The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 days. Why not try and solve them ahead of time?
Kolakoski Sequence 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 239th MichaelMBradley 🇨🇦 634 82 9ms 18 Feb 2022 239th Andrey2001 634 82 12ms 6 Dec 2025 243rd Brianzhengca 627 83 10ms 1 Feb 2021 243rd hymanimy 627 83 11ms 24 Aug 2021 243rd nullie 627 83 10ms 9 Jun 2022 243rd a-penton 627 83 11ms 22 Sep 2022 247th gXLg 🇩🇪 619 84 18ms 22 Oct 2022 247th dylanjones92 619 84 10ms 19 Jan 2024 249th mikehanus 612 85 10ms 29 Jan 2024 249th alexeldridge 612 85 11ms 17 Aug 2024 249th JunkIce 612 85 17ms 4 Oct 2024 252nd adoxography 605 86 41ms 23 Jan 2021 252nd mokymok 🇺🇸 605 86 10ms 23 Nov 2021 252nd 40fied4t 605 86 12ms 15 May 2025 255th boxjelly 598 87 10ms 21 Jan 2021 255th amollberg 🇸🇪 598 87 13ms 3 Jan 2022 255th randolchance 598 87 10ms 11 Feb 2023 255th taesungh 598 87 11ms 20 Oct 2023 259th tnecio 591 88 12ms 18 Jul 2021 259th Jacob385 591 88 43ms 22 Apr 2024 261st MichalMarsalek 🇨🇿 584 89 11ms 30 Aug 2022 261st za3k 584 89 249ms 28 Oct 2022 263rd tomh1012 578 90 12ms 23 Feb 2021 263rd RaBa21 🇭🇺 578 90 11ms 18 Jul 2025 265th j-Ewan 571 91 15ms 11 Mar 2022 265th QuincyNash 🇺🇸 571 91 11ms 17 Nov 2022 267th myleopard 565 92 11ms 13 Oct 2021 267th cafehaine 🇫🇷 565 92 11ms 23 May 2022 267th glesnick 565 92 41ms 18 Aug 2022 270th AforAmpere 559 93 11ms 24 Feb 2021 270th sreyfe 559 93 12ms 6 Jun 2024 270th TheZwierzLF 🇵🇱 559 93 75ms 23 Nov 2025 273rd CodyMiner 547 95 42ms 11 Nov 2021 273rd MyApaulogies 547 95 9ms 26 Dec 2021 273rd madeforlosers 547 95 12ms 11 Nov 2025 276th midnattssol 🇸🇪 542 96 10ms 27 Jul 2023 277th raphaelimahorn 536 97 11ms 10 Aug 2021 277th Foxinatel 536 97 10ms 22 Aug 2021 279th yuchuehw 520 100 18ms 18 Jan 2024 280th Pena86 505 103 9ms 20 Feb 2021 280th janga1 505 103 11ms 18 Aug 2021 282nd eiburns 500 104 33ms 10 Jan 2022 282nd Vaekor 500 104 34ms 3 Aug 2023 284th Unknownuserfrommars 473 110 10ms 5 Aug 2025 285th bbakersmith 456 114 10ms 18 Jul 2021 285th bac0id 456 114 11ms 30 Jun 2024 287th dgambit 452 115 11ms 2 Apr 2021 287th mdnestor 452 115 25ms 14 Dec 2022 289th 4ndyJ 🇬🇧 448 116 11ms 31 Jan 2024 290th Bananapants22 441 118 9ms 30 Aug 2022 291st henrytranter 437 119 17ms 10 Feb 2021 291st maggym00 437 119 10ms 29 Apr 2021 291st dillon-duncando 437 119 11ms 3 Oct 2022 294th sleepyStick 419 124 27ms 11 Mar 2022 295th johndixon01 403 129 10ms 23 Sep 2022 295th brimstonetrader 403 129 10ms 13 Nov 2024 297th mothcolada 🇺🇸 394 132 12ms 10 Mar 2021 298th shinylego 382 136 9ms 19 Oct 2022 299th asadullayev 371 140 10ms 4 Mar 2021 300th kevinnaviapaiva 351 148 10ms 14 Feb 2025 301st Techdude01 347 150 11ms 19 Dec 2022 302nd atazzam 🇺🇸 319 163 10ms 3 Sep 2022 303rd DrPrettyman 313 166 11ms 10 Jul 2023 304th artieleach 308 169 12ms 7 Feb 2021 305th c0d3-4-F00d 🇩🇪 272 191 13ms 10 Jul 2021 306th Mikey-Beep 🇬🇧 239 218 11ms 2 Sep 2024 307th tpasfieldERAU 215 242 11ms 11 Apr 2023 308th Zhenyu-Bo 206 253 9ms 31 Jul 2025 309th Just4FunCoder 179 290 17ms 27 Oct 2022 310th AidanWalter 129 404 10ms 28 Nov 2025 311th cingulataluke 103 506 11ms 3 Jun 2024 312th sayloren 96 542 11ms 6 Aug 2021 313th yhm138 70 745 11ms 17 Feb 2025 314th Jaydosu 51 1,010 10ms 25 Oct 2021 314th karhuthebear 51 1,010 10ms 11 May 2022 316th retrohun 51 1,022 10ms 27 Dec 2022 317th thomashastings 26 2,008 10ms 21 Apr 2021 317th theunofficialcoder 26 2,008 10ms 6 Aug 2021 317th KatieLG-Transpiler 🇬🇧 26 2,008 9ms 23 Jun 2022 317th zt14427 26 2,008 10ms 28 Oct 2023 First Prev 241–320 of 323 Next Last
