The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 8 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 635th Florian-Mt 794 520 9ms 4 Dec 2025 642nd mothcolada 🇺🇸 793 521 11ms 11 Mar 2021 642nd nikhil9302 793 521 10ms 21 Nov 2021 642nd LeeCamp 793 521 10ms 11 Dec 2021 642nd jhpaques 🇫🇷 793 521 10ms 28 Dec 2022 642nd WillConker 793 521 11ms 14 Jul 2023 642nd 0xkarambit 793 521 10ms 27 days ago 648th HemangRajvanshy 791 522 10ms 1 Apr 2020 648th nmgetahun 791 522 10ms 5 Dec 2022 648th pde-bakk 🇳🇱 791 522 10ms 21 Oct 2023 648th raflemakt 791 522 10ms 3 Jan 2024 648th codingisgreatbutiamnot 791 522 10ms 29 Jul 2024 648th Kowalskiexe 🇵🇱 791 522 10ms 19 Apr 2025 654th nickrodgers42 790 523 10ms 2 Oct 2020 654th piebot3000 790 523 10ms 13 Sep 2023 654th IdkWhatIsIdk 790 523 10ms 28 Oct 2024 654th OyuDays 790 523 10ms 17 Mar 2025 654th AdamMorris377 790 523 10ms 1 Jan 2026 654th jusaka 790 523 10ms 4 days ago 660th gardarjuto 788 524 10ms 16 Nov 2020 660th xy3 🇮🇪 788 524 10ms 4 Jan 2022 660th xenufo 788 524 10ms 14 Jul 2022 660th james-downey 788 524 10ms 14 Jul 2022 660th Argon1999 788 524 10ms 21 Oct 2022 665th NicoAdams 787 525 10ms 21 Nov 2021 665th sleepyStick 787 525 11ms 5 Apr 2022 665th ce-warren 787 525 10ms 26 Aug 2023 665th funnsam 🇭🇰 787 525 9ms 23 Oct 2023 665th qwjhvbxi 787 525 11ms 5 Feb 2024 665th TheAtrossian 787 525 10ms 5 Jan 2025 665th HagenFritz 787 525 10ms 19 Jun 2025 665th jumpingtj 787 525 10ms 4 hours ago 673rd babulibaba 785 526 10ms 15 Aug 2019 673rd ashwinvis 785 526 9ms 17 Apr 2020 673rd hdformat 785 526 10ms 8 Jun 2020 673rd mathwiz42 785 526 10ms 17 Aug 2020 673rd confy 785 526 12ms 25 Oct 2020 673rd dgambit 785 526 10ms 2 Apr 2021 673rd goldstraw 785 526 10ms 30 Nov 2021 673rd JohannaWarnqvist 785 526 10ms 13 Feb 2022 673rd martinnorling 🇸🇪 785 526 10ms 28 Feb 2022 673rd ezhereshchin 785 526 11ms 1 May 2022 673rd NerdyMcNerd42 785 526 9ms 14 Oct 2022 673rd fredoinsilico 785 526 9ms 7 Sep 2023 673rd aviyanp 785 526 10ms 13 Oct 2025 673rd ethanlchristensen 785 526 10ms 17 Oct 2025 673rd ElieDeBrauwer 785 526 10ms 25 Oct 2025 688th asadullayev 784 527 10ms 8 Jan 2021 688th PYRiTEmonark 784 527 10ms 11 Mar 2021 688th BackslashWelsh 784 527 9ms 23 Jul 2021 688th TyKeeling 784 527 9ms 22 Jun 2022 688th cingulataluke 784 527 10ms 26 Aug 2023 688th SomeSomeOne99 784 527 10ms 26 Mar 2025 688th asarvazyan 784 527 10ms 22 Oct 2025 695th willzywiec 782 528 31ms 8 Aug 2018 695th ionutm82 782 528 10ms 9 Nov 2018 695th jhunterkohler 782 528 10ms 20 May 2021 695th elephantpanda 782 528 10ms 14 Oct 2022 695th sandorstormen 782 528 10ms 11 Mar 2023 695th fbe 782 528 10ms 11 Sep 2024 695th MasterGodzilla 782 528 16ms 26 Jun 2025 695th themoonisacheese 782 528 9ms 29 Dec 2025 695th Languag3 782 528 10ms 26 Jan 2026 704th RatajVaver 781 529 10ms 13 May 2019 704th henryishuman 781 529 10ms 23 May 2020 704th phpboyscout 781 529 10ms 5 Jan 2021 704th HorseScary 781 529 10ms 16 Nov 2021 704th lokesh1809 781 529 10ms 3 Dec 2021 709th scottJsonar 779 530 10ms 29 Nov 2019 709th WillowBee7 779 530 10ms 16 Sep 2020 709th jjgry 779 530 10ms 5 Nov 2020 709th GulgDev 779 530 10ms 21 Mar 2023 709th joshua-el-samalouti 🇩🇪 779 530 10ms 26 May 2024 709th jameswmccarty 779 530 10ms 11 Jul 2024 709th SOONwasTaken 779 530 9ms 18 Mar 2025 709th brandongumby 779 530 10ms 8 Jun 2025 709th abhinavuppala 779 530 10ms 12 days ago 718th bwat2 778 531 9ms 27 Dec 2021 718th zyc-2024 🇨🇳 778 531 11ms 30 Dec 2025 718th BenMaydan 778 531 10ms 16 days ago First Prev 641–720 of 1,167 Next Last
