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 74th targrik 931 40 5ms 3 Jul 2025 74th edsrzf 🇳🇿 931 40 5ms 9 Jul 2025 74th Steffan153 🇫🇮 931 40 5ms 16 Feb 2026 84th HumanoidCPU 929 61 11ms 7 Jan 2025 84th klixel 🇨🇦 929 61 11ms 9 Jan 2025 84th Artemis21 🇬🇧 929 61 11ms 10 Jan 2025 84th jatloe 929 61 11ms 13 Jan 2025 84th Pablitoz-Code 🇮🇹 929 61 10ms 29 Jan 2025 84th anter69 🇭🇺 929 61 11ms 3 Feb 2025 84th BREMAUCY 🇫🇷 929 61 12ms 11 Feb 2025 84th TheZwierzLF 🇵🇱 929 61 11ms 18 May 2025 84th KatieLG 🇬🇧 929 61 11ms 25 May 2025 84th FortuiteMan 🇫🇷 929 61 12ms 20 Jun 2025 84th LostSyntax21 🇬🇧 929 61 11ms 11 Jul 2025 84th albanian-laundromat 929 61 10ms 17 Jul 2025 84th RYSF13 🇨🇳 929 61 10ms 18 Jul 2025 84th JOrE20 929 61 11ms 7 Dec 2025 98th JayXon 🇺🇸 929 89 11ms 28 Jul 2025 99th nwellnhof 🇩🇪 928 71 5ms 28 Jul 2025 100th ovs-code 🇩🇪 921 39 102ms 4 Jan 2025 100th lynn 921 39 101ms 6 Jan 2025 100th sisyphus-ppcg 🇦🇺 921 39 97ms 6 Jan 2025 100th pardouin 🇫🇷 921 39 104ms 7 Jan 2025 100th tatzyr 🇯🇵 921 39 98ms 1 Mar 2025 100th sean-niemann 🇺🇸 921 39 108ms 15 Feb 2026 100th JayXon 🇺🇸 921 39 97ms 16 Feb 2026 100th Steffan153 🇫🇮 921 39 96ms 16 Feb 2026 108th JayXon 🇺🇸 921 55 418ms 5 Jan 2025 108th kg583 🇺🇸 921 55 372ms 9 Jul 2025 108th Steffan153 🇫🇮 921 55 376ms 25 days ago 111th radarek 🇵🇱 920 36 40ms 3 Jan 2025 111th error256 920 36 41ms 3 Jan 2025 111th emgordon154 920 36 46ms 5 Jan 2025 111th Lydxn 🇨🇦 920 36 40ms 23 Jan 2025 115th lukegustafson 🇺🇸 919 90 10ms 11 Jan 2025 115th Steffan153 🇫🇮 919 90 11ms 4 hours ago 117th KasperKivimaeki 🇫🇮 915 72 5ms 3 Jan 2025 117th JayXon 🇺🇸 915 72 4ms 3 May 2025 119th DialFrost 🇸🇬 908 41 5ms 31 Dec 2024 119th TomvdPeet 908 41 5ms 3 Jan 2025 119th emplv 🇱🇻 908 41 5ms 3 Jan 2025 119th error256 908 41 4ms 5 Jan 2025 119th rucin93 🇵🇱 908 41 4ms 5 Jan 2025 119th alaaeelsayed 908 41 4ms 14 Jan 2025 119th KasperKivimaeki 🇫🇮 908 41 4ms 10 Dec 2025 126th Steffan153 🇫🇮 908 42 743ms 14 Feb 2026 126th GolfingSuccess 🇬🇷 908 42 740ms 15 Feb 2026 126th sean-niemann 🇺🇸 908 42 788ms 15 Feb 2026 126th xsot 🇸🇬 908 42 745ms 16 Feb 2026 130th emplv 🇱🇻 908 91 13ms 19 Jan 2025 131st pardouin 🇫🇷 905 56 401ms 5 Jan 2025 132nd JayXon 🇺🇸 904 79 417ms 28 Jul 2025 133rd JayXon 🇺🇸 901 56 1,446ms 28 Jul 2025 134th JayXon 🇺🇸 901 93 465ms 28 Jul 2025 134th nwellnhof 🇩🇪 901 93 443ms 6 Aug 2025 136th GrayJoKing 🇦🇺 899 38 28ms 22 Mar 2025 137th keegan-t 🇨🇦 899 63 11ms 20 Apr 2025 138th rucin93 🇵🇱 899 92 10ms 6 Jan 2025 138th sean-niemann 🇺🇸 899 92 11ms 5 Feb 2025 140th ovs-code 🇩🇪 898 40 32ms 4 Jan 2025 140th Frowny 898 40 33ms 26 Jan 2025 140th 2bular 898 40 32ms 15 Oct 2025 143rd nwellnhof 🇩🇪 898 55 280ms 6 Aug 2025 144th JayXon 🇺🇸 895 114 157ms 3 May 2025 144th acotis 895 114 166ms 21 Sep 2025 144th kumavale 895 114 168ms 24 Nov 2025 147th JayXon 🇺🇸 894 51 277ms 10 Jan 2025 148th Steffan153 🇫🇮 894 60 2,700ms 3 hours ago 148th JayXon 🇺🇸 894 60 3,093ms 117 mins ago 150th nwellnhof 🇩🇪 893 80 388ms 27 Jul 2025 151st JayXon 🇺🇸 893 94 391ms 1 Oct 2025 152nd canissimia 🇦🇶 892 84 166ms 5 Jan 2025 152nd ovs-code 🇩🇪 892 84 167ms 5 Jan 2025 152nd DialFrost 🇸🇬 892 84 175ms 5 Jan 2025 152nd Steffan153 🇫🇮 892 84 173ms 8 hours ago 156th nwellnhof 🇩🇪 888 123 294ms 28 Jul 2025 156th JayXon 🇺🇸 888 123 301ms 28 Jul 2025 156th Steffan153 🇫🇮 888 123 284ms 4 hours ago 159th JayXon 🇺🇸 887 95 3ms 9 Jan 2025 159th edsrzf 🇳🇿 887 95 2ms 9 Jan 2025 First Prev 81–160 of 1,050 Next Last