The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 days. 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 1st hellopir2 1,000 190 2,167ms 14 hours ago 2nd JayXon 🇺🇸 460 413 27ms 3 Jan 2026 3rd sunleonid 459 414 10ms 2 Jan 2026 3rd Lydxn 🇨🇦 459 414 31ms 3 Jan 2026 5th FoxInTheClouds 455 418 11ms 21 days ago 6th xnor-gate 452 420 10ms 28 Apr 2021 6th duckyluuk 🇳🇱 452 420 29ms 3 Jul 2025 8th hallvabo 🇳🇴 451 421 10ms 3 Jun 2021 9th pardouin 🇫🇷 450 422 11ms 23 Mar 2024 10th Steffan153 🇫🇮 449 423 32ms 2 Sep 2024 11th btnlq 448 424 9ms 11 Oct 2020 11th primo-ppcg 🇹🇭 448 424 10ms 21 Dec 2020 11th StefanHabel 🇨🇦 448 424 10ms 26 Dec 2021 11th ovs-code 🇩🇪 448 424 10ms 22 Sep 2024 11th sean-niemann 🇺🇸 448 424 30ms 11 Nov 2025 11th ryyyn 🇺🇸 448 424 10ms 3 Dec 2025 17th kacogg5 446 426 31ms 9 Jul 2022 18th bizy-coder 445 427 10ms 10 Sep 2024 19th shelerr 442 430 10ms 2 Jul 2022 19th davecame 442 430 10ms 30 Dec 2025 21st Mukundan314 441 431 10ms 29 Jun 2025 22nd lifthrasiir 🇰🇷 440 432 30ms 21 Nov 2024 23rd 5cw 🇺🇸 438 434 15ms 5 May 2024 24th BlankSpruce 437 435 11ms 3 Jan 2022 25th 051 🇸🇬 436 436 10ms 15 Dec 2025 26th andersk 🇺🇸 434 438 10ms 25 Oct 2022 27th Seek64 🇩🇪 433 439 10ms 23 Nov 2025 28th Attero 🇸🇪 432 440 32ms 22 Oct 2020 29th ageneric 431 441 10ms 17 Jan 2022 29th jared-hughes 431 441 10ms 25 Mar 2022 31st anter69 🇭🇺 430 442 10ms 20 Nov 2023 31st MeWhenI 🇻🇦 430 442 32ms 13 May 2025 31st Openstreetmapler 430 442 9ms 9 Jan 2026 34th annaproxy 427 445 10ms 28 Mar 2022 35th bzijlema 🇳🇱 426 446 10ms 14 Oct 2024 36th bricknellj 425 447 10ms 22 Jul 2022 36th betaveros 425 447 10ms 29 Dec 2022 38th prplz 🇦🇺 424 448 11ms 5 Oct 2020 38th TFeld00 🇩🇰 424 448 29ms 19 Jan 2021 38th GrayJoKing 🇦🇺 424 448 11ms 4 Nov 2021 38th m-tkach 🇺🇦 424 448 10ms 19 Dec 2021 38th janbehrens 🇩🇪 424 448 10ms 17 Jun 2023 43rd mathisfun271 423 449 10ms 25 Dec 2023 43rd BenCarey88 423 449 11ms 3 Jan 2025 43rd ZorblaxV 423 449 11ms 4 Jan 2025 43rd maxgodfrey2004 🇨🇦 423 449 10ms 14 Feb 2025 43rd Lv0Sys 🇵🇱 423 449 10ms 25 Dec 2025 48th gnash117 422 450 10ms 29 Dec 2020 48th jonmsawyer 422 450 9ms 30 Dec 2020 48th scpchicken 🇵🇼 422 450 10ms 4 Feb 2023 48th snoozingnewt 🇨🇦 422 450 10ms 23 Nov 2025 48th Flekay 🇩🇪 422 450 10ms 25 Feb 2026 53rd PurkkaKoodari 🇫🇮 421 451 32ms 23 Nov 2024 54th DynamiteBear 420 452 10ms 24 Nov 2022 54th minhtrancccp 420 452 10ms 2 Oct 2023 54th blaztoma 🇱🇹 420 452 10ms 22 Sep 2025 54th ahmetdemirag 🇨🇾 420 452 11ms 3 Oct 2025 58th kg583 🇺🇸 419 453 10ms 17 Nov 2022 58th albanian-laundromat 419 453 10ms 11 Nov 2025 58th sudhackar 419 453 10ms 26 Feb 2026 61st orthoplex 🇨🇽 419 454 10ms 14 Jan 2022 61st paralysedforce 419 454 9ms 7 Aug 2023 61st aditya-u 419 454 9ms 6 Jul 2024 61st Emutis 🇱🇹 419 454 10ms 26 Dec 2024 61st Kyogre-Primal 🇺🇦 419 454 10ms 16 May 2025 61st zhaohm14 419 454 10ms 16 May 2025 67th myfatemi04 418 455 10ms 1 Mar 2018 67th neihousaigaai 418 455 10ms 26 Dec 2021 67th AlephSquirrel 418 455 9ms 7 Jan 2023 67th SubsTheTechnomancer 418 455 11ms 28 Feb 2023 67th chartung17 418 455 11ms 31 Dec 2023 67th neel11235813 418 455 10ms 26 Mar 2024 67th FranklinJiaChen 418 455 9ms 12 Jun 2024 67th souta-1326 418 455 11ms 27 Mar 2025 67th Baroniket 418 455 10ms 13 Aug 2025 76th NewDefectus 🇮🇱 417 456 9ms 8 Nov 2020 76th yanjs 417 456 9ms 1 Oct 2021 76th Irratix 🇳🇱 417 456 9ms 29 Apr 2022 76th stefangimmillaro 417 456 11ms 18 Nov 2022 76th GolfingSuccess 🇬🇷 417 456 10ms 25 Dec 2023 1–80 of 1,169 Next Last
