The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
Look and Say 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 234th badboj40 531 113 10ms 26 Dec 2022 234th Techdude01 531 113 10ms 14 Feb 2023 234th yokasuretsu 531 113 10ms 9 Jan 2025 234th Pyroan 531 113 9ms 25 Feb 2025 245th geofft 526 114 10ms 10 Dec 2020 245th j-Ewan 526 114 10ms 11 Mar 2022 245th 40fied4t 526 114 10ms 17 May 2025 245th dirckvdende 526 114 12ms 25 Jul 2025 249th dahrens 522 115 10ms 13 May 2021 249th AbelPelser 522 115 9ms 2 Jul 2022 249th OppositeShark 522 115 10ms 20 Jul 2022 249th adamnielson42 🇺🇸 522 115 10ms 1 Jun 2023 249th Andrey2001 522 115 9ms 6 Dec 2025 254th LlamaLad7 🇬🇧 517 116 10ms 16 Jan 2021 254th SniperSmiley 🇺🇸 517 116 10ms 5 Sep 2022 254th MaxElf999 517 116 10ms 28 Sep 2022 254th RyGuy101 517 116 10ms 19 Jul 2023 254th anonymaew 517 116 12ms 2 Aug 2023 254th resoNathan 517 116 10ms 26 Apr 2024 254th BlankSpruce 517 116 11ms 3 Sep 2025 254th madeforlosers 517 116 10ms 11 Nov 2025 262nd ydevor 🇮🇱 513 117 10ms 3 Dec 2020 262nd raymur 513 117 10ms 26 Jan 2022 264th wrhm 508 118 15ms 12 Dec 2020 264th artieleach 508 118 10ms 8 Feb 2021 264th galloj 🇨🇿 508 118 10ms 17 Aug 2022 264th glesnick 508 118 11ms 18 Aug 2022 264th AstroOrbis 508 118 10ms 25 Nov 2025 269th VilBoub 504 119 10ms 17 Apr 2022 269th AlbertCoolGuy 504 119 10ms 3 Dec 2022 269th roguh 🇬🇹 504 119 11ms 9 Jan 2024 272nd ellis-rix 500 120 10ms 24 Feb 2022 272nd MichaelMBradley 🇨🇦 500 120 10ms 13 Apr 2022 272nd Alban-Boissard 500 120 11ms 14 Jun 2025 275th Pena86 496 121 10ms 19 Feb 2021 275th NanduBC 496 121 14ms 20 Mar 2021 275th lemogne 496 121 9ms 8 Aug 2021 275th tobyLovick 496 121 10ms 13 Dec 2023 279th b4dpxl 492 122 10ms 3 Nov 2021 280th ethandhunt 488 123 10ms 15 Aug 2021 281st Trunksistor 🇫🇷 484 124 11ms 22 Apr 2022 281st Eugen-str 484 124 10ms 1 Nov 2023 281st yuchuehw 484 124 10ms 18 Jan 2024 281st Stockoh 🇫🇷 484 124 11ms 26 Apr 2024 281st Rubiksmath 484 124 10ms 1 Oct 2024 281st calebaitken 484 124 15ms 17 Apr 2025 287th lmolteno 480 125 9ms 7 Mar 2021 287th matricronia 480 125 9ms 6 May 2021 287th clementblaudeau 480 125 12ms 5 Oct 2021 287th mathb0y512 480 125 10ms 26 Nov 2022 287th Florian-Mt 480 125 10ms 2 Oct 2023 292nd ValdeQwerty 476 126 10ms 31 May 2023 292nd starfihs 476 126 46ms 23 Feb 2025 294th mhenion8293 🇺🇸 472 127 10ms 19 Jan 2022 294th tooningelaere 472 127 10ms 4 Dec 2022 294th randolchance 472 127 10ms 24 Jan 2023 294th clemmers 🇺🇸 472 127 10ms 30 Jul 2023 294th brimstonetrader 472 127 10ms 18 Dec 2023 299th hjcafaroUC 469 128 11ms 29 May 2021 299th hymanimy 469 128 10ms 3 Aug 2021 299th AZ9tumas 469 128 48ms 12 Oct 2022 299th TheCod-r 🇦🇶 469 128 10ms 18 Feb 2023 303rd CodeAltF4 465 129 15ms 8 Mar 2022 303rd pmooreh 465 129 10ms 19 Aug 2022 305th michelebastione 🇮🇹 462 130 10ms 4 Dec 2020 305th Ellipsibus 462 130 10ms 9 Aug 2022 305th logvp 462 130 12ms 12 Jan 2024 305th geooff 462 130 10ms 11 May 2024 305th Mabeloid 🇳🇴 462 130 11ms 11 Sep 2024 310th Ailko 🇧🇪 458 131 12ms 6 May 2022 310th try-except-try-accept 🇹🇭 458 131 11ms 28 Jun 2022 310th Glinte 458 131 10ms 13 Dec 2023 313th wirewolf010 455 132 10ms 5 Jan 2022 313th ademdj19 455 132 10ms 12 Apr 2022 313th Bergschaf 455 132 9ms 24 Dec 2023 316th Andrey135296 451 133 10ms 23 Sep 2024 316th WillowWispy 451 133 22ms 17 Mar 2025 318th twocatsinatrenchcoat 448 134 11ms 12 Jul 2022 318th elephantpanda 448 134 11ms 31 Aug 2022 318th epic-programmer-guy 448 134 10ms 20 Dec 2023 First Prev 241–320 of 414 Next Last
