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 321st shibacho 🇯🇵 544 136 10ms 24 Nov 2022 321st jediroberthatch 544 136 10ms 1 Aug 2025 323rd Marthe-CC 540 137 10ms 9 Oct 2022 324th inverseLorentz 🇦🇺 536 138 10ms 23 May 2024 325th AlexanderFair 532 139 10ms 27 Jun 2023 325th ArenaGrenade 532 139 10ms 20 Feb 2024 325th Terobero 532 139 10ms 28 Aug 2024 328th tomh1012 529 140 10ms 2 Dec 2020 328th orifu 529 140 10ms 22 Feb 2021 328th 4ndyJ 🇬🇧 529 140 9ms 23 Dec 2022 331st lucasvanmol 525 141 10ms 4 Mar 2021 331st sleepyStick 525 141 10ms 11 Mar 2022 331st fl3ur1nestimable 525 141 10ms 9 May 2022 331st JesseNoEyes 🇺🇸 525 141 9ms 6 Mar 2025 335th Matherubik1 521 142 10ms 22 Jul 2021 335th amollberg 🇸🇪 521 142 10ms 22 Jan 2022 335th HumanEquivalentUnit 521 142 10ms 6 Feb 2022 338th mokymok 🇺🇸 514 144 11ms 20 Jul 2021 338th karhuthebear 514 144 9ms 5 May 2022 338th azure-blondon 514 144 9ms 4 Jul 2024 341st eiburns 510 145 10ms 10 Jan 2022 341st Vaekor 510 145 10ms 3 Aug 2023 341st namelessiw 510 145 11ms 5 Mar 2024 344th TobyBoyne 🇬🇧 500 148 10ms 2 Jan 2021 344th keegan-t 🇨🇦 500 148 10ms 8 Nov 2024 346th tpaxman 🇨🇦 497 149 44ms 9 Dec 2020 346th hinet60613 497 149 9ms 19 May 2021 346th jjbvtk 497 149 9ms 3 Sep 2021 346th bbakersmith 497 149 10ms 28 Jun 2022 346th Deedogg 497 149 10ms 30 Oct 2025 351st 0dyse 493 150 10ms 12 Sep 2025 351st vhoulbreque 🇫🇷 493 150 19ms 5 Dec 2025 353rd midnattssol 🇸🇪 490 151 10ms 27 Jul 2023 353rd PyryL 🇫🇮 490 151 10ms 21 Aug 2024 355th jassummisko 484 153 10ms 16 May 2022 355th Bananapants22 484 153 10ms 30 Aug 2022 355th alomiF 484 153 10ms 28 Sep 2023 358th QuincyNash 🇺🇸 481 154 10ms 11 Nov 2022 358th Pale-Vessel 481 154 10ms 1 Apr 2024 358th Andre3582 481 154 10ms 29 Sep 2025 361st r-benson 🇬🇧 477 155 10ms 27 Jan 2023 362nd pengu1n-master 474 156 10ms 11 Oct 2021 363rd rowboat1 471 157 10ms 24 Jun 2022 363rd osNiko 🇧🇷 471 157 10ms 15 Aug 2025 365th henrytranter 468 158 10ms 9 Feb 2021 366th janga1 463 160 10ms 17 Aug 2021 366th jameswmccarty 463 160 9ms 10 Jul 2024 368th mrmena 🇦🇺 460 161 11ms 5 Mar 2024 368th hamilton-bonds 460 161 10ms 12 Nov 2024 370th roupiq 🇵🇱 457 162 10ms 19 Feb 2024 371st georgehulme 448 165 10ms 2 Feb 2022 372nd NoahBolohan 🇨🇦 446 166 10ms 23 Feb 2023 373rd zwxzwxzwx21 440 168 9ms 30 Nov 2023 374th vtilde 438 169 9ms 9 Jan 2024 375th shinylego 430 172 10ms 6 Feb 2023 375th ESOrSomething 430 172 10ms 29 Sep 2025 377th jmmographer 418 177 10ms 26 Oct 2023 378th qwertzuioppel 413 179 17ms 2 Mar 2024 379th HalvorOverby 392 189 10ms 23 Dec 2021 379th jroscoe5 392 189 10ms 21 Sep 2022 381st atazzam 🇺🇸 387 191 10ms 17 Oct 2022 381st DrPrettyman 387 191 10ms 18 Jul 2023 383rd Yareeeema 383 193 10ms 13 Apr 2022 383rd evan18c 383 193 11ms 9 Nov 2024 385th NoneTheFewer 370 200 15ms 25 Dec 2025 386th ridingqwerty 🇺🇸 365 203 10ms 26 Dec 2023 387th kevinnaviapaiva 339 218 9ms 6 Mar 2025 388th dillon-duncando 319 232 10ms 3 Oct 2022 388th dylanjones92 319 232 9ms 19 Jan 2024 390th Dataen 311 238 9ms 12 Jan 2024 391st glf818 286 259 10ms 22 Jul 2021 392nd Demonarchet 279 265 10ms 1 May 2023 393rd cloudberry-DeaDev 275 269 10ms 23 Dec 2023 394th SchmulRosenzwe1g 274 270 10ms 15 Mar 2021 395th Hebelub 253 292 10ms 10 Jan 2024 396th camieac 🇬🇧 232 319 10ms 8 Jun 2023 397th pirxthepilot 217 341 10ms 31 Jan 2022 398th Ripick 201 368 10ms 7 Mar 2023 399th Zhenyu-Bo 176 421 10ms 31 Jul 2025 400th AidanWalter 170 435 10ms 3 Jan 2025 First Prev 321–400 of 414 Next Last