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 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 241st MeWhenI 🇻🇦 831 114 8ms 9 May 2024 242nd stefangimmillaro 831 116 122ms 18 May 2025 243rd edsrzf 🇳🇿 829 123 24ms 3 Dec 2025 244th nwellnhof 🇩🇪 827 51 4ms 24 Jul 2023 245th ovs-code 🇩🇪 827 70 14ms 8 Mar 2022 245th SirBogman 🇺🇸 827 70 11ms 28 Nov 2022 245th 5cw 🇺🇸 827 70 10ms 2 Jan 2024 245th zacjl 827 70 12ms 30 Jan 2025 245th edsrzf 🇳🇿 827 70 10ms 18 Jun 2025 250th sean-niemann 🇺🇸 827 95 89ms 29 Dec 2024 250th emgordon154 827 95 19ms 6 Jun 2025 252nd marshallward 🇺🇸 826 109 41ms 23 Dec 2024 253rd m-tkach 🇺🇦 825 157 25ms 15 Dec 2022 254th emgordon154 825 191 47ms 10 Jun 2025 255th SirBogman 🇺🇸 824 76 327ms 18 May 2024 256th sisyphus-ppcg 🇦🇺 823 46 59ms 25 Jul 2022 256th MeWhenI 🇻🇦 823 46 91ms 24 Aug 2022 256th saito-ta 🇯🇵 823 46 189ms 11 Oct 2022 259th DialFrost 🇸🇬 823 136 122ms 3 Dec 2025 260th razetime 822 45 4ms 12 Jan 2022 260th GolfingSuccess 🇬🇷 822 45 4ms 13 Jan 2022 260th Steffan153 🇫🇮 822 45 4ms 10 Feb 2023 260th Natanaelel 🇸🇪 822 45 4ms 14 Jul 2023 264th inventshah 821 108 464ms 9 Jan 2024 265th inventshah 820 129 130ms 23 Oct 2023 266th DialFrost 🇸🇬 819 68 416ms 16 Jan 2024 266th lynn 819 68 438ms 17 Feb 2024 266th snoozingnewt 🇨🇦 819 68 355ms 17 days ago 269th nathanadams 🇳🇿 818 86 12ms 23 Sep 2021 269th jared-hughes 818 86 12ms 17 Feb 2022 271st ScottHamper 818 130 536ms 30 Nov 2025 272nd bricknellj 816 71 10ms 3 Jan 2023 272nd Flekay 🇩🇪 816 71 14ms 15 Feb 2026 274th primo-ppcg 🇹🇭 816 121 169ms 6 Aug 2023 275th IanUtley 815 96 36ms 2 Nov 2023 276th tomtheisen 🇺🇸 815 97 399ms 30 Jan 2023 277th inventshah 814 114 136ms 22 Oct 2023 278th stefangimmillaro 813 127 123ms 23 Sep 2024 279th Steffan153 🇫🇮 812 150 28ms 2 hours ago 280th primo-ppcg 🇹🇭 810 119 139ms 12 Jun 2020 280th edsrzf 🇳🇿 810 119 190ms 5 Apr 2025 282nd lynn 808 49 35ms 18 Apr 2021 283rd ETHproductions 🇺🇸 808 87 12ms 9 Jul 2018 284th Shanethegamer 🇺🇸 808 95 167ms 19 Mar 2023 285th primo-ppcg 🇹🇭 808 124 1,420ms 30 Nov 2021 286th ovs-code 🇩🇪 807 69 445ms 16 Jan 2024 287th DialFrost 🇸🇬 807 74 744ms 5 Sep 2025 287th CaedenHarper 🇨🇦 807 74 1,132ms 9 Dec 2025 289th SirBogman 🇺🇸 806 47 47ms 28 Nov 2022 289th ovs-code 🇩🇪 806 47 57ms 25 Feb 2025 291st DialFrost 🇸🇬 806 72 309ms 8 May 2024 292nd Alex-x90 🇺🇸 805 115 278ms 19 Oct 2023 293rd lifthrasiir 🇰🇷 804 46 2ms 5 Dec 2024 294th prplz 🇦🇺 803 78 401ms 6 Jul 2020 295th inventshah 803 120 262ms 18 Jul 2023 296th inventshah 800 129 127ms 23 Oct 2023 297th emplv 🇱🇻 799 88 14ms 20 Jul 2022 298th lynn 799 98 10ms 18 Nov 2021 299th GolfingSuccess 🇬🇷 799 171 40ms 115 mins ago 300th albanian-laundromat 798 116 76ms 28 Aug 2025 301st The3gs 797 121 135ms 28 Nov 2024 302nd kg583 🇺🇸 797 128 77ms 30 Apr 2025 303rd KasperKivimaeki 🇫🇮 796 159 273ms 8 Oct 2025 304th GrayJoKing 🇦🇺 795 70 388ms 16 Jan 2024 304th Alex-x90 🇺🇸 795 70 457ms 16 Jan 2024 306th jared-hughes 795 130 3ms 20 Mar 2022 306th Shanethegamer 🇺🇸 795 130 3ms 29 Jan 2025 308th lynn 791 154 28ms 21 Jul 2023 309th didion0 🇺🇸 790 89 12ms 18 Apr 2022 310th AlephSquirrel 789 48 70ms 31 Dec 2022 311th Waffle3z 789 131 4ms 8 Apr 2022 312th nwellnhof 🇩🇪 788 135 426ms 18 Jan 2026 313th KenanSi 787 47 4ms 23 Feb 2022 314th Attero 🇸🇪 787 98 6ms 10 Jun 2020 314th JohandeRuiter 🇳🇱 787 98 7ms 27 Oct 2023 316th prplz 🇦🇺 786 121 67ms 4 Jan 2022 317th NewDefectus 🇮🇱 785 69 41ms 18 Nov 2021 318th AlephSquirrel 784 130 23ms 6 Oct 2024 319th prplz 🇦🇺 783 74 200ms 21 Oct 2019 319th Irratix 🇳🇱 783 74 17ms 7 May 2022 First Prev 241–320 of 1,659 Next Last