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 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 80th Steffan153 🇫🇮 933 64 852ms 15 Feb 2026 80th edsrzf 🇳🇿 933 64 845ms 15 Feb 2026 83rd primo-ppcg 🇹🇭 933 77 24ms 3 Jul 2023 84th neel11235813 928 60 387ms 10 Mar 2024 84th lifthrasiir 🇰🇷 928 60 410ms 2 Dec 2024 86th GrayJoKing 🇦🇺 927 63 26ms 20 Feb 2022 87th acotis 927 104 132ms 1 Jun 2025 88th edsrzf 🇳🇿 926 80 3ms 3 Dec 2025 89th Bubbler-4 925 40 5ms 21 Feb 2022 90th prplz 🇦🇺 925 76 13ms 20 May 2022 90th Irratix 🇳🇱 925 76 12ms 24 Jan 2023 92nd primo-ppcg 🇹🇭 925 78 2,886ms 22 Jan 2025 93rd stefangimmillaro 925 115 533ms 6 Oct 2025 94th JayXon 🇺🇸 924 103 65ms 14 Mar 2023 95th GrayJoKing 🇦🇺 923 112 3ms 3 Apr 2023 96th inventshah 922 62 1,485ms 28 Oct 2023 97th 2bular 921 43 63ms 4 hours ago 98th JayXon 🇺🇸 921 63 1,994ms 29 Jun 2021 99th bitsandbeyond 🇳🇱 921 68 470ms 23 days ago 100th GrayJoKing 🇦🇺 921 85 128ms 30 Oct 2023 101st sean-niemann 🇺🇸 920 68 136ms 30 Apr 2025 102nd primo-ppcg 🇹🇭 920 78 247ms 15 Nov 2022 102nd xsot 🇸🇬 920 78 8ms 9 Feb 2024 104th m-tkach 🇺🇦 919 63 11ms 12 Jun 2024 104th CornerMercury 🇬🇧 919 63 18ms 26 Nov 2025 104th ndren 919 63 14ms 26 Nov 2025 107th Lydxn 🇨🇦 915 97 486ms 8 Mar 2022 107th JayXon 🇺🇸 915 97 460ms 8 Mar 2022 109th ovs-code 🇩🇪 915 104 66ms 8 Jun 2024 110th sean-niemann 🇺🇸 914 81 3ms 23 Aug 2025 111th MeWhenI 🇻🇦 914 86 78ms 16 Aug 2024 111th ovs-code 🇩🇪 914 86 23ms 13 Oct 2024 113th inventshah 913 61 484ms 15 Jan 2024 113th emgordon154 913 61 453ms 3 Aug 2025 115th NewDefectus 🇮🇱 913 77 13ms 18 Nov 2021 116th GrayJoKing 🇦🇺 913 84 100ms 1 Nov 2023 117th DialFrost 🇸🇬 911 87 90ms 1 Jul 2025 118th primo-ppcg 🇹🇭 910 112 200ms 8 Feb 2021 118th zacjl 910 112 28ms 8 Apr 2025 120th stefangimmillaro 910 139 299ms 19 Sep 2024 121st GrayJoKing 🇦🇺 908 94 63ms 9 Dec 2025 121st error256 908 94 65ms 28 Dec 2025 123rd KasperKivimaeki 🇫🇮 907 85 62ms 8 Nov 2025 124th stefangimmillaro 907 102 6ms 30 Sep 2024 125th sean-niemann 🇺🇸 906 114 2ms 23 Dec 2025 125th Steffan153 🇫🇮 906 114 2ms 11 Feb 2026 127th ovs-code 🇩🇪 905 98 467ms 8 Mar 2022 127th Steffan153 🇫🇮 905 98 496ms 23 Jul 2024 129th edsrzf 🇳🇿 905 114 312ms 22 Jun 2025 130th GrayJoKing 🇦🇺 903 89 21ms 8 Feb 2025 131st stefangimmillaro 903 99 2,629ms 20 Nov 2024 132nd lynn 903 111 1,333ms 15 Sep 2021 133rd SirBogman 🇺🇸 902 41 3ms 28 Nov 2022 134th Argeento 🇵🇱 902 78 18ms 8 Sep 2023 135th dvargas46 🇺🇸 902 80 35ms 12 Dec 2022 136th edsrzf 🇳🇿 902 105 41ms 24 Oct 2025 137th stefangimmillaro 901 103 125ms 13 Nov 2022 138th JayXon 🇺🇸 901 107 134ms 23 Apr 2025 139th canissimia 🇦🇶 901 163 14ms 17 Dec 2022 140th 4hg 🇺🇸 900 44 34ms 19 Mar 2023 141st primo-ppcg 🇹🇭 900 100 40ms 15 May 2025 142nd inventshah 899 98 11ms 28 Dec 2023 143rd JayXon 🇺🇸 899 111 168ms 5 Sep 2023 144th edsrzf 🇳🇿 898 87 9ms 12 days ago 144th GrayJoKing 🇦🇺 898 87 9ms 10 days ago 146th inventshah 897 106 62ms 4 Feb 2023 147th edsrzf 🇳🇿 897 110 8ms 27 Feb 2025 148th primo-ppcg 🇹🇭 896 86 7ms 26 Apr 2019 148th inventshah 896 86 6ms 24 Jan 2023 150th stefangimmillaro 896 118 1,116ms 29 Sep 2023 151st GrayJoKing 🇦🇺 896 136 126ms 31 Mar 2023 152nd dcgjb 895 70 326ms 26 Feb 2024 152nd nwellnhof 🇩🇪 895 70 395ms 27 Oct 2024 154th GrayJoKing 🇦🇺 895 120 45ms 28 Apr 2024 155th GrayJoKing 🇦🇺 893 56 417ms 24 Aug 2020 156th canissimia 🇦🇶 892 55 5ms 24 Jul 2023 157th Lydxn 🇨🇦 892 83 3ms 9 Feb 2023 157th GrayJoKing 🇦🇺 892 83 3ms 1 Nov 2023 159th kg583 🇺🇸 892 116 44ms 15 Mar 2025 159th edsrzf 🇳🇿 892 116 43ms 9 Apr 2025 First Prev 81–160 of 1,658 Next Last