The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 32 hours. 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 470th muratovm 382 498 10ms 10 Dec 2025 482nd orifu 381 499 9ms 22 Feb 2021 482nd Bombergames 381 499 10ms 21 Jan 2022 482nd deerfarce 381 499 10ms 23 Dec 2022 482nd bob-th 381 499 10ms 29 Dec 2022 482nd DonCharlesLambert 381 499 11ms 15 Feb 2024 482nd hiichbindermax 381 499 9ms 3 Sep 2024 482nd jasonxue1 381 499 10ms 26 Jul 2025 482nd yukii1004 381 499 10ms 25 Sep 2025 482nd yujqiao 381 499 9ms 16 Dec 2025 491st Psirving 380 500 10ms 20 Jul 2020 491st stephenuniverse 380 500 10ms 23 Aug 2021 491st Giridesh 380 500 10ms 3 Apr 2022 491st kimbo 🇺🇸 380 500 9ms 4 Dec 2022 491st Bmrl7 380 500 9ms 19 Mar 2024 491st planeklm 380 500 10ms 17 Dec 2024 491st raymur 380 500 10ms 26 Jun 2025 491st oween12 380 500 11ms 6 Aug 2025 491st estrawitch 380 500 10ms 16 days ago 500th adoxography 379 501 9ms 30 Mar 2018 500th sambirnbaum1 379 501 11ms 7 Sep 2019 500th ArturLukianov 379 501 10ms 27 Dec 2020 500th suhasdara 379 501 11ms 11 Sep 2022 500th ceeb9 379 501 10ms 5 May 2023 500th DrPrettyman 379 501 10ms 31 May 2023 500th lucaswiman 379 501 10ms 13 Aug 2023 500th damoose717 379 501 10ms 23 May 2025 500th bknower 379 501 10ms 25 Jun 2025 509th djtuBIG-MaliceX 378 502 16ms 30 Jan 2018 509th The3gs 378 502 10ms 13 Oct 2020 509th 77Tigers 378 502 10ms 28 Feb 2021 509th b4dpxl 378 502 9ms 10 Nov 2021 509th BrenSchaap 378 502 10ms 11 Nov 2021 509th firegene 🇮🇪 378 502 10ms 16 Dec 2021 509th thiccaxe 378 502 10ms 2 Oct 2022 509th EyalLitvin 378 502 10ms 16 Nov 2022 509th mikehanus 378 502 9ms 21 Nov 2023 518th kypi 378 503 10ms 20 Feb 2020 518th bastienvoirin 🇫🇷 378 503 11ms 28 Nov 2020 518th bbakersmith 378 503 10ms 26 Jul 2021 518th HassanAliKadhem 🇧🇭 378 503 30ms 5 Jan 2022 518th Expurple 378 503 10ms 8 Jan 2022 518th johnellis1392 378 503 10ms 5 Jan 2024 518th ImpressedByRocks 378 503 9ms 13 Mar 2024 518th Benzamp 378 503 10ms 26 Feb 2026 526th ArturLange 377 504 10ms 31 Aug 2018 526th NoliHyd 377 504 9ms 11 Oct 2018 526th badboj40 377 504 9ms 18 Jan 2023 526th unknown25001 377 504 10ms 18 Jul 2024 526th PyryL 🇫🇮 377 504 9ms 12 Aug 2024 526th Marsolo1 377 504 10ms 24 Sep 2024 532nd Smoncko 376 505 13ms 1 Feb 2023 532nd jrbud 376 505 10ms 30 Dec 2023 532nd xiaoyiming123 376 505 10ms 11 Aug 2025 532nd OSYCh314 🇦🇺 376 505 10ms 12 Feb 2026 532nd wdarling-cohere 376 505 10ms 25 days ago 537th mizuzimu 375 506 9ms 4 Feb 2020 537th mokymok 🇺🇸 375 506 10ms 1 Dec 2021 537th AlexanderFair 375 506 10ms 18 Jul 2023 537th yuchuehw 375 506 9ms 4 Jan 2024 537th cykim8811 375 506 10ms 11 Jul 2024 537th 40fied4t 375 506 10ms 15 May 2025 537th Rogacz 375 506 10ms 9 Jun 2025 537th MyckollWinchester 375 506 9ms 10 Dec 2025 545th JBcoding 375 507 16ms 7 Sep 2020 545th Thinthiner 375 507 17ms 7 Sep 2020 545th bsoyka 🇺🇸 375 507 11ms 30 Dec 2022 545th ozzypossie 375 507 11ms 26 May 2023 545th qwertzuioppel 375 507 10ms 4 Mar 2024 545th gyanesh-maurya 375 507 9ms 28 Dec 2025 551st TrAyZeN 374 508 10ms 18 Aug 2019 551st befoster 374 508 9ms 10 Apr 2021 551st pranavcode 374 508 31ms 26 Apr 2021 551st Cloakless 🇬🇧 374 508 16ms 18 Oct 2021 551st frankgraziano 374 508 10ms 14 Feb 2023 551st tejapvk 374 508 10ms 18 Jun 2025 551st wboka 374 508 10ms 25 Dec 2025 558th byteJager 373 509 11ms 3 Jan 2021 558th walterfeyman 373 509 10ms 30 Oct 2021 558th rollershutter 373 509 11ms 30 Nov 2021 First Prev 481–560 of 1,171 Next Last
