26 Jan 2022 165th SniperSmiley 🇺🇸 407 467 11ms 5 Dec 2022 165th nstearns96 🇬🇧 407 467 9ms 13 Jan 2023 165th isorlab49 407 467 10ms 24 May 2023 165th yzhs 🇩🇪 407 467 9ms 23 Jun 2023 165th LocNgu 407 467 9ms 13 Jul 2023 165th CorporalCrawdad 407 467 10ms 5 Sep 2024 165th andrewjc2000 407 467 10ms 25 Feb 2025 165th qpwoeirut 407 467 10ms 2 Oct 2025 165th jet689 407 467 10ms 3 Jan 2026 177th xorraxrax 406 468 10ms 31 Oct 2019 177th Crambor 406 468 9ms 9 Jan 2020 177th vort3 406 468 10ms 1 May 2020 177th urojony 🇵🇱 406 468 10ms 4 Jan 2021 177th NanduBC 406 468 10ms 14 Mar 2021 177th osmith93 406 468 10ms 31 Jul 2021 177th face0xff 406 468 10ms 28 Dec 2021 177th joshmoody24 406 468 10ms 4 Mar 2022 177th pascscha 406 468 10ms 9 May 2022 177th MaxElf999 406 468 10ms 29 Sep 2022 177th fredrik-bakke 🇳🇴 406 468 30ms 5 Oct 2022 177th za3k 406 468 10ms 12 Oct 2022 177th Troon 406 468 9ms 25 Oct 2022 177th commandz0 🇺🇸 406 468 10ms 21 Nov 2022 177th mathb0y512 406 468 10ms 20 Jan 2023 177th eddvrs 406 468 10ms 22 Dec 2023 177th JorgiEagle 406 468 10ms 8 Feb 2024 177th SB-945 406 468 10ms 17 Apr 2024 177th EnTerr 406 468 10ms 8 Sep 2024 177th lhulinsky 406 468 10ms 31 Oct 2024 177th dokutan 406 468 9ms 20 Apr 2025 177th jtyliu 406 468 9ms 6 Aug 2025 199th sisyphus-ppcg 🇦🇺 405 469 10ms 11 Nov 2020 199th argusdusty 🇺🇸 405 469 9ms 25 Dec 2020 199th jacklynnepenick 405 469 10ms 10 Aug 2021 199th Thestralos 405 469 10ms 24 Feb 2023 199th quimey 405 469 10ms 23 Mar 2023 199th keegan-t 🇨🇦 405 469 10ms 20 Sep 2023 199th Entropite 405 469 10ms 20 Aug 2024 199th croc54 405 469 10ms 13 Dec 2024 199th Pyroan 405 469 9ms 22 Feb 2025 199th now4est 🇯🇵 405 469 10ms 24 Sep 2025 199th dvckyduck 🇧🇬 405 469 11ms 7 Feb 2026 210th zdzc 404 470 10ms 3 Feb 2018 210th celynw 404 470 9ms 26 Dec 2018 210th petroselo 404 470 10ms 11 Apr 2022 210th Just4FunCoder 404 470 10ms 26 Oct 2022 210th PATTRIM 404 470 9ms 4 Jan 2023 210th mbittner20 404 470 10ms 8 Feb 2023 210th 2011-Chan-Ethan 404 470 10ms 9 Jul 2023 210th GeneralPoxter 404 470 10ms 7 Dec 2023 210th cuboids 404 470 10ms 16 Jul 2024 210th thoraage 404 470 10ms 21 Oct 2024 210th starfihs 404 470 9ms 28 Dec 2024 210th To5BG 404 470 10ms 16 Nov 2025 210th iliaspapa 404 470 9ms 10 Dec 2025 210th tomh1012 404 470 10ms 26 days ago 224th PiterAnnema 403 471 10ms 30 Aug 2020 224th wirewolf010 403 471 10ms 3 Jan 2022 224th CedricGebistorf 403 471 10ms 25 Feb 2022 224th jmerle 🇳🇱 403 471 10ms 22 Jun 2023 224th JunkIce 403 471 10ms 24 Sep 2024 224th lukelarson 403 471 10ms 22 Apr 2025 224th smaass 403 471 10ms 12 Jul 2025 224th jacklee1792 403 471 11ms 6 Aug 2025 232nd Gymhgy 403 472 10ms 23 Apr 2019 232nd rak1507 🇬🇧 403 472 10ms 15 Oct 2020 232nd awnion 403 472 10ms 26 Dec 2020 232nd harrymwilkins 🇬🇧 403 472 10ms 19 Jul 2021 232nd OpesMentis 403 472 10ms 29 Oct 2021 232nd TimHuisman1703 403 472 10ms 7 Jan 2022 232nd Hakiwen 403 472 10ms 21 Jan 2022 232nd jm600 403 472 10ms 19 Apr 2022 232nd twocatsinatrenchcoat 403 472 9ms 4 May 2022 First Prev 161–240 of 1,171 Next Last
