The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 40 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 397 478 10ms 3 Aug 2023 314th Bulmenisaurus 397 478 10ms 24 Jul 2024 314th Chara-0x 397 478 10ms 17 Sep 2025 324th deflatSOCO 397 479 10ms 21 Mar 2020 324th mattgrunwald 397 479 10ms 8 May 2020 324th michelebastione 🇮🇹 397 479 10ms 21 Jul 2020 324th ToonAlfrink 397 479 10ms 13 Nov 2020 324th geofft 397 479 10ms 12 Dec 2020 324th idoweinstein 397 479 10ms 3 Aug 2022 324th AbhilashaTandon 397 479 10ms 21 Sep 2023 324th 1231234md5 🇨🇳 397 479 10ms 14 Dec 2023 324th CutSandstone 397 479 10ms 5 Jul 2024 324th roguh 🇬🇹 397 479 10ms 24 Dec 2024 324th denisfouchard 397 479 9ms 23 Aug 2025 324th hanneshdc 397 479 10ms 10 Sep 2025 336th FlorianCassayre 🇫🇷 396 480 11ms 9 Nov 2022 336th 6lr61 396 480 9ms 25 Dec 2022 336th wa1ker38552 396 480 10ms 20 May 2023 336th asterized 396 480 10ms 22 Jun 2024 340th scottwday 🇨🇦 395 481 10ms 20 Nov 2021 340th chayleaf 395 481 11ms 7 Jan 2022 340th Alfiecxn 🇬🇧 395 481 10ms 7 May 2022 340th dsh0 395 481 11ms 7 Jun 2022 340th calumacutt 395 481 10ms 22 Dec 2022 340th mdnestor 395 481 10ms 27 Dec 2022 340th toripppppy 395 481 10ms 21 Apr 2024 340th yokasuretsu 395 481 11ms 13 Jan 2025 340th TiagoCosta04 🇵🇹 395 481 10ms 1 Jun 2025 340th JOrE20 395 481 9ms 24 Feb 2026 340th ASampsonMu31 395 481 10ms 19 days ago 351st Froststorm 394 482 10ms 8 Oct 2020 351st jaredtrh 394 482 11ms 12 Sep 2021 351st GWStuart 394 482 10ms 26 Nov 2021 351st lostMia 394 482 10ms 11 Jun 2023 351st raspofabs 394 482 10ms 8 Jul 2023 351st Mathrew2012 394 482 10ms 16 Aug 2024 351st RedzGoose 🇦🇺 394 482 10ms 13 Oct 2024 351st amberzit 394 482 10ms 3 Jul 2025 351st robin-scragg 394 482 10ms 20 Sep 2025 351st luuumine 🇫🇷 394 482 10ms 9 Nov 2025 361st hymanimy 393 483 9ms 24 Aug 2021 361st jrm5399 🇰🇿 393 483 10ms 31 Jan 2022 361st S-Ruban 393 483 11ms 26 Feb 2023 361st leonw774 393 483 10ms 24 Oct 2023 361st thomas-saigre 393 483 9ms 24 Jan 2024 361st OCNeve 393 483 9ms 17 Jun 2024 361st madex 🇩🇪 393 483 10ms 19 Dec 2024 361st AidanWalter 393 483 10ms 31 Dec 2024 361st jamiloBBKing 393 483 10ms 14 Apr 2025 361st Trildcookie 393 483 10ms 23 Dec 2025 361st jumpingtj 393 483 10ms 6 days ago 372nd GoodClover 🇬🇧 393 484 10ms 11 Nov 2020 372nd PatrickStephansen 🇿🇦 393 484 10ms 10 Dec 2021 372nd Fanrco 393 484 10ms 31 Aug 2023 372nd BREMAUCY 🇫🇷 393 484 10ms 6 May 2024 372nd inverseLorentz 🇦🇺 393 484 9ms 21 May 2024 372nd matsagad 393 484 11ms 12 Dec 2024 372nd syyynth 393 484 10ms 20 Oct 2025 379th bkshrader 392 485 9ms 11 Jan 2019 379th Andrey135296 392 485 9ms 2 Jan 2022 379th Yewzir 🇧🇪 392 485 9ms 7 Oct 2023 379th ballaire 392 485 9ms 21 Jan 2024 383rd abailey2020 🇺🇸 391 486 10ms 26 Dec 2020 383rd berkott 391 486 9ms 27 Dec 2022 383rd en4rab 391 486 10ms 6 May 2023 383rd markusgraube 391 486 10ms 8 Mar 2024 383rd CodeByAidan 🇺🇸 391 486 10ms 19 Jun 2024 383rd gthayden23 391 486 10ms 2 Oct 2024 383rd wh3n3v3r 🇨🇿 391 486 10ms 7 Nov 2024 383rd jacekwladzinski 391 486 10ms 8 Oct 2025 383rd deancureton 391 486 10ms 17 Dec 2025 392nd 71c 390 487 10ms 8 Mar 2018 392nd alangodfrey 390 487 10ms 6 Mar 2019 392nd Wildst 390 487 9ms 14 Jun 2022 392nd trist224 🇫🇷 390 487 10ms 5 Sep 2022 392nd Ripick 390 487 10ms 30 Dec 2022 392nd jmatko 390 487 10ms 17 Oct 2023 392nd abcdhhhh 390 487 10ms 24 Aug 2024 392nd morphthesworph 390 487 10ms 31 Dec 2025 400th timkaiser 389 488 10ms 18 Apr 2019 First Prev 321–400 of 1,171 Next Last
