The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 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 879th Greguhh 727 568 10ms 22 Oct 2024 882nd msrawson 726 569 9ms 13 Aug 2018 882nd TJK-S 726 569 10ms 25 Oct 2025 882nd mmarkakis 726 569 10ms 1 Dec 2025 882nd punoko 726 569 10ms 9 Dec 2025 886th ei14 725 570 10ms 18 Jun 2021 886th amollberg 🇸🇪 725 570 10ms 3 Jan 2022 886th Eulentier161 725 570 18ms 30 Aug 2023 889th te-chnical 723 571 10ms 23 Dec 2025 890th Watermelon876 722 572 10ms 27 Nov 2021 890th markbyrne 722 572 10ms 25 Aug 2022 890th joonaspu 722 572 10ms 3 Jun 2023 890th alfonsoalves 722 572 10ms 27 Feb 2024 894th BenAns 721 573 10ms 17 Nov 2018 894th KevinLaux 721 573 11ms 4 Dec 2022 896th Dejgz 718 575 10ms 11 Sep 2023 896th gigaprofisi 🇺🇸 718 575 11ms 2 Mar 2025 898th sayloren 717 576 10ms 30 Jul 2025 899th anananlyjlyj 716 577 10ms 2 Jul 2018 899th Sami-ul 716 577 11ms 12 Oct 2021 899th godCoderXYZ 716 577 10ms 5 Dec 2024 902nd omgardner 715 578 10ms 1 Mar 2019 902nd samual-hain 715 578 10ms 4 Apr 2024 902nd JMMMMC 715 578 12ms 23 Oct 2024 905th bakaq 713 579 10ms 4 Jan 2020 905th danielweper 713 579 11ms 21 Oct 2021 907th NoneTheFewer 711 581 10ms 27 Dec 2025 908th Matistjati 710 582 10ms 17 Feb 2020 909th jpyCode 708 583 10ms 14 Jan 2019 910th osNiko 🇧🇷 706 585 11ms 25 Dec 2025 911th selketdaly 704 587 10ms 21 Feb 2021 911th DePopadopalis 704 587 10ms 6 Apr 2022 911th julienlamoureux78 704 587 11ms 17 Aug 2022 914th benanlam 702 588 10ms 20 Dec 2025 915th dlevear 701 589 10ms 20 May 2021 915th PrinceSalatyell 701 589 9ms 22 Jun 2022 917th maxliuql 700 590 9ms 11 Jul 2025 918th joel-e-m-mitchell 699 591 10ms 10 Jun 2018 918th Nektar24 699 591 10ms 2 Jun 2023 918th Nightmarius 699 591 17ms 22 Jan 2024 921st bnuh 698 592 10ms 3 Dec 2022 921st omero-san 698 592 10ms 15 Sep 2025 923rd plainoldcheese 🇦🇶 695 594 10ms 16 Apr 2020 924th lewisdean98 694 595 30ms 4 Dec 2022 924th atrus159 694 595 10ms 24 Oct 2023 926th ktnguyen2 692 597 10ms 4 Jan 2020 926th halp1 692 597 10ms 7 Apr 2022 928th jjbvtk 691 598 10ms 31 Aug 2021 928th lethan3 691 598 9ms 1 Dec 2022 930th Modeba 689 599 10ms 5 Nov 2025 931st clodalala 688 600 10ms 1 Nov 2019 932nd dylanjones92 682 606 10ms 19 Jan 2024 933rd zuparnowa 680 607 9ms 28 Jan 2019 933rd henrytranter 680 607 10ms 20 Sep 2019 935th Piccora 679 608 10ms 3 Oct 2022 935th Baxi-codes 679 608 10ms 4 Jan 2023 937th FJSFerreira 678 609 10ms 22 May 2021 938th besasam 677 610 9ms 31 Mar 2021 938th OddAlgorithm 677 610 10ms 4 Dec 2022 940th surbainczyk 676 611 10ms 22 Jul 2022 941st lakshmanaprasanth 672 615 10ms 10 Jun 2021 942nd mhenion8293 🇺🇸 670 616 10ms 11 Jan 2022 942nd kelseychristensen 670 616 11ms 3 Nov 2022 942nd jrappeneker 670 616 10ms 24 Apr 2025 945th warrinerbros 668 618 10ms 3 Dec 2021 946th valgardg 🇮🇸 666 620 16ms 17 Aug 2021 947th delphonso 665 621 10ms 17 Dec 2021 947th Knight333 665 621 9ms 26 Dec 2023 949th MadasMatt4 663 623 10ms 29 Jan 2020 949th anarcie 663 623 10ms 12 Dec 2023 951st kbiggers 662 624 10ms 8 Dec 2020 952nd etriddle88 657 629 10ms 7 Mar 2024 953rd jackdonofrio 656 630 10ms 10 Apr 2020 954th foskaos 653 632 10ms 30 Oct 2023 954th Matthewhine8 653 632 10ms 25 Aug 2025 956th RobinStevenMartinez 652 633 10ms 8 Feb 2021 956th Rex-xeR 652 633 11ms 4 Jan 2025 958th Eugen-str 649 636 11ms 24 Oct 2023 959th zt14427 646 639 9ms 4 Mar 2023 960th mper-era 644 641 10ms 3 Feb 2026 First Prev 881–960 of 1,168 Next Last
