The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 days. Why not try and solve them ahead of time?
12 Days of Christmas in Python in chars. 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 Chars Time Submitted 161st bizy-coder 445 427 10ms 10 Sep 2024 162nd davecame 442 430 10ms 30 Dec 2025 163rd 5cw 🇺🇸 438 434 15ms 5 May 2024 164th 051 🇸🇬 436 436 10ms 15 Dec 2025 165th Seek64 🇩🇪 433 439 10ms 23 Nov 2025 166th ageneric 431 441 10ms 17 Jan 2022 166th jared-hughes 431 441 10ms 25 Mar 2022 168th bzijlema 🇳🇱 426 446 10ms 14 Oct 2024 169th bricknellj 425 447 10ms 22 Jul 2022 169th betaveros 425 447 10ms 29 Dec 2022 171st janbehrens 🇩🇪 424 448 10ms 17 Jun 2023 172nd mathisfun271 423 449 10ms 25 Dec 2023 172nd BenCarey88 423 449 11ms 3 Jan 2025 172nd ZorblaxV 423 449 11ms 4 Jan 2025 172nd maxgodfrey2004 🇨🇦 423 449 10ms 14 Feb 2025 172nd Lv0Sys 🇵🇱 423 449 10ms 25 Dec 2025 177th gnash117 422 450 10ms 29 Dec 2020 177th jonmsawyer 422 450 9ms 30 Dec 2020 177th scpchicken 🇵🇼 422 450 10ms 4 Feb 2023 180th PurkkaKoodari 🇫🇮 421 451 32ms 23 Nov 2024 181st DynamiteBear 420 452 10ms 24 Nov 2022 181st ahmetdemirag 🇨🇾 420 452 11ms 3 Oct 2025 183rd paralysedforce 419 454 9ms 7 Aug 2023 183rd aditya-u 419 454 9ms 6 Jul 2024 183rd Emutis 🇱🇹 419 454 10ms 26 Dec 2024 186th myfatemi04 418 455 10ms 1 Mar 2018 186th neihousaigaai 418 455 10ms 26 Dec 2021 186th AlephSquirrel 418 455 9ms 7 Jan 2023 186th SubsTheTechnomancer 418 455 11ms 28 Feb 2023 186th chartung17 418 455 11ms 31 Dec 2023 186th FranklinJiaChen 418 455 9ms 12 Jun 2024 186th souta-1326 418 455 11ms 27 Mar 2025 193rd NewDefectus 🇮🇱 417 456 9ms 8 Nov 2020 193rd yanjs 417 456 9ms 1 Oct 2021 193rd stefangimmillaro 417 456 11ms 18 Nov 2022 196th Haksell 🇦🇶 416 457 10ms 1 Dec 2019 196th solisolu 416 457 10ms 22 days ago 198th lordnord 415 458 10ms 2 May 2020 198th davitf 415 458 10ms 7 May 2020 198th knutae 🇳🇴 415 458 9ms 9 Feb 2022 198th M0PKOBKA 415 458 9ms 27 Dec 2022 198th drochom 415 458 10ms 16 Jun 2024 198th fourth-bit 415 458 10ms 25 Sep 2024 204th Liniarc 414 459 9ms 21 Nov 2024 204th dirckvdende 414 459 10ms 29 Jun 2025 206th marcin7Cd 413 460 9ms 11 Dec 2020 206th tooningelaere 413 460 10ms 4 Dec 2022 206th Fracture17 413 460 10ms 2 Apr 2023 206th CommandLeo 🇮🇹 413 460 10ms 4 Oct 2025 210th Faweks1 412 461 10ms 3 Aug 2018 210th elldur 412 461 10ms 17 Mar 2019 210th Indivicivet 412 461 9ms 26 Oct 2021 210th sultan 412 461 31ms 7 Jun 2022 210th driri85 412 461 34ms 16 Feb 2024 210th kalex 412 461 9ms 17 Jul 2024 216th daedals 411 462 10ms 19 Jun 2019 216th xbjfk 411 462 10ms 25 Nov 2020 216th tpaxman 🇨🇦 411 462 10ms 15 Dec 2020 216th myleopard 411 462 10ms 29 Jan 2021 216th Edjyzod 411 462 10ms 3 Oct 2022 221st TaserTheFox 🇺🇸 410 463 11ms 27 Apr 2023 221st JasonMcCallion 410 463 29ms 20 Dec 2023 221st CaedenHarper 🇨🇦 410 463 10ms 24 Jul 2024 224th dzhang314 409 464 10ms 14 Aug 2019 224th kurkale6ka 409 464 9ms 3 Dec 2023 224th Vaekor 409 464 10ms 7 Feb 2024 224th l-donovan 409 464 11ms 27 Jun 2024 228th stordev 409 465 11ms 26 Feb 2021 228th omkarjois 409 465 10ms 17 Oct 2021 228th rickypoon 409 465 10ms 22 Jul 2022 228th DrPiranoid 409 465 10ms 26 Sep 2022 228th joll05 🇸🇪 409 465 10ms 1 Nov 2022 228th erikji 409 465 9ms 3 Feb 2025 234th lrustand 408 466 9ms 3 Feb 2018 234th TobyBoyne 🇬🇧 408 466 9ms 1 Jun 2019 234th RDShah 408 466 10ms 2 Feb 2020 234th dim-an 408 466 10ms 8 Dec 2020 234th OllieBoyne 🇬🇧 408 466 9ms 31 Dec 2020 234th ihalseide 🇺🇸 408 466 9ms 5 Jun 2021 234th Anonymousellama21 408 466 9ms 9 May 2022 First Prev 161–240 of 1,169 Next Last
