The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
ROT13 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 239th 2bular 898 40 32ms 15 Oct 2025 242nd nwellnhof 🇩🇪 898 55 280ms 6 Aug 2025 243rd JayXon 🇺🇸 896 52 273ms 14 hours ago 244th JayXon 🇺🇸 896 114 157ms 3 May 2025 244th acotis 896 114 166ms 21 Sep 2025 244th kumavale 896 114 168ms 24 Nov 2025 247th JayXon 🇺🇸 895 94 391ms 1 Oct 2025 248th Steffan153 🇫🇮 894 60 2,700ms 38 hours ago 248th JayXon 🇺🇸 894 60 2,590ms 37 hours ago 250th nwellnhof 🇩🇪 894 80 388ms 27 Jul 2025 251st helbling 🇨🇭 893 73 10ms 4 Jan 2025 252nd canissimia 🇦🇶 892 84 166ms 5 Jan 2025 252nd ovs-code 🇩🇪 892 84 167ms 5 Jan 2025 252nd DialFrost 🇸🇬 892 84 175ms 5 Jan 2025 252nd Steffan153 🇫🇮 892 84 173ms 43 hours ago 256th nwellnhof 🇩🇪 892 94 438ms 28 Jul 2025 257th emplv 🇱🇻 890 98 12ms 6 Jan 2025 257th rucin93 🇵🇱 890 98 17ms 6 Jan 2025 257th sean-niemann 🇺🇸 890 98 11ms 5 Feb 2025 260th pardouin 🇫🇷 889 62 450ms 5 Jan 2025 260th GolfingSuccess 🇬🇷 889 62 376ms 24 Jan 2025 262nd JayXon 🇺🇸 888 95 3ms 9 Jan 2025 262nd edsrzf 🇳🇿 888 95 2ms 9 Jan 2025 262nd Steffan153 🇫🇮 888 95 3ms 12 hours ago 265th Steffan153 🇫🇮 888 115 163ms 15 hours ago 266th nwellnhof 🇩🇪 888 123 294ms 28 Jul 2025 266th JayXon 🇺🇸 888 123 301ms 28 Jul 2025 266th Steffan153 🇫🇮 888 123 284ms 39 hours ago 269th ovs-code 🇩🇪 886 42 5ms 5 Jan 2025 269th TheLastZombie 886 42 5ms 10 Jan 2025 269th blaztoma 🇱🇹 886 42 5ms 21 Sep 2025 272nd nwellnhof 🇩🇪 886 95 484ms 25 Sep 2025 273rd pardouin 🇫🇷 885 57 1,239ms 28 Jul 2025 273rd Steffan153 🇫🇮 885 57 1,276ms 37 hours ago 275th SirBogman 🇺🇸 882 24 2ms 9 Jan 2025 276th Steffan153 🇫🇮 882 51 8ms 38 hours ago 277th ovs-code 🇩🇪 881 52 76ms 3 Jan 2025 277th sean-niemann 🇺🇸 881 52 79ms 15 Feb 2026 277th JayXon 🇺🇸 881 52 74ms 16 Feb 2026 277th Steffan153 🇫🇮 881 52 75ms 16 Feb 2026 281st MeWhenI 🇻🇦 881 85 4ms 4 Jan 2025 281st sisyphus-ppcg 🇦🇺 881 85 4ms 5 Jan 2025 281st retrohun 881 85 4ms 5 Jan 2025 281st saito-ta 🇯🇵 881 85 4ms 12 Jan 2025 281st nwellnhof 🇩🇪 881 85 4ms 23 Jul 2025 281st jared-hughes 881 85 184ms 22 Sep 2025 287th vlpx 🇫🇮 881 99 11ms 6 Jan 2025 288th kurkale6ka 880 74 12ms 15 Dec 2025 289th ovs-code 🇩🇪 880 118 134ms 5 Jan 2025 289th lynn 880 118 136ms 6 Jan 2025 289th xnor-gate 880 118 128ms 6 Jan 2025 289th Sakisan 🇧🇪 880 118 129ms 6 Jun 2025 289th edsrzf 🇳🇿 880 118 150ms 21 Dec 2025 289th Steffan153 🇫🇮 880 118 138ms 40 hours ago 295th Steffan153 🇫🇮 879 53 230ms 15 hours ago 296th sean-niemann 🇺🇸 875 63 358ms 15 Feb 2026 297th JayXon 🇺🇸 875 74 143ms 28 Jul 2025 298th Steffan153 🇫🇮 875 81 471ms 15 Feb 2026 298th JayXon 🇺🇸 875 81 444ms 15 Feb 2026 300th KasperKivimaeki 🇫🇮 873 96 441ms 4 Jan 2025 301st lynn 873 117 169ms 14 Nov 2025 302nd ovs-code 🇩🇪 872 100 11ms 7 Jan 2025 303rd stefangimmillaro 871 38 34ms 31 Dec 2024 303rd Natanaelel 🇸🇪 871 38 36ms 3 Jan 2025 303rd edsrzf 🇳🇿 871 38 34ms 5 Jan 2025 303rd Shanethegamer 🇺🇸 871 38 36ms 5 Jan 2025 303rd anter69 🇭🇺 871 38 33ms 6 Jan 2025 303rd SirBogman 🇺🇸 871 38 34ms 15 Jan 2025 303rd blaztoma 🇱🇹 871 38 42ms 21 Sep 2025 303rd snoozingnewt 🇨🇦 871 38 34ms 15 Oct 2025 303rd denkyuu1 871 38 33ms 31 Jan 2026 303rd D-MOVE 🇵🇭 871 38 34ms 3 Feb 2026 313th andrewl64 869 75 11ms 25 Sep 2025 314th Steffan153 🇫🇮 869 80 159ms 12 hours ago 314th JayXon 🇺🇸 869 80 148ms 10 hours ago 316th Steffan153 🇫🇮 868 73 99ms 21 hours ago 317th Steffan153 🇫🇮 867 97 372ms 17 hours ago 318th IISResetMe 866 57 299ms 7 Apr 2025 319th error256 865 100 27ms 10 May 2025 320th ovs-code 🇩🇪 864 82 450ms 5 Jan 2025 First Prev 241–320 of 1,074 Next Last