The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 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 314th msbranicky 864 478 10ms 3 Aug 2023 314th Bulmenisaurus 864 478 10ms 24 Jul 2024 314th Chara-0x 864 478 10ms 17 Sep 2025 324th deflatSOCO 862 479 9ms 21 Mar 2020 324th mattgrunwald 862 479 10ms 8 May 2020 324th michelebastione 🇮🇹 862 479 10ms 21 Jul 2020 324th ToonAlfrink 862 479 10ms 13 Nov 2020 324th geofft 862 479 10ms 12 Dec 2020 324th idoweinstein 862 479 10ms 3 Aug 2022 324th AbhilashaTandon 862 479 10ms 21 Sep 2023 324th 1231234md5 🇨🇳 862 479 10ms 14 Dec 2023 324th CutSandstone 862 479 10ms 5 Jul 2024 324th roguh 🇬🇹 862 479 10ms 24 Dec 2024 324th denisfouchard 862 479 9ms 23 Aug 2025 324th hanneshdc 862 479 10ms 10 Sep 2025 336th FlorianCassayre 🇫🇷 860 480 11ms 9 Nov 2022 336th 6lr61 860 480 9ms 25 Dec 2022 336th wa1ker38552 860 480 10ms 20 May 2023 336th asterized 860 480 10ms 22 Jun 2024 340th scottwday 🇨🇦 859 481 10ms 20 Nov 2021 340th chayleaf 859 481 10ms 7 Jan 2022 340th Alfiecxn 🇬🇧 859 481 10ms 7 May 2022 340th dsh0 859 481 10ms 7 Jun 2022 340th calumacutt 859 481 9ms 22 Dec 2022 340th mdnestor 859 481 10ms 27 Dec 2022 340th toripppppy 859 481 10ms 21 Apr 2024 340th yokasuretsu 859 481 10ms 13 Jan 2025 340th TiagoCosta04 🇵🇹 859 481 10ms 1 Jun 2025 340th JOrE20 859 481 9ms 24 Feb 2026 340th ASampsonMu31 859 481 10ms 20 days ago 351st Froststorm 857 482 10ms 8 Oct 2020 351st jaredtrh 857 482 11ms 12 Sep 2021 351st GWStuart 857 482 10ms 26 Nov 2021 351st lostMia 857 482 10ms 11 Jun 2023 351st raspofabs 857 482 10ms 8 Jul 2023 351st Mathrew2012 857 482 10ms 16 Aug 2024 351st RedzGoose 🇦🇺 857 482 10ms 13 Oct 2024 351st amberzit 857 482 10ms 3 Jul 2025 351st robin-scragg 857 482 10ms 20 Sep 2025 351st luuumine 🇫🇷 857 482 10ms 9 Nov 2025 361st hymanimy 855 483 9ms 24 Aug 2021 361st jrm5399 🇰🇿 855 483 10ms 31 Jan 2022 361st S-Ruban 855 483 11ms 26 Feb 2023 361st leonw774 855 483 10ms 24 Oct 2023 361st thomas-saigre 855 483 9ms 24 Jan 2024 361st OCNeve 855 483 9ms 17 Jun 2024 361st madex 🇩🇪 855 483 10ms 19 Dec 2024 361st AidanWalter 855 483 10ms 31 Dec 2024 361st jamiloBBKing 855 483 10ms 14 Apr 2025 361st Trildcookie 855 483 10ms 23 Dec 2025 361st jumpingtj 855 483 10ms 7 days ago 372nd GoodClover 🇬🇧 853 484 10ms 11 Nov 2020 372nd PatrickStephansen 🇿🇦 853 484 10ms 10 Dec 2021 372nd Fanrco 853 484 10ms 31 Aug 2023 372nd BREMAUCY 🇫🇷 853 484 10ms 6 May 2024 372nd inverseLorentz 🇦🇺 853 484 9ms 21 May 2024 372nd matsagad 853 484 11ms 12 Dec 2024 372nd syyynth 853 484 10ms 20 Oct 2025 379th bkshrader 852 485 9ms 11 Jan 2019 379th Andrey135296 852 485 9ms 2 Jan 2022 379th Yewzir 🇧🇪 852 485 9ms 7 Oct 2023 379th ballaire 852 485 9ms 21 Jan 2024 383rd abailey2020 🇺🇸 850 486 10ms 26 Dec 2020 383rd berkott 850 486 9ms 27 Dec 2022 383rd en4rab 850 486 10ms 6 May 2023 383rd markusgraube 850 486 10ms 8 Mar 2024 383rd CodeByAidan 🇺🇸 850 486 10ms 19 Jun 2024 383rd gthayden23 850 486 10ms 2 Oct 2024 383rd wh3n3v3r 🇨🇿 850 486 10ms 7 Nov 2024 383rd jacekwladzinski 850 486 10ms 8 Oct 2025 383rd deancureton 850 486 10ms 17 Dec 2025 392nd 71c 848 487 10ms 8 Mar 2018 392nd alangodfrey 848 487 10ms 6 Mar 2019 392nd Wildst 848 487 9ms 14 Jun 2022 392nd trist224 🇫🇷 848 487 10ms 5 Sep 2022 392nd Ripick 848 487 10ms 30 Dec 2022 392nd jmatko 848 487 10ms 17 Oct 2023 392nd abcdhhhh 848 487 10ms 24 Aug 2024 392nd morphthesworph 848 487 10ms 31 Dec 2025 400th timkaiser 846 488 10ms 18 Apr 2019 First Prev 321–400 of 1,171 Next Last
