The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 25 hours. Why not try and solve them ahead of time?
Rule 110 in all languages 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 721st MeWhenI 🇻🇦 510 117 946ms 15 Sep 2025 722nd Salutations45 510 138 10ms 30 Dec 2024 723rd hemphen 510 155 395ms 29 Aug 2022 724th mokymok 🇺🇸 508 114 19ms 11 Oct 2021 724th hiichbindermax 508 114 11ms 17 Sep 2024 726th aksyristos 507 152 7ms 30 Jan 2023 727th yzhs 🇩🇪 507 155 130ms 26 Jul 2021 728th Waffle3z 506 107 38ms 22 Jan 2021 728th KatieLG 🇬🇧 506 107 44ms 11 Apr 2022 730th KatieLG 🇬🇧 506 209 132ms 15 Jan 2023 731st Shanethegamer 🇺🇸 505 115 559ms 2 Jul 2021 732nd Shanethegamer 🇺🇸 505 205 54ms 20 Oct 2024 733rd giacomogallina 504 115 23ms 14 Jun 2019 733rd cellobix 504 115 18ms 15 Aug 2019 733rd dzhang314 504 115 17ms 15 Aug 2019 733rd rollershutter 504 115 19ms 26 Nov 2023 733rd 1231234md5 🇨🇳 504 115 18ms 25 Jan 2024 733rd CutSandstone 504 115 16ms 5 Jul 2024 733rd KasperKivimaeki 🇫🇮 504 115 14ms 7 Jul 2025 740th boxjelly 504 153 6ms 17 Feb 2021 740th janbehrens 🇩🇪 504 153 6ms 25 Oct 2021 742nd boxjelly 504 156 147ms 27 Jan 2021 743rd MeWhenI 🇻🇦 504 251 304ms 10 Feb 2023 744th MeWhenI 🇻🇦 504 273 1,771ms 7 Nov 2025 745th ArmaanAS 502 140 10ms 5 Feb 2021 745th raphaelimahorn 502 140 10ms 2 Oct 2021 745th ShiraJoseph 🇺🇸 502 140 10ms 15 Oct 2023 748th snoozingnewt 🇨🇦 502 158 90ms 22 Oct 2025 749th MeWhenI 🇻🇦 502 192 134ms 11 Sep 2022 750th madex 🇩🇪 501 154 6ms 16 Jan 2021 750th elttil 501 154 6ms 28 Jan 2026 752nd NicoAdams 499 116 11ms 22 Nov 2021 752nd NerdyMcNerd42 499 116 11ms 27 Oct 2022 752nd jtaxen 499 116 18ms 21 Apr 2024 755th charliegaming 499 141 10ms 4 Oct 2023 755th dokutan 499 141 11ms 5 Jun 2025 757th n1LS 497 109 42ms 27 Sep 2019 758th Protothor 492 143 11ms 16 days ago 759th sambirnbaum1 491 118 12ms 29 Oct 2019 759th boxjelly 491 118 13ms 17 Jan 2021 759th andrewjc2000 491 118 11ms 8 Mar 2025 759th StefanHabel 🇨🇦 491 118 11ms 21 days ago 763rd JDiLenarda 🇫🇷 491 161 411ms 20 Nov 2023 764th Dominoscompute 490 208 39ms 20 Apr 2023 765th Attero 🇸🇪 490 217 439ms 15 May 2020 766th msbranicky 489 197 133ms 3 Oct 2024 767th TheZwierzLF 🇵🇱 488 111 88ms 5 Jan 2026 768th alemelis 488 119 237ms 29 Sep 2024 769th quimey 487 119 18ms 23 Aug 2023 769th alemelis 487 119 11ms 14 Sep 2024 771st janbehrens 🇩🇪 487 148 117ms 5 Aug 2021 772nd janbehrens 🇩🇪 486 148 7ms 3 Jul 2023 773rd dokutan 486 219 383ms 24 Sep 2025 774th Aurel300 🇨🇭 484 199 174ms 20 Jun 2024 775th knutae 🇳🇴 483 120 11ms 3 Dec 2021 775th adamnielson42 🇺🇸 483 120 220ms 4 May 2023 777th LukeBridges 🇬🇧 482 146 12ms 23 May 2023 778th retrohun 482 160 6ms 20 Jun 2019 779th roavin 482 164 374ms 8 Jul 2022 780th dokutan 482 192 6ms 28 Sep 2024 781st Skepfyr 482 200 216ms 4 Jan 2020 782nd retrohun 481 102 10ms 1 Jan 2023 783rd neel11235813 479 113 43ms 17 Mar 2023 784th Indivicivet 479 121 17ms 22 Oct 2021 784th Bonjour27891 🇻🇳 479 121 15ms 13 Mar 2022 784th FortuiteMan 🇫🇷 479 121 19ms 17 Sep 2023 787th ei14 479 161 6ms 9 May 2024 788th msbranicky 479 184 11ms 3 Oct 2024 789th IISResetMe 478 131 466ms 9 Jan 2026 790th elisherer 🇮🇱 478 147 14ms 13 Apr 2019 790th Kibble 478 147 13ms 11 Jul 2020 790th Maznek 478 147 13ms 12 Jun 2023 793rd CaedenHarper 🇨🇦 478 265 305ms 3 Nov 2025 794th rak1507 🇬🇧 477 165 170ms 13 Feb 2021 794th the-zammers 477 165 141ms 15 Dec 2023 796th orthoplex 🇨🇽 476 331 25ms 9 Jun 2024 797th AGoyet 475 122 13ms 16 Jul 2022 797th GodlyProgrammer1 475 122 12ms 21 Nov 2025 799th Shanethegamer 🇺🇸 475 132 271ms 27 Apr 2022 800th guliyevemil1 🇦🇿 474 166 146ms 16 Apr 2020 First Prev 721–800 of 1,659 Next Last