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?
Rule 110 in all languages 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 inventshah 807 122 262ms 18 Jul 2023 322nd SirBogman 🇺🇸 806 72 187ms 28 Nov 2022 323rd Flekay 🇩🇪 806 85 13ms 19 days ago 323rd snoozingnewt 🇨🇦 806 85 13ms 17 days ago 325th NewDefectus 🇮🇱 804 71 41ms 18 Nov 2021 326th emgordon154 803 201 47ms 10 Jun 2025 327th ovs-code 🇩🇪 802 109 70ms 20 Sep 2023 328th GolfingSuccess 🇬🇷 801 173 42ms 13 hours ago 329th JohandeRuiter 🇳🇱 800 100 7ms 27 Oct 2023 330th The3gs 800 123 135ms 28 Nov 2024 331st kg583 🇺🇸 800 130 77ms 30 Apr 2025 332nd primo-ppcg 🇹🇭 800 140 129ms 17 Oct 2020 333rd Shanethegamer 🇺🇸 798 132 3ms 29 Jan 2025 334th KasperKivimaeki 🇫🇮 798 161 273ms 8 Oct 2025 335th KenanSi 796 49 4ms 23 Feb 2022 336th NewDefectus 🇮🇱 796 86 11ms 18 Nov 2021 337th emplv 🇱🇻 795 91 12ms 20 Jul 2022 338th lynn 794 156 28ms 21 Jul 2023 339th jared-hughes 793 72 41ms 10 Sep 2022 340th emgordon154 793 153 17ms 15 Dec 2024 341st jared-hughes 792 133 2ms 21 Jul 2022 342nd nwellnhof 🇩🇪 792 139 426ms 18 Jan 2026 343rd prplz 🇦🇺 790 123 67ms 4 Jan 2022 344th AlephSquirrel 788 132 23ms 6 Oct 2024 345th retrohun 787 87 28ms 18 Jul 2018 345th SirBogman 🇺🇸 787 87 11ms 28 Nov 2022 345th Natanaelel 🇸🇪 787 87 11ms 6 Aug 2023 348th Attero 🇸🇪 784 102 6ms 10 Jun 2020 349th 4hg 🇺🇸 783 52 34ms 3 Aug 2023 350th antimon2 🇯🇵 783 80 673ms 29 Oct 2022 351st tailorspy 783 124 402ms 20 Sep 2024 352nd Shanethegamer 🇺🇸 782 140 43ms 14 Jun 2022 353rd elgan65536 🇺🇸 781 126 238ms 7 Feb 2026 354th Attero 🇸🇪 780 135 4ms 5 Apr 2020 355th sean-niemann 🇺🇸 779 165 304ms 6 May 2024 356th jacklynnepenick 778 88 198ms 26 Aug 2021 356th Command-Master 778 88 14ms 29 Sep 2023 358th Command-Master 777 125 441ms 29 Sep 2023 359th albanian-laundromat 775 122 76ms 28 Aug 2025 360th SirBogman 🇺🇸 773 85 506ms 20 Jan 2024 360th snoozingnewt 🇨🇦 773 85 392ms 17 days ago 362nd SirBogman 🇺🇸 773 119 40ms 2 Nov 2022 363rd Irratix 🇳🇱 771 74 37ms 21 Apr 2022 363rd MeWhenI 🇻🇦 771 74 41ms 26 May 2023 365th CatsAreFluffy 771 78 51ms 6 Jan 2023 366th edsrzf 🇳🇿 770 167 283ms 22 Feb 2026 367th jared-hughes 769 89 16ms 17 Feb 2022 368th igmcdowell 769 94 15ms 20 Dec 2021 368th vlpx 🇫🇮 769 94 10ms 23 Sep 2024 370th sean-niemann 🇺🇸 769 128 195ms 8 Jun 2025 371st Alex-x90 🇺🇸 769 137 3ms 11 Feb 2023 372nd sean-niemann 🇺🇸 765 144 478ms 26 Sep 2025 373rd andersk 🇺🇸 763 129 134ms 6 Jan 2020 374th TobyBoyne 🇬🇧 761 90 13ms 7 Apr 2022 375th DialFrost 🇸🇬 759 107 108ms 5 Jul 2025 376th m-tkach 🇺🇦 759 128 67ms 15 Dec 2022 377th itsh01 753 96 11ms 6 Sep 2022 377th DialFrost 🇸🇬 753 96 11ms 23 Jan 2024 377th trinityy-7 753 96 12ms 21 Mar 2024 380th primo-ppcg 🇹🇭 753 143 120ms 23 Jan 2020 381st Irratix 🇳🇱 752 91 15ms 9 Dec 2022 381st prplz 🇦🇺 752 91 174ms 29 Jan 2023 381st cykim8811 752 91 15ms 11 Jul 2024 384th edsrzf 🇳🇿 752 140 4ms 16 Feb 2025 385th MichalMarsalek 🇨🇿 752 149 342ms 16 Feb 2022 386th blaztoma 🇱🇹 749 152 110ms 4 Dec 2025 387th sean-niemann 🇺🇸 747 130 66ms 28 Dec 2023 388th didion0 🇺🇸 746 97 12ms 18 Apr 2022 388th emgordon154 746 97 10ms 3 Aug 2025 390th timvermeulen 746 132 126ms 7 Jan 2020 391st moustave 744 92 10ms 4 Jun 2025 391st InigoK 🇺🇸 744 92 16ms 22 Aug 2025 393rd Waffle3z 742 142 4ms 18 Oct 2020 394th m-tkach 🇺🇦 742 167 25ms 5 May 2025 395th MeWhenI 🇻🇦 740 80 1,371ms 25 Oct 2022 396th Alex-x90 🇺🇸 739 148 44ms 28 Apr 2024 397th weliveinhell 🇭🇹 738 98 11ms 2 Sep 2023 398th snoozingnewt 🇨🇦 738 146 134ms 19 Nov 2025 399th Yax42 🇫🇷 737 110 414ms 10 Sep 2025 400th glesnick 736 93 15ms 15 Jul 2022 First Prev 321–400 of 1,671 Next Last