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 241st error256 852 97 11ms 9 Jan 2025 241st nwellnhof 🇩🇪 852 97 11ms 27 Jul 2025 241st JOrE20 852 97 11ms 26 days ago 244th ovs-code 🇩🇪 851 84 402ms 6 Jan 2025 245th janAkali 🇷🇺 850 20 1,022ms 5 May 2025 245th snoozingnewt 🇨🇦 850 20 1,021ms 4 Dec 2025 247th MeWhenI 🇻🇦 849 39 36ms 3 Jan 2025 247th m-tkach 🇺🇦 849 39 37ms 6 Jan 2025 247th KatieLG 🇬🇧 849 39 33ms 7 Jan 2025 247th BREMAUCY 🇫🇷 849 39 36ms 6 Aug 2025 251st edsrzf 🇳🇿 849 83 31ms 30 Nov 2025 252nd ovs-code 🇩🇪 848 25 62ms 5 Jan 2025 253rd canissimia 🇦🇶 848 83 10ms 14 days ago 254th JayXon 🇺🇸 848 118 5ms 11 Jan 2025 255th edsrzf 🇳🇿 847 45 739ms 14 Feb 2026 255th albanian-laundromat 847 45 827ms 17 Feb 2026 255th CaedenHarper 🇨🇦 847 45 722ms 17 Feb 2026 258th error256 847 85 129ms 9 Jan 2025 258th edsrzf 🇳🇿 847 85 15ms 26 Dec 2025 260th Steffan153 🇫🇮 847 99 425ms 23 hours ago 261st HumanoidCPU 846 44 4ms 1 Feb 2025 261st plcc0 846 44 5ms 9 Apr 2025 263rd m-tkach 🇺🇦 846 105 31ms 9 Feb 2026 264th antimon2 🇯🇵 845 54 267ms 6 Jan 2025 265th Yewzir 🇧🇪 845 60 386ms 2 Jan 2025 265th DialFrost 🇸🇬 845 60 425ms 5 Jan 2025 265th HumanoidCPU 845 60 404ms 7 Jan 2025 265th commandz0 🇺🇸 845 60 439ms 1 Sep 2025 265th snoozingnewt 🇨🇦 845 60 360ms 15 Oct 2025 270th edsrzf 🇳🇿 845 75 105ms 1 Dec 2025 271st Steffan153 🇫🇮 845 78 2ms 24 hours ago 272nd edsrzf 🇳🇿 845 110 17ms 9 Jul 2025 273rd frankgraziano 845 111 2,342ms 13 Feb 2026 274th Steffan153 🇫🇮 844 92 101ms 16 mins ago 275th GolfingSuccess 🇬🇷 844 93 25ms 24 days ago 276th primo-ppcg 🇹🇭 843 117 42ms 27 Apr 2025 277th edsrzf 🇳🇿 843 121 167ms 28 Jan 2026 278th JayXon 🇺🇸 842 99 1,307ms 10 Jan 2025 279th Shanethegamer 🇺🇸 842 100 2ms 5 Jan 2025 279th Waffle3z 842 100 2ms 7 Jan 2025 281st ovs-code 🇩🇪 840 60 1,370ms 5 Jan 2025 282nd edsrzf 🇳🇿 840 130 307ms 25 Aug 2025 282nd GolfingSuccess 🇬🇷 840 130 288ms 31 Jan 2026 284th Shanethegamer 🇺🇸 838 36 3ms 4 Jan 2025 285th snyderek 🇺🇸 838 100 61ms 7 Jan 2025 286th JayXon 🇺🇸 838 147 1,675ms 15 Sep 2025 287th DialFrost 🇸🇬 835 43 100ms 7 Jan 2025 287th SirBogman 🇺🇸 835 43 98ms 10 Jan 2025 287th nwellnhof 🇩🇪 835 43 97ms 14 Jan 2025 287th GrayJoKing 🇦🇺 835 43 106ms 17 Nov 2025 287th edsrzf 🇳🇿 835 43 105ms 10 Jan 2026 287th denkyuu1 835 43 89ms 23 Feb 2026 293rd MeWhenI 🇻🇦 835 77 58ms 6 Jan 2025 294th JayXon 🇺🇸 835 93 119ms 8 Jan 2025 295th vlpx 🇫🇮 835 99 11ms 6 Jan 2025 296th sean-niemann 🇺🇸 835 127 42ms 4 Jan 2025 297th ovs-code 🇩🇪 834 79 4ms 5 Jan 2025 298th GrayJoKing 🇦🇺 834 101 2ms 14 Jul 2025 299th m-tkach 🇺🇦 834 130 12ms 7 Jan 2025 300th MeWhenI 🇻🇦 833 41 19ms 5 Jan 2025 301st DialFrost 🇸🇬 833 55 74ms 1 Jan 2025 301st snoozingnewt 🇨🇦 833 55 74ms 11 Sep 2025 303rd ovs-code 🇩🇪 833 68 11ms 5 Jan 2025 303rd Bulmenisaurus 833 68 11ms 5 Jan 2025 303rd zacjl 833 68 12ms 5 Jan 2025 303rd HPWiz 🇳🇿 833 68 12ms 5 Jan 2025 303rd AlephSquirrel 833 68 10ms 5 Jan 2025 303rd fourth-bit 833 68 10ms 6 Jan 2025 303rd lynn 833 68 10ms 6 Jan 2025 303rd xnor-gate 833 68 12ms 8 Jan 2025 303rd Powerroff 833 68 11ms 9 Jan 2025 303rd esmaycat 833 68 12ms 13 Jan 2025 303rd lambda-abstraction 833 68 10ms 15 Jan 2025 303rd firegene 🇮🇪 833 68 10ms 15 Jan 2025 303rd FieryIceStickie 833 68 11ms 17 Jan 2025 303rd CLOStrophobic 🇮🇹 833 68 10ms 20 Jan 2025 303rd bzijlema 🇳🇱 833 68 11ms 22 Jan 2025 303rd prplz 🇦🇺 833 68 11ms 4 Feb 2025 303rd error256 833 68 11ms 17 Apr 2025 303rd 4atj 833 68 10ms 9 Jul 2025 First Prev 241–320 of 1,056 Next Last