The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 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 479th HumanoidCPU 811 68 408ms 7 Jan 2025 479th SirBogman 🇺🇸 811 68 545ms 15 Jan 2025 479th albanian-laundromat 811 68 407ms 4 Aug 2025 479th TheZwierzLF 🇵🇱 811 68 470ms 22 Nov 2025 479th Yewzir 🇧🇪 811 68 377ms 1 Dec 2025 479th snoozingnewt 🇨🇦 811 68 384ms 20 Feb 2026 487th stefangimmillaro 811 126 177ms 14 Jan 2025 488th SirBogman 🇺🇸 809 61 312ms 9 Jan 2025 489th stefangimmillaro 809 135 275ms 2 Jan 2025 490th aksyristos 808 41 36ms 7 Jan 2025 490th CornerMercury 🇬🇧 808 41 36ms 17 Jan 2025 490th HumanoidCPU 808 41 37ms 1 Feb 2025 490th dokutan 808 41 37ms 4 Feb 2025 490th CaedenHarper 🇨🇦 808 41 36ms 7 Sep 2025 490th prestosilver 🇺🇸 808 41 35ms 18 Nov 2025 496th Maznek 808 108 11ms 9 Jan 2025 497th CLOStrophobic 🇮🇹 808 115 15ms 19 Jan 2025 497th kg583 🇺🇸 808 115 17ms 24 Feb 2026 499th GolfingSuccess 🇬🇷 806 104 451ms 31 Jan 2026 500th JohandeRuiter 🇳🇱 805 83 4ms 21 Jan 2025 500th error256 805 83 4ms 25 Aug 2025 502nd Yax42 🇫🇷 804 89 406ms 18 Feb 2026 503rd adriweb 🇫🇷 804 105 2ms 8 Jan 2025 503rd FlyingPenguin223 804 105 2ms 7 Mar 2025 503rd frosster 🇨🇦 804 105 3ms 6 Feb 2026 506th kaascevich 803 114 145ms 29 Jul 2025 507th sean-niemann 🇺🇸 803 136 295ms 3 Jan 2025 508th CatsAreFluffy 801 45 50ms 8 Jan 2025 509th kg583 🇺🇸 801 88 7ms 15 Feb 2026 510th MeWhenI 🇻🇦 801 98 29ms 25 Nov 2025 511th stefangimmillaro 801 105 374ms 7 Oct 2025 512th AlephSquirrel 801 116 16ms 5 Jan 2025 513th tatzyr 🇯🇵 800 63 2,138ms 29 Jul 2025 514th Andrey-Plotnikov 800 109 12ms 16 Jan 2025 514th acollett89 800 109 11ms 4 Aug 2025 514th snoozingnewt 🇨🇦 800 109 12ms 4 Nov 2025 514th olleicua 🇺🇸 800 109 10ms 9 Nov 2025 518th MeWhenI 🇻🇦 799 69 480ms 3 Jan 2025 518th roguh 🇬🇹 799 69 366ms 18 Jul 2025 520th edsrzf 🇳🇿 799 126 4ms 26 Aug 2025 521st inventshah 798 105 445ms 26 Mar 2025 521st Mukundan314 798 105 443ms 28 Apr 2025 523rd ovs-code 🇩🇪 797 106 16ms 5 Jan 2025 524th DialFrost 🇸🇬 796 62 267ms 4 Jan 2025 524th bitsandbeyond 🇳🇱 796 62 331ms 3 Nov 2025 526th DialFrost 🇸🇬 796 106 2ms 2 Jan 2025 526th NickTheEASDude 🇺🇸 796 106 3ms 8 Jan 2025 528th frankgraziano 795 82 11ms 9 Jul 2025 529th BREMAUCY 🇫🇷 794 38 3ms 9 Jan 2025 530th snoozingnewt 🇨🇦 794 48 918ms 10 Dec 2025 530th error256 794 48 749ms 14 Feb 2026 532nd retrohun 794 118 197ms 26 Jan 2025 533rd jared-hughes 794 185 18ms 6 Apr 2025 534th edsrzf 🇳🇿 793 148 60ms 4 days ago 535th Shanethegamer 🇺🇸 790 59 264ms 6 Jan 2025 536th esmaycat 789 107 2ms 13 Jan 2025 536th j2e2 🇪🇸 789 107 15ms 7 Feb 2025 538th edsrzf 🇳🇿 787 110 7ms 8 Jan 2025 539th inventshah 786 85 2ms 26 Mar 2025 539th TeodorDyakov 🇧🇬 786 85 2ms 27 Sep 2025 541st sean-niemann 🇺🇸 786 107 446ms 29 Sep 2025 542nd ShiraJoseph 🇺🇸 786 111 10ms 5 Jan 2025 543rd madex 🇩🇪 784 63 279ms 12 days ago 544th rucin93 🇵🇱 781 89 148ms 7 Dec 2025 544th sean-niemann 🇺🇸 781 89 164ms 7 Dec 2025 546th rucin93 🇵🇱 780 83 152ms 6 Jan 2025 547th MeWhenI 🇻🇦 780 129 5ms 6 Jan 2025 548th zakariamouhid 779 112 11ms 8 Jan 2025 548th gnlow 🇰🇷 779 112 11ms 11 Feb 2025 550th Steffan153 🇫🇮 779 114 26ms 4 days ago 551st Mukundan314 777 86 2ms 28 Apr 2025 552nd MeWhenI 🇻🇦 777 92 393ms 6 Jan 2025 553rd edsrzf 🇳🇿 777 100 117ms 25 Aug 2025 554th alemelis 776 60 291ms 15 Jul 2025 555th KatieLG 🇬🇧 776 71 477ms 7 Jan 2025 556th roguh 🇬🇹 776 84 27ms 9 Jul 2025 557th tailorspy 776 108 448ms 10 Jan 2025 558th IanUtley 775 109 16ms 6 Jan 2025 559th KatieLG 🇬🇧 774 39 3ms 7 Jan 2025 560th xsot 🇸🇬 774 91 5ms 23 Feb 2026 First Prev 481–560 of 1,078 Next Last