The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 30 hours. 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 478th OrangeBacon 384 495 10ms 31 Jul 2024 478th Unknownuserfrommars 384 495 9ms 7 Oct 2024 483rd YoungjuneKwon 383 496 10ms 20 Nov 2020 483rd asheeri 383 496 10ms 15 Aug 2021 483rd ramsay 383 496 10ms 8 Aug 2022 483rd jeaosh 383 496 10ms 22 Oct 2022 483rd fenix-bear 383 496 10ms 3 Jul 2023 483rd htareque 383 496 30ms 18 Oct 2023 483rd khavik 383 496 10ms 11 May 2024 483rd yashima 383 496 9ms 4 Nov 2024 483rd bogosorter 383 496 10ms 9 Jul 2025 483rd celiendonze 🇨🇭 383 496 10ms 18 Dec 2025 493rd kaylacomer 382 497 10ms 24 Oct 2021 493rd MCausc78 🇺🇦 382 497 10ms 5 Jan 2023 493rd ZoeyKD 382 497 9ms 14 May 2023 493rd xoxo-ily 382 497 10ms 12 Dec 2023 493rd aloobun 382 497 10ms 2 Dec 2024 498th SimonPeatman 382 498 10ms 29 Dec 2018 498th Arkaedan 382 498 9ms 27 Jul 2020 498th cesarm4 382 498 10ms 30 Aug 2021 498th n0es 382 498 10ms 6 Oct 2022 498th saoudi-h 382 498 10ms 12 Jan 2023 498th adamnielson42 🇺🇸 382 498 9ms 30 May 2023 498th ArchFin 382 498 9ms 21 Nov 2024 498th GeneralFabian 382 498 31ms 14 Dec 2024 498th energee 382 498 10ms 19 Dec 2024 498th Europe2048 382 498 9ms 17 Sep 2025 498th muratovm 382 498 10ms 10 Dec 2025 509th orifu 381 499 9ms 22 Feb 2021 509th Bombergames 381 499 10ms 21 Jan 2022 509th deerfarce 381 499 10ms 23 Dec 2022 509th bob-th 381 499 10ms 29 Dec 2022 509th DonCharlesLambert 381 499 11ms 15 Feb 2024 509th hiichbindermax 381 499 9ms 3 Sep 2024 509th jasonxue1 381 499 10ms 26 Jul 2025 509th yukii1004 381 499 10ms 25 Sep 2025 517th Psirving 380 500 10ms 20 Jul 2020 517th stephenuniverse 380 500 10ms 23 Aug 2021 517th Giridesh 380 500 10ms 3 Apr 2022 517th Bmrl7 380 500 9ms 19 Mar 2024 517th planeklm 380 500 10ms 17 Dec 2024 517th raymur 380 500 10ms 26 Jun 2025 517th oween12 380 500 11ms 6 Aug 2025 517th estrawitch 380 500 10ms 17 days ago 525th adoxography 379 501 9ms 30 Mar 2018 525th sambirnbaum1 379 501 11ms 7 Sep 2019 525th ArturLukianov 379 501 10ms 27 Dec 2020 525th suhasdara 379 501 11ms 11 Sep 2022 525th ceeb9 379 501 10ms 5 May 2023 525th DrPrettyman 379 501 10ms 31 May 2023 525th lucaswiman 379 501 10ms 13 Aug 2023 525th damoose717 379 501 10ms 23 May 2025 525th bknower 379 501 10ms 25 Jun 2025 534th djtuBIG-MaliceX 378 502 16ms 30 Jan 2018 534th The3gs 378 502 10ms 13 Oct 2020 534th 77Tigers 378 502 10ms 28 Feb 2021 534th b4dpxl 378 502 9ms 10 Nov 2021 534th BrenSchaap 378 502 10ms 11 Nov 2021 534th firegene 🇮🇪 378 502 10ms 16 Dec 2021 534th thiccaxe 378 502 10ms 2 Oct 2022 534th EyalLitvin 378 502 10ms 16 Nov 2022 534th mikehanus 378 502 9ms 21 Nov 2023 543rd kypi 378 503 10ms 20 Feb 2020 543rd bastienvoirin 🇫🇷 378 503 11ms 28 Nov 2020 543rd bbakersmith 378 503 10ms 26 Jul 2021 543rd HassanAliKadhem 🇧🇭 378 503 30ms 5 Jan 2022 543rd Expurple 378 503 10ms 8 Jan 2022 543rd johnellis1392 378 503 10ms 5 Jan 2024 543rd ImpressedByRocks 378 503 9ms 13 Mar 2024 543rd Benzamp 378 503 10ms 26 Feb 2026 551st ArturLange 377 504 10ms 31 Aug 2018 551st NoliHyd 377 504 9ms 11 Oct 2018 551st badboj40 377 504 9ms 18 Jan 2023 551st unknown25001 377 504 10ms 18 Jul 2024 551st PyryL 🇫🇮 377 504 9ms 12 Aug 2024 551st Marsolo1 377 504 10ms 24 Sep 2024 557th Smoncko 376 505 13ms 1 Feb 2023 557th jrbud 376 505 10ms 30 Dec 2023 557th xiaoyiming123 376 505 10ms 11 Aug 2025 557th OSYCh314 🇦🇺 376 505 10ms 12 Feb 2026 First Prev 481–560 of 1,171 Next Last
