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?
ROT13 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 161st ovs-code 🇩🇪 886 42 5ms 5 Jan 2025 161st TheLastZombie 886 42 5ms 10 Jan 2025 161st blaztoma 🇱🇹 886 42 5ms 21 Sep 2025 164th pardouin 🇫🇷 885 57 1,239ms 28 Jul 2025 164th Steffan153 🇫🇮 885 57 1,276ms 7 hours ago 166th nwellnhof 🇩🇪 884 95 484ms 25 Sep 2025 167th Steffan153 🇫🇮 882 51 8ms 8 hours ago 168th SirBogman 🇺🇸 881 24 2ms 9 Jan 2025 169th ovs-code 🇩🇪 881 52 76ms 3 Jan 2025 169th sean-niemann 🇺🇸 881 52 79ms 15 Feb 2026 169th JayXon 🇺🇸 881 52 74ms 16 Feb 2026 169th Steffan153 🇫🇮 881 52 75ms 16 Feb 2026 173rd MeWhenI 🇻🇦 881 85 4ms 4 Jan 2025 173rd sisyphus-ppcg 🇦🇺 881 85 4ms 5 Jan 2025 173rd retrohun 881 85 4ms 5 Jan 2025 173rd saito-ta 🇯🇵 881 85 4ms 12 Jan 2025 173rd nwellnhof 🇩🇪 881 85 4ms 23 Jul 2025 173rd jared-hughes 881 85 184ms 22 Sep 2025 179th ovs-code 🇩🇪 880 118 134ms 5 Jan 2025 179th lynn 880 118 136ms 6 Jan 2025 179th xnor-gate 880 118 128ms 6 Jan 2025 179th Sakisan 🇧🇪 880 118 129ms 6 Jun 2025 179th edsrzf 🇳🇿 880 118 150ms 21 Dec 2025 179th Steffan153 🇫🇮 880 118 138ms 10 hours ago 185th ovs-code 🇩🇪 877 52 300ms 15 Jul 2025 186th JayXon 🇺🇸 875 74 143ms 28 Jul 2025 187th Steffan153 🇫🇮 875 81 471ms 15 Feb 2026 187th JayXon 🇺🇸 875 81 444ms 15 Feb 2026 189th GolfingSuccess 🇬🇷 873 58 394ms 22 Jan 2025 189th fuzzylojik-golf 🇺🇸 873 58 418ms 7 Jul 2025 189th b-illy 🇬🇧 873 58 532ms 13 Jul 2025 189th emgordon154 873 58 386ms 18 Jul 2025 189th CornerMercury 🇬🇧 873 58 407ms 12 Oct 2025 189th CaedenHarper 🇨🇦 873 58 382ms 30 Oct 2025 189th sean-niemann 🇺🇸 873 58 376ms 15 Feb 2026 189th dokutan 873 58 340ms 25 days ago 197th KasperKivimaeki 🇫🇮 873 96 441ms 4 Jan 2025 198th lynn 872 117 169ms 14 Nov 2025 199th stefangimmillaro 871 38 34ms 31 Dec 2024 199th Natanaelel 🇸🇪 871 38 36ms 3 Jan 2025 199th edsrzf 🇳🇿 871 38 34ms 5 Jan 2025 199th Shanethegamer 🇺🇸 871 38 36ms 5 Jan 2025 199th anter69 🇭🇺 871 38 33ms 6 Jan 2025 199th SirBogman 🇺🇸 871 38 34ms 15 Jan 2025 199th blaztoma 🇱🇹 871 38 42ms 21 Sep 2025 199th snoozingnewt 🇨🇦 871 38 34ms 15 Oct 2025 199th denkyuu1 871 38 33ms 31 Jan 2026 199th D-MOVE 🇵🇭 871 38 34ms 3 Feb 2026 209th dmrichwa 🇺🇸 870 95 10ms 8 Jan 2025 209th KingSkyrock 🇺🇸 870 95 10ms 10 Jan 2025 211th IISResetMe 866 57 299ms 7 Apr 2025 212th error256 865 100 27ms 10 May 2025 213th ovs-code 🇩🇪 864 82 450ms 5 Jan 2025 213th sean-niemann 🇺🇸 864 82 461ms 15 Feb 2026 215th ovs-code 🇩🇪 864 97 457ms 5 Jan 2025 216th JayXon 🇺🇸 863 84 165ms 16 Feb 2026 217th DialFrost 🇸🇬 862 35 2ms 31 Dec 2024 217th error256 862 35 2ms 13 Jan 2025 217th Natanaelel 🇸🇪 862 35 3ms 14 Jan 2025 217th nwellnhof 🇩🇪 862 35 2ms 14 Jan 2025 217th SirBogman 🇺🇸 862 35 3ms 15 Jan 2025 217th MeWhenI 🇻🇦 862 35 3ms 14 Feb 2025 217th fuzzylojik-golf 🇺🇸 862 35 3ms 16 May 2025 217th iczelia 🇩🇪 862 35 3ms 21 Sep 2025 217th denkyuu1 862 35 3ms 23 Feb 2026 226th JayXon 🇺🇸 862 98 405ms 9 Jan 2025 227th Steffan153 🇫🇮 860 82 7ms 11 hours ago 228th Babafaba 859 59 426ms 30 Oct 2025 229th error256 858 75 69ms 9 Jan 2025 229th edsrzf 🇳🇿 858 75 105ms 1 Dec 2025 231st Steffan153 🇫🇮 857 101 31ms 9 hours ago 232nd JayXon 🇺🇸 856 107 168ms 9 Jan 2025 233rd edsrzf 🇳🇿 854 99 405ms 9 Jul 2025 234th canissimia 🇦🇶 854 113 6ms 10 Mar 2025 235th JayXon 🇺🇸 853 73 279ms 24 May 2025 236th Steffan153 🇫🇮 853 99 15ms 6 hours ago 237th m-tkach 🇺🇦 853 118 26ms 9 Jan 2025 238th Steffan153 🇫🇮 852 76 137ms 9 hours ago 239th error256 852 97 12ms 9 Jan 2025 239th nwellnhof 🇩🇪 852 97 11ms 27 Jul 2025 First Prev 161–240 of 1,050 Next Last