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 401st JayXon 🇺🇸 838 147 1,675ms 15 Sep 2025 402nd DialFrost 🇸🇬 835 43 100ms 7 Jan 2025 402nd SirBogman 🇺🇸 835 43 98ms 10 Jan 2025 402nd nwellnhof 🇩🇪 835 43 97ms 14 Jan 2025 402nd GrayJoKing 🇦🇺 835 43 106ms 17 Nov 2025 402nd edsrzf 🇳🇿 835 43 105ms 10 Jan 2026 402nd denkyuu1 835 43 89ms 23 Feb 2026 408th ovs-code 🇩🇪 835 66 433ms 3 Jan 2025 408th AlephSquirrel 835 66 463ms 5 Jan 2025 408th CaedenHarper 🇨🇦 835 66 422ms 19 Jan 2025 408th emgordon154 835 66 374ms 14 Apr 2025 408th fuzzylojik-golf 🇺🇸 835 66 437ms 7 Jul 2025 408th duckyluuk 🇳🇱 835 66 394ms 9 Jul 2025 408th b-illy 🇬🇧 835 66 497ms 13 Jul 2025 408th CornerMercury 🇬🇧 835 66 378ms 12 Oct 2025 408th Babafaba 835 66 446ms 30 Oct 2025 417th MeWhenI 🇻🇦 835 77 58ms 6 Jan 2025 418th pcrav0 835 78 11ms 29 Jan 2025 418th ehulinsky 🇺🇸 835 78 11ms 29 Mar 2025 420th saito-ta 🇯🇵 835 80 4ms 13 Jan 2025 420th GolfingSuccess 🇬🇷 835 80 2ms 24 days ago 422nd sean-niemann 🇺🇸 835 127 42ms 4 Jan 2025 423rd GrayJoKing 🇦🇺 834 101 2ms 14 Jul 2025 424th m-tkach 🇺🇦 834 130 12ms 7 Jan 2025 425th MeWhenI 🇻🇦 833 41 19ms 5 Jan 2025 426th DialFrost 🇸🇬 833 55 74ms 1 Jan 2025 426th snoozingnewt 🇨🇦 833 55 74ms 11 Sep 2025 428th Steffan153 🇫🇮 832 140 94ms 24 hours ago 429th frankgraziano 831 215 3,677ms 11 Aug 2025 430th GolfingSuccess 🇬🇷 830 224 1,721ms 11 Jan 2026 431st DialFrost 🇸🇬 829 46 685ms 15 Feb 2026 432nd edsrzf 🇳🇿 829 89 8ms 14 Oct 2025 433rd DialFrost 🇸🇬 828 40 35ms 1 Jan 2025 433rd jmerle 🇳🇱 828 40 35ms 7 Jan 2025 433rd Andriamanitra 🇫🇮 828 40 36ms 12 Jan 2025 433rd frankgraziano 828 40 36ms 12 May 2025 433rd Just4FunCoder 828 40 33ms 14 Sep 2025 433rd albanian-laundromat 828 40 33ms 30 Oct 2025 439th iczelia 🇩🇪 827 45 4ms 21 Sep 2025 440th edsrzf 🇳🇿 827 61 1,312ms 20 Jul 2025 441st primo-ppcg 🇹🇭 827 216 3,737ms 13 Aug 2025 442nd yhm138 825 79 10ms 16 Feb 2025 443rd m-tkach 🇺🇦 825 81 2ms 7 Jan 2025 443rd rhdqor213 825 81 2ms 9 Dec 2025 445th error256 825 122 25ms 8 Jan 2025 446th zacjl 824 105 15ms 8 Jan 2025 447th kg583 🇺🇸 824 144 40ms 20 Dec 2025 448th DialFrost 🇸🇬 823 67 476ms 1 Jan 2025 448th m-tkach 🇺🇦 823 67 428ms 23 Jul 2025 448th FEZfan 🇦🇺 823 67 428ms 1 Nov 2025 451st voytxt 🇨🇿 823 106 11ms 4 Jan 2025 451st targrik 823 106 11ms 4 Apr 2025 453rd stefangimmillaro 822 87 412ms 14 Jan 2025 453rd SirBogman 🇺🇸 822 87 428ms 23 Jan 2025 453rd tomtheisen 🇺🇸 822 87 409ms 15 Feb 2025 453rd namelessiw 822 87 394ms 24 Jul 2025 457th m-tkach 🇺🇦 822 102 467ms 7 Jan 2025 458th ovs-code 🇩🇪 820 79 179ms 17 Apr 2025 459th GrayJoKing 🇦🇺 818 96 35ms 25 Nov 2025 460th edsrzf 🇳🇿 818 145 44ms 20 Jul 2025 461st Natanaelel 🇸🇪 816 44 103ms 13 Jan 2025 462nd kg583 🇺🇸 816 106 26ms 13 days ago 463rd saito-ta 🇯🇵 815 26 56ms 12 Jan 2025 464th DialFrost 🇸🇬 815 87 440ms 1 Jan 2025 464th edsrzf 🇳🇿 815 87 482ms 2 Nov 2025 466th rucin93 🇵🇱 815 89 159ms 7 Dec 2025 466th sean-niemann 🇺🇸 815 89 164ms 7 Dec 2025 468th JOrE20 815 107 13ms 26 days ago 469th saito-ta 🇯🇵 815 115 20ms 12 Jan 2025 470th GolfingSuccess 🇬🇷 813 26 3ms 20 Mar 2025 471st stefangimmillaro 813 62 1,282ms 4 Jan 2025 472nd edsrzf 🇳🇿 812 66 2,660ms 2 Nov 2025 473rd Shanethegamer 🇺🇸 811 68 386ms 2 Jan 2025 473rd dokutan 811 68 397ms 6 Jan 2025 473rd HumanoidCPU 811 68 408ms 7 Jan 2025 473rd SirBogman 🇺🇸 811 68 545ms 15 Jan 2025 473rd albanian-laundromat 811 68 407ms 4 Aug 2025 473rd TheZwierzLF 🇵🇱 811 68 470ms 22 Nov 2025 473rd Yewzir 🇧🇪 811 68 377ms 1 Dec 2025 473rd snoozingnewt 🇨🇦 811 68 384ms 20 Feb 2026 First Prev 401–480 of 1,069 Next Last