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 155th Artemis21 🇬🇧 918 71 11ms 5 Jan 2025 155th croc54 918 71 11ms 5 Jan 2025 155th nstearns96 🇬🇧 918 71 11ms 6 Jan 2025 155th anter69 🇭🇺 918 71 10ms 6 Jan 2025 155th rollershutter 918 71 11ms 6 Jan 2025 155th BREMAUCY 🇫🇷 918 71 11ms 6 Jan 2025 155th HumanoidCPU 918 71 11ms 7 Jan 2025 155th moustave 918 71 11ms 7 Jan 2025 155th jmerle 🇳🇱 918 71 10ms 7 Jan 2025 155th NickTheEASDude 🇺🇸 918 71 11ms 8 Jan 2025 155th btjones0 918 71 10ms 11 Jan 2025 155th psaban 918 71 11ms 12 Jan 2025 155th scpchicken 🇵🇼 918 71 10ms 13 Jan 2025 155th jatloe 918 71 11ms 13 Jan 2025 155th neihousaigaai 918 71 10ms 13 Jan 2025 155th DGipe 918 71 11ms 13 Jan 2025 155th hiichbindermax 918 71 10ms 14 Jan 2025 155th rschwa6308 🇺🇸 918 71 11ms 14 Jan 2025 155th ImpressedByRocks 918 71 29ms 17 Jan 2025 155th primo-ppcg 🇹🇭 918 71 10ms 21 Jan 2025 155th davecame 918 71 11ms 29 Jan 2025 155th Pablitoz-Code 🇮🇹 918 71 11ms 29 Jan 2025 155th andrewjc2000 918 71 11ms 28 Feb 2025 155th Pyroan 918 71 10ms 7 Mar 2025 155th Troon 918 71 11ms 14 Mar 2025 155th souta-1326 918 71 10ms 25 Mar 2025 155th klixel 🇨🇦 918 71 12ms 30 Mar 2025 155th keegan-t 🇨🇦 918 71 11ms 17 Apr 2025 155th TheZwierzLF 🇵🇱 918 71 11ms 17 May 2025 155th connor-grady 918 71 11ms 18 May 2025 155th bknower 918 71 11ms 30 Jun 2025 155th albanian-laundromat 918 71 10ms 17 Jul 2025 155th RYSF13 🇨🇳 918 71 11ms 18 Jul 2025 155th muser-logiccpu 🇺🇦 918 71 11ms 24 Jul 2025 155th LuisGoncalves05 🇵🇹 918 71 11ms 27 Jul 2025 155th CamegaZFC 918 71 11ms 30 Jul 2025 155th shelerr 918 71 10ms 22 Aug 2025 155th InigoK 🇺🇸 918 71 11ms 28 Aug 2025 155th janlelis 918 71 12ms 22 Sep 2025 155th rustykitty 🇺🇸 918 71 10ms 28 Oct 2025 155th Cube14yt 918 71 10ms 13 Nov 2025 155th guilhem-roy 🇫🇷 918 71 11ms 22 Nov 2025 155th CommandLeo 🇮🇹 918 71 10ms 27 Nov 2025 155th JOrE20 918 71 10ms 7 Dec 2025 155th jkelly467 918 71 10ms 10 Dec 2025 155th Languag3 918 71 11ms 12 Dec 2025 155th Aquateraneal 🇺🇸 918 71 10ms 14 Feb 2026 208th lukegustafson 🇺🇸 918 95 11ms 11 Jan 2025 208th Steffan153 🇫🇮 918 95 11ms 32 hours ago 210th KasperKivimaeki 🇫🇮 915 73 5ms 3 Jan 2025 210th JayXon 🇺🇸 915 73 4ms 3 May 2025 212th DialFrost 🇸🇬 908 41 5ms 31 Dec 2024 212th TomvdPeet 908 41 5ms 3 Jan 2025 212th emplv 🇱🇻 908 41 5ms 3 Jan 2025 212th error256 908 41 4ms 5 Jan 2025 212th rucin93 🇵🇱 908 41 4ms 5 Jan 2025 212th alaaeelsayed 908 41 4ms 14 Jan 2025 212th KasperKivimaeki 🇫🇮 908 41 4ms 10 Dec 2025 219th Steffan153 🇫🇮 908 42 743ms 14 Feb 2026 219th GolfingSuccess 🇬🇷 908 42 740ms 15 Feb 2026 219th sean-niemann 🇺🇸 908 42 788ms 15 Feb 2026 219th xsot 🇸🇬 908 42 745ms 16 Feb 2026 223rd adamnielson42 🇺🇸 905 72 11ms 26 Jan 2025 223rd paulofreitas 905 72 10ms 10 May 2025 223rd LostSyntax21 🇬🇧 905 72 11ms 11 Jul 2025 223rd jacekwladzinski 905 72 10ms 2 Oct 2025 223rd solisolu 905 72 10ms 2 Nov 2025 223rd NoneTheFewer 905 72 11ms 27 Dec 2025 223rd theunofficialcoder 905 72 10ms 27 Dec 2025 223rd SectorCorruptor 905 72 11ms 3 Feb 2026 231st JayXon 🇺🇸 905 79 417ms 28 Jul 2025 231st Steffan153 🇫🇮 905 79 435ms 10 hours ago 233rd AdrienHache 🇫🇷 901 40 53ms 3 Dec 2025 234th JayXon 🇺🇸 901 56 1,446ms 28 Jul 2025 235th JayXon 🇺🇸 901 93 465ms 28 Jul 2025 236th GrayJoKing 🇦🇺 899 38 28ms 22 Mar 2025 237th error256 899 97 11ms 9 Jan 2025 237th nwellnhof 🇩🇪 899 97 11ms 27 Jul 2025 239th ovs-code 🇩🇪 898 40 32ms 4 Jan 2025 239th Frowny 898 40 33ms 26 Jan 2025 First Prev 161–240 of 1,073 Next Last