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 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 Steffan153 🇫🇮 888 115 163ms 3 hours ago 162nd nwellnhof 🇩🇪 888 123 294ms 28 Jul 2025 162nd JayXon 🇺🇸 888 123 301ms 28 Jul 2025 162nd Steffan153 🇫🇮 888 123 284ms 27 hours ago 165th ovs-code 🇩🇪 886 42 5ms 5 Jan 2025 165th TheLastZombie 886 42 5ms 10 Jan 2025 165th blaztoma 🇱🇹 886 42 5ms 21 Sep 2025 168th nwellnhof 🇩🇪 886 95 484ms 25 Sep 2025 169th pardouin 🇫🇷 885 57 1,239ms 28 Jul 2025 169th Steffan153 🇫🇮 885 57 1,276ms 25 hours ago 171st SirBogman 🇺🇸 882 24 2ms 9 Jan 2025 172nd Steffan153 🇫🇮 882 51 8ms 26 hours ago 173rd ovs-code 🇩🇪 881 52 76ms 3 Jan 2025 173rd sean-niemann 🇺🇸 881 52 79ms 15 Feb 2026 173rd JayXon 🇺🇸 881 52 74ms 16 Feb 2026 173rd Steffan153 🇫🇮 881 52 75ms 16 Feb 2026 177th MeWhenI 🇻🇦 881 85 4ms 4 Jan 2025 177th sisyphus-ppcg 🇦🇺 881 85 4ms 5 Jan 2025 177th retrohun 881 85 4ms 5 Jan 2025 177th saito-ta 🇯🇵 881 85 4ms 12 Jan 2025 177th nwellnhof 🇩🇪 881 85 4ms 23 Jul 2025 177th jared-hughes 881 85 184ms 22 Sep 2025 183rd Steffan153 🇫🇮 880 51 230ms 4 hours ago 184th ovs-code 🇩🇪 880 118 134ms 5 Jan 2025 184th lynn 880 118 136ms 6 Jan 2025 184th xnor-gate 880 118 128ms 6 Jan 2025 184th Sakisan 🇧🇪 880 118 129ms 6 Jun 2025 184th edsrzf 🇳🇿 880 118 150ms 21 Dec 2025 184th Steffan153 🇫🇮 880 118 138ms 28 hours ago 190th JayXon 🇺🇸 875 74 143ms 28 Jul 2025 191st Steffan153 🇫🇮 875 81 471ms 15 Feb 2026 191st JayXon 🇺🇸 875 81 444ms 15 Feb 2026 193rd GolfingSuccess 🇬🇷 874 58 394ms 22 Jan 2025 193rd fuzzylojik-golf 🇺🇸 874 58 418ms 7 Jul 2025 193rd b-illy 🇬🇧 874 58 532ms 13 Jul 2025 193rd emgordon154 874 58 386ms 18 Jul 2025 193rd CornerMercury 🇬🇧 874 58 407ms 12 Oct 2025 193rd CaedenHarper 🇨🇦 874 58 382ms 30 Oct 2025 193rd sean-niemann 🇺🇸 874 58 376ms 15 Feb 2026 193rd dokutan 874 58 340ms 26 days ago 201st KasperKivimaeki 🇫🇮 873 96 441ms 4 Jan 2025 202nd lynn 873 117 169ms 14 Nov 2025 203rd stefangimmillaro 871 38 34ms 31 Dec 2024 203rd Natanaelel 🇸🇪 871 38 36ms 3 Jan 2025 203rd edsrzf 🇳🇿 871 38 34ms 5 Jan 2025 203rd Shanethegamer 🇺🇸 871 38 36ms 5 Jan 2025 203rd anter69 🇭🇺 871 38 33ms 6 Jan 2025 203rd SirBogman 🇺🇸 871 38 34ms 15 Jan 2025 203rd blaztoma 🇱🇹 871 38 42ms 21 Sep 2025 203rd snoozingnewt 🇨🇦 871 38 34ms 15 Oct 2025 203rd denkyuu1 871 38 33ms 31 Jan 2026 203rd D-MOVE 🇵🇭 871 38 34ms 3 Feb 2026 213th dmrichwa 🇺🇸 870 95 11ms 8 Jan 2025 213th KingSkyrock 🇺🇸 870 95 11ms 10 Jan 2025 215th Steffan153 🇫🇮 869 80 159ms 45 mins ago 216th Steffan153 🇫🇮 868 73 99ms 9 hours ago 217th Steffan153 🇫🇮 867 97 372ms 5 hours ago 218th IISResetMe 866 57 299ms 7 Apr 2025 219th error256 865 100 27ms 10 May 2025 220th ovs-code 🇩🇪 864 82 450ms 5 Jan 2025 220th sean-niemann 🇺🇸 864 82 461ms 15 Feb 2026 222nd ovs-code 🇩🇪 864 97 457ms 5 Jan 2025 223rd ovs-code 🇩🇪 863 52 300ms 15 Jul 2025 224th DialFrost 🇸🇬 862 35 2ms 31 Dec 2024 224th error256 862 35 2ms 13 Jan 2025 224th Natanaelel 🇸🇪 862 35 3ms 14 Jan 2025 224th nwellnhof 🇩🇪 862 35 2ms 14 Jan 2025 224th SirBogman 🇺🇸 862 35 3ms 15 Jan 2025 224th MeWhenI 🇻🇦 862 35 3ms 14 Feb 2025 224th fuzzylojik-golf 🇺🇸 862 35 3ms 16 May 2025 224th iczelia 🇩🇪 862 35 3ms 21 Sep 2025 224th denkyuu1 862 35 3ms 23 Feb 2026 233rd JayXon 🇺🇸 862 98 405ms 9 Jan 2025 234th Steffan153 🇫🇮 860 72 251ms 3 hours ago 234th JayXon 🇺🇸 860 72 260ms 2 hours ago 236th Steffan153 🇫🇮 860 82 7ms 29 hours ago 237th Babafaba 859 59 426ms 30 Oct 2025 238th error256 858 75 69ms 9 Jan 2025 239th Steffan153 🇫🇮 857 101 31ms 27 hours ago 240th JayXon 🇺🇸 856 107 168ms 9 Jan 2025 First Prev 161–240 of 1,065 Next Last