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 241st nwellnhof 🇩🇪 898 55 280ms 6 Aug 2025 242nd JayXon 🇺🇸 896 52 273ms 62 mins ago 243rd JayXon 🇺🇸 896 114 157ms 3 May 2025 243rd acotis 896 114 166ms 21 Sep 2025 243rd kumavale 896 114 168ms 24 Nov 2025 246th JayXon 🇺🇸 895 94 391ms 1 Oct 2025 247th Steffan153 🇫🇮 894 60 2,700ms 25 hours ago 247th JayXon 🇺🇸 894 60 2,590ms 23 hours ago 249th nwellnhof 🇩🇪 894 80 388ms 27 Jul 2025 250th helbling 🇨🇭 893 73 10ms 4 Jan 2025 251st canissimia 🇦🇶 892 84 166ms 5 Jan 2025 251st ovs-code 🇩🇪 892 84 167ms 5 Jan 2025 251st DialFrost 🇸🇬 892 84 175ms 5 Jan 2025 251st Steffan153 🇫🇮 892 84 173ms 30 hours ago 255th nwellnhof 🇩🇪 892 94 438ms 28 Jul 2025 256th emplv 🇱🇻 890 98 12ms 6 Jan 2025 256th rucin93 🇵🇱 890 98 17ms 6 Jan 2025 256th sean-niemann 🇺🇸 890 98 11ms 5 Feb 2025 259th pardouin 🇫🇷 889 62 450ms 5 Jan 2025 259th GolfingSuccess 🇬🇷 889 62 376ms 24 Jan 2025 261st Steffan153 🇫🇮 888 115 163ms 119 mins ago 262nd nwellnhof 🇩🇪 888 123 294ms 28 Jul 2025 262nd JayXon 🇺🇸 888 123 301ms 28 Jul 2025 262nd Steffan153 🇫🇮 888 123 284ms 26 hours ago 265th JayXon 🇺🇸 887 95 3ms 9 Jan 2025 265th edsrzf 🇳🇿 887 95 2ms 9 Jan 2025 267th ovs-code 🇩🇪 886 42 5ms 5 Jan 2025 267th TheLastZombie 886 42 5ms 10 Jan 2025 267th blaztoma 🇱🇹 886 42 5ms 21 Sep 2025 270th nwellnhof 🇩🇪 886 95 484ms 25 Sep 2025 271st pardouin 🇫🇷 885 57 1,239ms 28 Jul 2025 271st Steffan153 🇫🇮 885 57 1,276ms 24 hours ago 273rd Steffan153 🇫🇮 882 51 8ms 25 hours ago 274th SirBogman 🇺🇸 881 24 2ms 9 Jan 2025 275th ovs-code 🇩🇪 881 52 76ms 3 Jan 2025 275th sean-niemann 🇺🇸 881 52 79ms 15 Feb 2026 275th JayXon 🇺🇸 881 52 74ms 16 Feb 2026 275th Steffan153 🇫🇮 881 52 75ms 16 Feb 2026 279th MeWhenI 🇻🇦 881 85 4ms 4 Jan 2025 279th sisyphus-ppcg 🇦🇺 881 85 4ms 5 Jan 2025 279th retrohun 881 85 4ms 5 Jan 2025 279th saito-ta 🇯🇵 881 85 4ms 12 Jan 2025 279th nwellnhof 🇩🇪 881 85 4ms 23 Jul 2025 279th jared-hughes 881 85 184ms 22 Sep 2025 285th vlpx 🇫🇮 881 99 11ms 6 Jan 2025 286th kurkale6ka 880 74 12ms 15 Dec 2025 287th ovs-code 🇩🇪 880 118 134ms 5 Jan 2025 287th lynn 880 118 136ms 6 Jan 2025 287th xnor-gate 880 118 128ms 6 Jan 2025 287th Sakisan 🇧🇪 880 118 129ms 6 Jun 2025 287th edsrzf 🇳🇿 880 118 150ms 21 Dec 2025 287th Steffan153 🇫🇮 880 118 138ms 27 hours ago 293rd Steffan153 🇫🇮 879 53 237ms 2 hours ago 294th sean-niemann 🇺🇸 875 63 358ms 15 Feb 2026 295th JayXon 🇺🇸 875 74 143ms 28 Jul 2025 296th Steffan153 🇫🇮 875 81 471ms 15 Feb 2026 296th JayXon 🇺🇸 875 81 444ms 15 Feb 2026 298th KasperKivimaeki 🇫🇮 873 96 441ms 4 Jan 2025 299th lynn 873 117 169ms 14 Nov 2025 300th ovs-code 🇩🇪 872 100 11ms 7 Jan 2025 301st stefangimmillaro 871 38 34ms 31 Dec 2024 301st Natanaelel 🇸🇪 871 38 36ms 3 Jan 2025 301st edsrzf 🇳🇿 871 38 34ms 5 Jan 2025 301st Shanethegamer 🇺🇸 871 38 36ms 5 Jan 2025 301st anter69 🇭🇺 871 38 33ms 6 Jan 2025 301st SirBogman 🇺🇸 871 38 34ms 15 Jan 2025 301st blaztoma 🇱🇹 871 38 42ms 21 Sep 2025 301st snoozingnewt 🇨🇦 871 38 34ms 15 Oct 2025 301st denkyuu1 871 38 33ms 31 Jan 2026 301st D-MOVE 🇵🇭 871 38 34ms 3 Feb 2026 311th andrewl64 869 75 11ms 25 Sep 2025 312th Steffan153 🇫🇮 868 73 99ms 8 hours ago 313th Steffan153 🇫🇮 867 97 372ms 3 hours ago 314th IISResetMe 866 57 299ms 7 Apr 2025 315th error256 865 100 27ms 10 May 2025 316th ovs-code 🇩🇪 864 82 450ms 5 Jan 2025 316th sean-niemann 🇺🇸 864 82 461ms 15 Feb 2026 318th ovs-code 🇩🇪 864 97 457ms 5 Jan 2025 319th MeWhenI 🇻🇦 864 101 12ms 26 Feb 2025 320th ovs-code 🇩🇪 863 54 300ms 15 Jul 2025 First Prev 241–320 of 1,069 Next Last