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?
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 81st Lydxn 🇨🇦 949 66 335ms 14 Dec 2021 81st ovs-code 🇩🇪 949 66 297ms 7 May 2024 83rd 2bular 947 43 63ms 7 hours ago 84th AdrienHache 🇫🇷 942 86 439ms 13 Sep 2025 85th lyphyser 940 64 53ms 30 Jul 2023 86th sisyphus-ppcg 🇦🇺 939 63 1,473ms 9 Dec 2022 86th DialFrost 🇸🇬 939 63 1,372ms 13 Apr 2025 88th inventshah 939 77 13ms 23 Feb 2023 88th Alex-x90 🇺🇸 939 77 12ms 23 Feb 2023 90th DialFrost 🇸🇬 938 70 416ms 16 Jan 2024 90th inventshah 938 70 535ms 20 Jan 2024 90th lynn 938 70 438ms 17 Feb 2024 90th kg583 🇺🇸 938 70 369ms 30 Jan 2025 94th primo-ppcg 🇹🇭 938 73 169ms 5 Oct 2020 94th bricknellj 938 73 10ms 3 Jan 2023 94th ZakkkkAttackkkk 🇵🇭 938 73 10ms 20 Feb 2025 97th lynn 938 86 156ms 22 Nov 2021 97th HPWiz 🇳🇿 938 86 159ms 22 Nov 2021 99th nwellnhof 🇩🇪 937 69 1,074ms 17 Sep 2023 100th GrayJoKing 🇦🇺 936 62 417ms 1 Jul 2021 100th Lydxn 🇨🇦 936 62 141ms 22 May 2022 102nd primo-ppcg 🇹🇭 935 50 114ms 8 Dec 2022 102nd AlephSquirrel 935 50 70ms 31 Dec 2022 104th sean-niemann 🇺🇸 935 66 749ms 15 Feb 2026 104th Steffan153 🇫🇮 935 66 852ms 15 Feb 2026 104th edsrzf 🇳🇿 935 66 845ms 15 Feb 2026 107th primo-ppcg 🇹🇭 935 79 24ms 3 Jul 2023 108th Bubbler-4 929 42 5ms 21 Feb 2022 109th GrayJoKing 🇦🇺 929 65 26ms 20 Feb 2022 110th acotis 928 106 132ms 1 Jun 2025 111th prplz 🇦🇺 927 78 13ms 20 May 2022 111th Irratix 🇳🇱 927 78 12ms 24 Jan 2023 111th stefangimmillaro 927 78 12ms 19 Sep 2024 114th primo-ppcg 🇹🇭 927 80 2,886ms 22 Jan 2025 115th ovs-code 🇩🇪 925 71 445ms 16 Jan 2024 115th neel11235813 925 71 374ms 31 Mar 2024 115th lifthrasiir 🇰🇷 925 71 428ms 4 Dec 2024 118th emgordon154 925 74 11ms 3 Aug 2025 119th JayXon 🇺🇸 925 105 65ms 14 Mar 2023 120th stefangimmillaro 925 119 533ms 6 Oct 2025 121st inventshah 924 64 1,485ms 28 Oct 2023 122nd bitsandbeyond 🇳🇱 924 70 470ms 23 days ago 123rd JayXon 🇺🇸 924 80 153ms 11 Aug 2024 124th GrayJoKing 🇦🇺 924 114 3ms 3 Apr 2023 125th canissimia 🇦🇶 923 59 5ms 24 Jul 2023 126th GrayJoKing 🇦🇺 923 86 129ms 30 Oct 2023 127th primo-ppcg 🇹🇭 922 63 537ms 21 Dec 2020 128th JayXon 🇺🇸 922 68 1,994ms 29 Jun 2021 129th primo-ppcg 🇹🇭 922 80 247ms 15 Nov 2022 130th KasperKivimaeki 🇫🇮 920 87 62ms 8 Nov 2025 131st GolfingSuccess 🇬🇷 917 51 85ms 2 Sep 2022 132nd edsrzf 🇳🇿 917 97 3ms 28 Aug 2025 133rd NewDefectus 🇮🇱 916 79 13ms 18 Nov 2021 134th Lydxn 🇨🇦 916 99 486ms 8 Mar 2022 134th JayXon 🇺🇸 916 99 460ms 8 Mar 2022 136th ovs-code 🇩🇪 916 106 66ms 8 Jun 2024 137th CornerMercury 🇬🇧 913 75 16ms 26 Nov 2025 137th ndren 913 75 12ms 26 Nov 2025 139th Steffan153 🇫🇮 913 81 152ms 4 Aug 2024 140th ovs-code 🇩🇪 913 89 100ms 19 Dec 2025 141st GrayJoKing 🇦🇺 912 72 388ms 16 Jan 2024 141st Alex-x90 🇺🇸 912 72 457ms 16 Jan 2024 141st emgordon154 912 72 455ms 3 Aug 2025 144th primo-ppcg 🇹🇭 912 114 200ms 8 Feb 2021 144th zacjl 912 114 28ms 8 Apr 2025 146th stefangimmillaro 912 141 299ms 19 Sep 2024 147th sisyphus-ppcg 🇦🇺 911 58 5ms 22 May 2022 148th xsot 🇸🇬 911 81 9ms 9 Feb 2024 149th Steffan153 🇫🇮 911 94 87ms 12 Feb 2026 150th GrayJoKing 🇦🇺 910 96 63ms 9 Dec 2025 150th error256 910 96 65ms 28 Dec 2025 152nd inventshah 909 88 6ms 4 Feb 2023 153rd stefangimmillaro 909 104 6ms 30 Sep 2024 154th sisyphus-ppcg 🇦🇺 908 98 3ms 6 Feb 2023 154th ovs-code 🇩🇪 908 98 4ms 7 Feb 2023 154th Lydxn 🇨🇦 908 98 3ms 9 Feb 2023 154th Steffan153 🇫🇮 908 98 3ms 7 Mar 2023 154th GrayJoKing 🇦🇺 908 98 3ms 3 Apr 2023 154th sean-niemann 🇺🇸 908 98 3ms 9 May 2025 160th sean-niemann 🇺🇸 908 116 2ms 23 Dec 2025 First Prev 81–160 of 1,670 Next Last