The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 days. Why not try and solve them ahead of time?
All holes in Perl 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 Holes Points Bytes Submitted 241st ssteffl 1 845 420 28 Mar 2021 242nd flappyBug 1 841 44 14 Jul 2025 243rd britishben 1 840 50 16 Nov 2018 243rd Xrymz 1 840 50 5 Apr 2019 243rd ishyv 1 840 50 2 Jul 2022 246th samhilluk 1 829 35 30 Nov 2020 247th duckyluuk 🇳🇱 1 828 29 16 Jul 2025 248th shibacho 🇯🇵 2 827 251 25 Mar 2022 249th prak132 1 824 51 28 Feb 2023 250th giacomogallina 1 822 45 2 Jun 2019 251st Supplantor 1 814 436 22 Dec 2017 252nd commandz0 🇺🇸 1 808 52 27 Aug 2022 252nd Just4FunCoder 1 808 52 4 Feb 2026 254th simon-biber 1 806 36 19 May 2022 255th SubsTheTechnomancer 1 796 446 21 Mar 2023 256th caromdreamer 1 792 53 4 Oct 2022 257th PommesSchranke 1 771 48 5 Jun 2021 258th keelimeguy 🇺🇸 1 764 55 23 Oct 2023 259th Tsuk1w 🇫🇷 2 756 203 9 Nov 2022 260th tungstengmd 1 755 49 18 Feb 2026 261st Davidebyzero 1 750 28 27 Dec 2019 261st NatNgs 1 750 28 9 Jan 2020 261st SnowballSH 1 750 28 28 Jan 2021 261st ozefe 🇹🇷 1 750 28 28 Oct 2021 261st QuincyNash 🇺🇸 1 750 28 21 Jan 2022 261st 4hg 🇺🇸 1 750 28 19 Mar 2023 261st frankgraziano 1 750 28 21 Apr 2025 268th dylanarmstrong 1 750 56 18 Dec 2023 269th Indivicivet 1 737 57 18 Mar 2021 269th neuhaus 1 737 57 12 Nov 2022 271st sciencejiho 3 729 2,048 29 Apr 2024 272nd lyphyser 1 724 58 9 Oct 2023 273rd cokernel 1 723 491 14 Sep 2025 274th biotinker 1 711 38 25 Jan 2018 275th roguh 🇬🇹 1 707 41 14 Jan 2024 276th sampatakumar 1 704 504 8 Feb 2026 277th alichraghi 1 700 30 14 Oct 2021 278th Simon3995 🇳🇱 1 700 60 10 Jun 2020 278th sumbloke 1 700 60 9 Feb 2021 280th tcoard 1 692 39 25 Jan 2018 281st arctouch-cristiannevianna 2 688 252 9 Nov 2023 282nd SirHig 1 687 517 2 Jan 2019 283rd user189032 1 685 54 14 Jun 2019 284th adamnielson42 🇺🇸 2 680 1,053 12 Dec 2023 285th andre-lameirinhas 🇵🇹 1 673 55 22 Nov 2022 286th TheSecondComing123 1 671 79 26 days ago 287th ToriTheChicken 2 667 1,052 31 Jul 2020 288th willzywiec 1 656 32 11 Aug 2018 288th villfa 1 656 32 26 Apr 2019 288th Eolu 1 656 32 27 Apr 2020 288th Stockoh 🇫🇷 1 656 32 5 Jun 2021 288th lifthrasiir 🇰🇷 1 656 32 22 Nov 2024 293rd loganmacdougall 🇨🇦 1 656 64 12 Nov 2021 294th Alfiecxn 🇬🇧 2 655 2,723 13 Oct 2024 295th MatheusAvellar 🇧🇷 1 649 37 8 May 2021 296th timretout 2 647 463 11 Aug 2017 297th bac0id 11 647 10,936 26 Jun 2024 298th mothcolada 🇺🇸 8 645 7,166 1 Apr 2021 299th MiranDaniel 🇨🇿 2 644 186 2 Sep 2023 300th RustemB 🇷🇺 2 644 1,043 21 May 2020 301st JOrE-Softwares 2 643 1,042 3 Jun 2025 302nd dymowski 2 642 1,055 14 Jul 2019 303rd FlorianCassayre 🇫🇷 1 641 39 11 Sep 2023 304th doge1338 1 636 33 15 Dec 2020 305th qwertyuiop3 🇷🇺 1 636 44 4 Jun 2025 306th PowershellKnut 🇳🇴 2 635 166 7 Jan 2024 307th kevinnaviapaiva 2 630 228 14 Mar 2025 308th tehmoth 1 627 67 18 Oct 2017 309th Herbert00709 🇵🇱 1 622 45 10 Apr 2024 310th AgathokakologicalBit 1 618 34 14 Jul 2019 310th Juici 1 618 34 24 Sep 2020 310th lowlighter 1 618 34 1 Nov 2020 310th Fmbalbuena 1 618 34 20 Sep 2021 310th Shorter-Than-Short 1 618 34 16 Nov 2024 315th lukeme 1 609 69 30 Sep 2020 316th jjatria 1 592 71 2 Jul 2020 316th citrus-lemon 1 592 71 5 Mar 2022 316th namelessiw 1 592 71 25 Jul 2023 319th Xaerxess 1 591 44 9 Feb 2023 320th jprobichaud 1 591 298 2 Jul 2021 First Prev 241–320 of 490 Next Last