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 637th joao-parreira 365 520 31ms 24 Apr 2024 637th kejcao 🇨🇦 365 520 16ms 10 May 2024 637th Florian-Mt 365 520 9ms 4 Dec 2025 644th mothcolada 🇺🇸 365 521 11ms 11 Mar 2021 644th nikhil9302 365 521 10ms 21 Nov 2021 644th LeeCamp 365 521 10ms 11 Dec 2021 644th jhpaques 🇫🇷 365 521 10ms 28 Dec 2022 644th WillConker 365 521 11ms 14 Jul 2023 644th 0xkarambit 365 521 10ms 24 Feb 2026 650th HemangRajvanshy 364 522 10ms 1 Apr 2020 650th nmgetahun 364 522 10ms 5 Dec 2022 650th pde-bakk 🇳🇱 364 522 10ms 21 Oct 2023 650th raflemakt 364 522 10ms 3 Jan 2024 650th codingisgreatbutiamnot 364 522 10ms 29 Jul 2024 650th Kowalskiexe 🇵🇱 364 522 10ms 19 Apr 2025 656th nickrodgers42 363 523 10ms 2 Oct 2020 656th piebot3000 363 523 10ms 13 Sep 2023 656th IdkWhatIsIdk 363 523 10ms 28 Oct 2024 656th OyuDays 363 523 10ms 17 Mar 2025 656th AdamMorris377 363 523 10ms 1 Jan 2026 656th jusaka 363 523 10ms 10 days ago 662nd gardarjuto 363 524 10ms 16 Nov 2020 662nd xy3 🇮🇪 363 524 10ms 4 Jan 2022 662nd xenufo 363 524 10ms 14 Jul 2022 662nd james-downey 363 524 10ms 14 Jul 2022 662nd Argon1999 363 524 10ms 21 Oct 2022 667th NicoAdams 362 525 10ms 21 Nov 2021 667th sleepyStick 362 525 11ms 5 Apr 2022 667th ce-warren 362 525 10ms 26 Aug 2023 667th funnsam 🇭🇰 362 525 9ms 23 Oct 2023 667th qwjhvbxi 362 525 11ms 5 Feb 2024 667th TheAtrossian 362 525 10ms 5 Jan 2025 667th HagenFritz 362 525 10ms 19 Jun 2025 674th babakoban 361 526 10ms 15 Aug 2019 674th ashwinvis 361 526 9ms 17 Apr 2020 674th hdformat 361 526 10ms 8 Jun 2020 674th mathwiz42 361 526 10ms 17 Aug 2020 674th confy 361 526 12ms 25 Oct 2020 674th dgambit 361 526 10ms 2 Apr 2021 674th goldstraw 361 526 10ms 30 Nov 2021 674th JohannaWarnqvist 361 526 10ms 13 Feb 2022 674th martinnorling 🇸🇪 361 526 10ms 28 Feb 2022 674th ezhereshchin 361 526 11ms 1 May 2022 674th NerdyMcNerd42 361 526 9ms 14 Oct 2022 674th fredoinsilico 361 526 9ms 7 Sep 2023 674th aviyanp 361 526 10ms 13 Oct 2025 674th ethanlchristensen 361 526 10ms 17 Oct 2025 674th ElieDeBrauwer 361 526 10ms 25 Oct 2025 689th asadullayev 361 527 10ms 8 Jan 2021 689th PYRiTEmonark 361 527 10ms 11 Mar 2021 689th BackslashWelsh 361 527 9ms 23 Jul 2021 689th TyKeeling 361 527 9ms 22 Jun 2022 689th cingulataluke 361 527 10ms 26 Aug 2023 689th SomeSomeOne99 361 527 10ms 26 Mar 2025 689th asarvazyan 361 527 10ms 22 Oct 2025 696th willzywiec 360 528 31ms 8 Aug 2018 696th ionutm82 360 528 10ms 9 Nov 2018 696th jhunterkohler 360 528 10ms 20 May 2021 696th elephantpanda 360 528 10ms 14 Oct 2022 696th sandorstormen 360 528 10ms 11 Mar 2023 696th fbe 360 528 10ms 11 Sep 2024 696th MasterGodzilla 360 528 16ms 26 Jun 2025 696th themoonisacheese 360 528 9ms 29 Dec 2025 696th Languag3 360 528 10ms 26 Jan 2026 705th RatajVaver 359 529 10ms 13 May 2019 705th henryishuman 359 529 10ms 23 May 2020 705th phpboyscout 359 529 10ms 5 Jan 2021 705th HorseScary 359 529 10ms 16 Nov 2021 705th lokesh1809 359 529 10ms 3 Dec 2021 710th scottJsonar 358 530 10ms 29 Nov 2019 710th WillowBee7 358 530 10ms 16 Sep 2020 710th jjgry 358 530 10ms 5 Nov 2020 710th GulgDev 358 530 10ms 21 Mar 2023 710th joshua-el-samalouti 🇩🇪 358 530 10ms 26 May 2024 710th jameswmccarty 358 530 10ms 11 Jul 2024 710th SOONwasTaken 358 530 9ms 18 Mar 2025 710th brandongumby 358 530 10ms 8 Jun 2025 710th abhinavuppala 358 530 10ms 18 days ago 719th bwat2 358 531 9ms 27 Dec 2021 719th zyc-2024 🇨🇳 358 531 11ms 30 Dec 2025 First Prev 641–720 of 1,169 Next Last
