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 797th AharonSambol 759 544 16ms 18 Aug 2023 797th AthiraPillai123 759 544 9ms 4 Jan 2024 797th multikatt 759 544 9ms 13 Jan 2026 797th davidludwik2370 759 544 10ms 20 days ago 805th dzshn 758 545 10ms 25 Nov 2020 805th jellybro99 758 545 9ms 15 Oct 2021 805th StoverGitHub 758 545 11ms 16 Jun 2022 805th Bananapants22 758 545 9ms 15 Aug 2022 805th bedwards 758 545 10ms 13 Jan 2025 810th llysnafedd 756 546 10ms 28 Aug 2020 810th alexstarosta 756 546 10ms 27 Jun 2024 810th kyleyarwood 756 546 9ms 4 Oct 2024 810th jwfiredragon 756 546 11ms 15 May 2025 814th smf0x10 755 547 10ms 3 Oct 2021 814th Eilonlif 🇮🇱 755 547 10ms 25 Dec 2022 814th b20fuji 755 547 10ms 18 Oct 2023 814th Amy-Checcllo 755 547 9ms 22 Sep 2024 814th GeorgeStatho 755 547 11ms 5 Aug 2025 819th DylanScottCarroll 754 548 10ms 8 Nov 2021 819th RubiksImplosion 754 548 10ms 4 Dec 2022 819th felixcroc 754 548 11ms 1 Apr 2023 819th epic-programmer-guy 754 548 10ms 29 Dec 2023 819th MassimoParisi 754 548 16ms 24 Sep 2024 819th Shotokhan 754 548 10ms 15 Sep 2025 819th Evytag 🇫🇷 754 548 10ms 9 Oct 2025 826th afyber 752 549 9ms 26 Jun 2019 826th my1e5 752 549 9ms 29 Nov 2021 826th oakesy 752 549 10ms 19 May 2024 826th CyberTapir 752 549 10ms 30 Aug 2024 826th martindotexe 🇳🇴 752 549 17ms 15 Feb 2025 826th shawncrabtree 752 549 10ms 21 Jun 2025 826th Sharrrkkk 752 549 10ms 21 Jul 2025 833rd Esterfox610 751 550 10ms 17 Aug 2022 833rd llama1024 751 550 10ms 5 Dec 2022 833rd lorienaquarius 751 550 10ms 31 Dec 2023 836th eoinfennessy 750 551 10ms 21 Jul 2021 836th micah-weitzman 750 551 10ms 27 Jul 2021 836th mehekj 750 551 10ms 29 Jul 2021 836th No-Jons 750 551 9ms 23 May 2022 840th Parapet128 748 552 9ms 17 Jan 2019 840th dillon-duncando 748 552 10ms 19 Dec 2021 840th nmougino 🇫🇷 748 552 17ms 31 May 2022 840th Vaibhav0460 748 552 10ms 16 Feb 2024 840th navier-1 748 552 10ms 15 Sep 2025 840th kasarino 748 552 10ms 30 Nov 2025 846th aazuspan 747 553 10ms 24 Nov 2021 846th leeyonjae 747 553 11ms 10 Dec 2023 846th jjkochan2 747 553 9ms 17 Jan 2025 849th carsonsyberg 745 554 11ms 9 May 2022 850th Alexander-Francis 744 555 10ms 10 Jul 2019 850th itiievskyi 🇺🇦 744 555 10ms 10 Aug 2020 850th KasperKivimaeki 🇫🇮 744 555 10ms 20 Nov 2025 850th pingpwn 744 555 10ms 14 Feb 2026 854th dddthedark 743 556 10ms 21 Jun 2019 854th ejerrard 743 556 10ms 27 Aug 2020 854th robertovers 743 556 14ms 29 Sep 2023 854th imnotAlexKnight 743 556 10ms 10 Jul 2025 854th rahulbyte-js 743 556 10ms 25 Nov 2025 859th amadeusdotpng 740 558 10ms 22 Apr 2023 859th iliao2345 740 558 10ms 8 Jul 2025 861st lmolteno 739 559 10ms 3 Mar 2021 861st jmath3912 739 559 10ms 26 Apr 2024 863rd estomagordo 🇳🇱 738 560 10ms 3 Aug 2019 863rd gautambp 738 560 18ms 22 Jun 2025 863rd iilegacyyii 738 560 17ms 30 Dec 2025 866th kalpanasuresh 736 561 10ms 26 Mar 2021 866th luxdragon 736 561 10ms 11 Oct 2022 866th falinos 736 561 10ms 1 Jan 2023 866th andyxukq 736 561 10ms 4 Feb 2025 870th zgialor-lab 735 562 10ms 18 days ago 871st fl3ur1nestimable 734 563 10ms 28 Mar 2022 872nd NuqieNoila 732 564 9ms 1 Feb 2019 872nd bwenstar 732 564 10ms 9 Aug 2022 872nd Saaxxx 732 564 10ms 22 Aug 2023 875th MiranDaniel 🇨🇿 731 565 17ms 30 Aug 2023 875th pquline 731 565 9ms 5 Mar 2025 877th artur-py 730 566 10ms 16 Dec 2022 877th skarabb 730 566 10ms 26 Mar 2024 879th CRHillman 727 568 10ms 14 Aug 2018 879th CheeseCake628 🇳🇴 727 568 31ms 19 Mar 2023 First Prev 801–880 of 1,168 Next Last
