The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 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 479th deerfarce 828 499 10ms 23 Dec 2022 479th bob-th 828 499 10ms 29 Dec 2022 479th DonCharlesLambert 828 499 11ms 15 Feb 2024 479th hiichbindermax 828 499 9ms 3 Sep 2024 479th jasonxue1 828 499 10ms 26 Jul 2025 479th yukii1004 828 499 10ms 25 Sep 2025 479th yujqiao 828 499 9ms 16 Dec 2025 488th Psirving 826 500 10ms 20 Jul 2020 488th stephenuniverse 826 500 10ms 23 Aug 2021 488th Giridesh 826 500 10ms 3 Apr 2022 488th kimbo 🇺🇸 826 500 9ms 4 Dec 2022 488th Bmrl7 826 500 9ms 19 Mar 2024 488th planeklm 826 500 10ms 17 Dec 2024 488th raymur 826 500 10ms 26 Jun 2025 488th oween12 826 500 11ms 6 Aug 2025 488th estrawitch 826 500 10ms 11 days ago 497th adoxography 824 501 9ms 30 Mar 2018 497th sambirnbaum1 824 501 11ms 7 Sep 2019 497th ArturLukianov 824 501 10ms 27 Dec 2020 497th suhasdara 824 501 11ms 11 Sep 2022 497th ceeb9 824 501 10ms 5 May 2023 497th DrPrettyman 824 501 10ms 31 May 2023 497th lucaswiman 824 501 10ms 13 Aug 2023 497th damoose717 824 501 10ms 23 May 2025 497th bknower 824 501 10ms 25 Jun 2025 506th djtuBIG-MaliceX 823 502 16ms 30 Jan 2018 506th The3gs 823 502 10ms 13 Oct 2020 506th 77Tigers 823 502 10ms 28 Feb 2021 506th b4dpxl 823 502 9ms 10 Nov 2021 506th BrenSchaap 823 502 10ms 11 Nov 2021 506th firegene 🇮🇪 823 502 10ms 16 Dec 2021 506th thiccaxe 823 502 10ms 2 Oct 2022 506th EyalLitvin 823 502 10ms 16 Nov 2022 506th mikehanus 823 502 9ms 21 Nov 2023 515th kypi 821 503 10ms 20 Feb 2020 515th bastienvoirin 🇫🇷 821 503 11ms 28 Nov 2020 515th bbakersmith 821 503 10ms 26 Jul 2021 515th HassanAliKadhem 🇧🇭 821 503 30ms 5 Jan 2022 515th Expurple 821 503 10ms 8 Jan 2022 515th johnellis1392 821 503 10ms 5 Jan 2024 515th ImpressedByRocks 821 503 9ms 13 Mar 2024 515th Benzamp 821 503 10ms 26 days ago 523rd ArturLange 819 504 10ms 31 Aug 2018 523rd NoliHyd 819 504 9ms 11 Oct 2018 523rd badboj40 819 504 9ms 18 Jan 2023 523rd unknown25001 819 504 10ms 18 Jul 2024 523rd PyryL 🇫🇮 819 504 9ms 12 Aug 2024 523rd Marsolo1 819 504 10ms 24 Sep 2024 529th Smoncko 818 505 13ms 1 Feb 2023 529th jrbud 818 505 10ms 30 Dec 2023 529th xiaoyiming123 818 505 10ms 11 Aug 2025 529th OSYCh314 🇦🇺 818 505 10ms 12 Feb 2026 529th wdarling-cohere 818 505 10ms 19 days ago 534th mizuzimu 816 506 9ms 4 Feb 2020 534th mokymok 🇺🇸 816 506 10ms 1 Dec 2021 534th AlexanderFair 816 506 10ms 18 Jul 2023 534th yuchuehw 816 506 9ms 4 Jan 2024 534th cykim8811 816 506 10ms 11 Jul 2024 534th 40fied4t 816 506 10ms 15 May 2025 534th Rogacz 816 506 10ms 9 Jun 2025 534th MyckollWinchester 816 506 9ms 10 Dec 2025 542nd JBcoding 815 507 16ms 7 Sep 2020 542nd Thinthiner 815 507 17ms 7 Sep 2020 542nd bsoyka 🇺🇸 815 507 11ms 30 Dec 2022 542nd ozzypossie 815 507 11ms 26 May 2023 542nd qwertzuioppel 815 507 10ms 4 Mar 2024 542nd gyanesh-maurya 815 507 9ms 28 Dec 2025 548th TrAyZeN 813 508 10ms 18 Aug 2019 548th befoster 813 508 9ms 10 Apr 2021 548th pranavcode 813 508 31ms 26 Apr 2021 548th Cloakless 🇬🇧 813 508 16ms 18 Oct 2021 548th frankgraziano 813 508 10ms 14 Feb 2023 548th tejapvk 813 508 10ms 18 Jun 2025 548th wboka 813 508 10ms 25 Dec 2025 555th byteJager 811 509 11ms 3 Jan 2021 555th walterfeyman 811 509 10ms 30 Oct 2021 555th rollershutter 811 509 11ms 30 Nov 2021 555th gamer0kayf1n3 811 509 9ms 3 Jun 2022 555th RoscoeSmith 811 509 10ms 8 Sep 2022 555th lamorach 811 509 9ms 26 Mar 2024 First Prev 481–560 of 1,167 Next Last
