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 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 160th neihousaigaai 712 104 11ms 28 Mar 2021 160th Eilonlif 🇮🇱 712 104 11ms 11 Sep 2022 160th fbe 712 104 11ms 18 Oct 2023 160th jatloe 712 104 12ms 9 Sep 2024 165th bastienvoirin 🇫🇷 705 105 15ms 5 Dec 2020 165th RYNO8 705 105 10ms 27 Aug 2021 165th ejini6969 705 105 12ms 1 Apr 2023 165th stertooy 🇧🇪 705 105 10ms 14 Jun 2024 165th bnic24 705 105 10ms 31 Jul 2024 165th Artemis21 🇬🇧 705 105 12ms 21 Jan 2025 165th InigoK 🇺🇸 705 105 12ms 21 Aug 2025 172nd yzhs 🇩🇪 698 106 15ms 25 Dec 2020 172nd potato-jackson 698 106 15ms 5 Mar 2021 172nd Bonjour27891 🇻🇳 698 106 11ms 4 Mar 2022 172nd nstearns96 🇬🇧 698 106 15ms 23 Jan 2023 172nd jmerle 🇳🇱 698 106 16ms 16 Feb 2023 172nd Yewzir 🇧🇪 698 106 15ms 16 Apr 2023 172nd Bmrl7 698 106 12ms 24 Dec 2025 179th andre-lameirinhas 🇵🇹 692 107 36ms 14 Dec 2020 179th knutae 🇳🇴 692 107 10ms 15 Jul 2021 179th itsjustfreekie 692 107 10ms 21 Sep 2021 179th eshilo-draper 692 107 10ms 7 Nov 2022 179th mbittner20 692 107 10ms 27 May 2023 179th tobeannouncd 692 107 10ms 15 Sep 2023 179th elgan65536 🇺🇸 692 107 11ms 30 Mar 2024 179th BREMAUCY 🇫🇷 692 107 16ms 24 Apr 2024 179th Ythaenagor 692 107 10ms 5 Aug 2024 179th Emutis 🇱🇹 692 107 10ms 6 Aug 2025 179th wobblybits 692 107 15ms 16 Aug 2025 179th zgialor-lab 692 107 10ms 17 Dec 2025 191st abailey2020 🇺🇸 685 108 9ms 12 Dec 2020 191st ComputerKWasTaken 🇺🇸 685 108 10ms 15 Oct 2024 193rd argusdusty 🇺🇸 679 109 10ms 31 Dec 2020 193rd fynnkroeger 679 109 35ms 8 Feb 2021 193rd Starwort 🇬🇧 679 109 10ms 5 Mar 2021 193rd enbyte 679 109 10ms 7 Jun 2021 193rd jakobkordez 🇸🇮 679 109 10ms 10 Nov 2022 193rd b10011 🇫🇮 679 109 15ms 8 Jan 2023 193rd GulgDev 679 109 14ms 21 Mar 2023 193rd swtchblade 679 109 9ms 23 Jul 2025 201st boxjelly 673 110 15ms 12 Feb 2021 201st cesarm4 673 110 11ms 31 Aug 2021 201st Kloppermand 🇩🇰 673 110 16ms 28 Sep 2021 201st LeeCamp 673 110 12ms 15 Feb 2022 201st za3k 673 110 10ms 12 Oct 2022 201st lzahray 673 110 11ms 25 Oct 2022 201st Re-Adventures 🇮🇳 673 110 10ms 4 Jan 2023 201st luuumine 🇫🇷 673 110 10ms 1 Dec 2025 209th johnnythedoggie 667 111 10ms 29 Apr 2021 209th blamegames 667 111 10ms 16 May 2021 209th fgrosshans 🇫🇷 667 111 11ms 7 May 2023 209th rollershutter 667 111 12ms 11 Jul 2023 209th wk1093 667 111 10ms 18 Nov 2023 209th SoliGhost 667 111 10ms 10 Jun 2025 215th vezzick 661 112 11ms 4 Mar 2021 215th guilhem-roy 🇫🇷 661 112 11ms 28 Feb 2022 215th celiendonze 🇨🇭 661 112 10ms 18 Jul 2023 215th CutSandstone 661 112 11ms 4 Jul 2024 215th codingisgreatbutiamnot 661 112 10ms 7 Aug 2024 215th muser-logiccpu 🇺🇦 661 112 10ms 21 Aug 2025 221st jiaminglimjm 🇲🇾 655 113 11ms 6 Jan 2021 221st mothcolada 🇺🇸 655 113 10ms 21 Apr 2021 221st NicoAdams 655 113 10ms 5 Jan 2022 221st martinnorling 🇸🇪 655 113 13ms 21 Feb 2022 221st jfallon1997 655 113 10ms 8 Aug 2022 221st RandGuy 655 113 10ms 22 Nov 2022 221st jacksonhenry3 655 113 10ms 2 Dec 2022 221st badboj40 655 113 10ms 26 Dec 2022 221st Techdude01 655 113 10ms 14 Feb 2023 221st 2011-Chan-Ethan 655 113 11ms 9 Jul 2023 221st yokasuretsu 655 113 10ms 9 Jan 2025 221st Pyroan 655 113 9ms 25 Feb 2025 233rd geofft 649 114 10ms 10 Dec 2020 233rd j-Ewan 649 114 10ms 11 Mar 2022 233rd 40fied4t 649 114 10ms 17 May 2025 233rd dirckvdende 649 114 12ms 25 Jul 2025 237th dahrens 643 115 10ms 13 May 2021 237th AbelPelser 643 115 9ms 2 Jul 2022 237th OppositeShark 643 115 10ms 20 Jul 2022 237th adamnielson42 🇺🇸 643 115 10ms 1 Jun 2023 First Prev 161–240 of 414 Next Last
