The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 44 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 640th CameronGBell 368 517 10ms 31 Oct 2022 640th b10011 🇫🇮 368 517 16ms 26 Dec 2022 640th M450NCH00 368 517 9ms 4 Feb 2023 640th resoNathan 368 517 10ms 8 Jul 2024 640th IoLimmer 368 517 9ms 11 Jul 2024 640th Brokames 368 517 10ms 6 Jun 2025 647th Daniel-Martin576 367 518 10ms 1 Apr 2020 647th andrewgopher 367 518 9ms 28 Jul 2021 647th dlee888 367 518 10ms 17 Nov 2023 647th karadigm01 367 518 10ms 1 Mar 2026 651st GodEmperorCaterpie 366 519 10ms 5 Sep 2019 651st lemogne 366 519 10ms 9 Aug 2021 651st ToE42 366 519 11ms 7 Sep 2021 651st 104210 366 519 9ms 9 Nov 2022 651st tmanternach 366 519 10ms 23 Nov 2022 651st marcus-gomes-v 🇧🇷 366 519 11ms 23 Feb 2025 651st bradye31 366 519 10ms 20 Nov 2025 651st kayaulai 366 519 10ms 23 Nov 2025 659th Stockoh 🇫🇷 365 520 9ms 11 May 2021 659th Kasci 365 520 10ms 28 Dec 2021 659th azure-blondon 365 520 10ms 25 Dec 2023 659th joao-parreira 365 520 31ms 24 Apr 2024 659th kejcao 🇨🇦 365 520 16ms 10 May 2024 659th Florian-Mt 365 520 9ms 4 Dec 2025 665th mothcolada 🇺🇸 365 521 11ms 11 Mar 2021 665th nikhil9302 365 521 10ms 21 Nov 2021 665th LeeCamp 365 521 10ms 11 Dec 2021 665th jhpaques 🇫🇷 365 521 10ms 28 Dec 2022 665th WillConker 365 521 11ms 14 Jul 2023 665th 0xkarambit 365 521 10ms 24 Feb 2026 671st HemangRajvanshy 364 522 10ms 1 Apr 2020 671st nmgetahun 364 522 10ms 5 Dec 2022 671st pde-bakk 🇳🇱 364 522 10ms 21 Oct 2023 671st raflemakt 364 522 10ms 3 Jan 2024 671st codingisgreatbutiamnot 364 522 10ms 29 Jul 2024 671st Kowalskiexe 🇵🇱 364 522 10ms 19 Apr 2025 677th nickrodgers42 363 523 10ms 2 Oct 2020 677th piebot3000 363 523 10ms 13 Sep 2023 677th IdkWhatIsIdk 363 523 10ms 28 Oct 2024 677th OyuDays 363 523 10ms 17 Mar 2025 677th AdamMorris377 363 523 10ms 1 Jan 2026 677th jusaka 363 523 10ms 10 days ago 683rd gardarjuto 363 524 10ms 16 Nov 2020 683rd xy3 🇮🇪 363 524 10ms 4 Jan 2022 683rd xenufo 363 524 10ms 14 Jul 2022 683rd james-downey 363 524 10ms 14 Jul 2022 683rd Argon1999 363 524 10ms 21 Oct 2022 688th NicoAdams 362 525 10ms 21 Nov 2021 688th sleepyStick 362 525 11ms 5 Apr 2022 688th ce-warren 362 525 10ms 26 Aug 2023 688th qwjhvbxi 362 525 11ms 5 Feb 2024 688th TheAtrossian 362 525 10ms 5 Jan 2025 688th HagenFritz 362 525 10ms 19 Jun 2025 694th babakoban 361 526 10ms 15 Aug 2019 694th ashwinvis 361 526 9ms 17 Apr 2020 694th hdformat 361 526 10ms 8 Jun 2020 694th mathwiz42 361 526 10ms 17 Aug 2020 694th confy 361 526 12ms 25 Oct 2020 694th dgambit 361 526 10ms 2 Apr 2021 694th goldstraw 361 526 10ms 30 Nov 2021 694th JohannaWarnqvist 361 526 10ms 13 Feb 2022 694th martinnorling 🇸🇪 361 526 10ms 28 Feb 2022 694th ezhereshchin 361 526 11ms 1 May 2022 694th fredoinsilico 361 526 9ms 7 Sep 2023 694th aviyanp 361 526 10ms 13 Oct 2025 694th ethanlchristensen 361 526 10ms 17 Oct 2025 694th ElieDeBrauwer 361 526 10ms 25 Oct 2025 708th asadullayev 361 527 10ms 8 Jan 2021 708th PYRiTEmonark 361 527 10ms 11 Mar 2021 708th BackslashWelsh 361 527 9ms 23 Jul 2021 708th TyKeeling 361 527 9ms 22 Jun 2022 708th SomeSomeOne99 361 527 10ms 26 Mar 2025 708th asarvazyan 361 527 10ms 22 Oct 2025 714th willzywiec 360 528 31ms 8 Aug 2018 714th ionutm82 360 528 10ms 9 Nov 2018 714th jhunterkohler 360 528 10ms 20 May 2021 714th elephantpanda 360 528 10ms 14 Oct 2022 714th sandorstormen 360 528 10ms 11 Mar 2023 714th fbe 360 528 10ms 11 Sep 2024 714th MasterGodzilla 360 528 16ms 26 Jun 2025 First Prev 641–720 of 1,170 Next Last
