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 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 476th prestosilver 🇺🇸 808 41 35ms 18 Nov 2025 482nd Maznek 808 108 10ms 9 Jan 2025 483rd CLOStrophobic 🇮🇹 808 115 15ms 19 Jan 2025 483rd kg583 🇺🇸 808 115 17ms 24 Feb 2026 485th GolfingSuccess 🇬🇷 806 104 451ms 31 Jan 2026 486th JohandeRuiter 🇳🇱 805 83 4ms 21 Jan 2025 486th error256 805 83 4ms 25 Aug 2025 488th Yax42 🇫🇷 803 89 406ms 18 Feb 2026 489th kaascevich 803 114 103ms 29 Jul 2025 490th sean-niemann 🇺🇸 803 136 295ms 3 Jan 2025 491st Shanethegamer 🇺🇸 802 59 264ms 6 Jan 2025 492nd adriweb 🇫🇷 802 105 2ms 8 Jan 2025 492nd FlyingPenguin223 802 105 2ms 7 Mar 2025 492nd frosster 🇨🇦 802 105 3ms 6 Feb 2026 495th CatsAreFluffy 801 45 50ms 8 Jan 2025 496th kg583 🇺🇸 801 88 7ms 15 Feb 2026 497th MeWhenI 🇻🇦 801 98 29ms 25 Nov 2025 498th AlephSquirrel 801 116 16ms 5 Jan 2025 499th tatzyr 🇯🇵 800 63 2,138ms 29 Jul 2025 500th stefangimmillaro 800 105 374ms 7 Oct 2025 501st Andrey-Plotnikov 800 109 11ms 16 Jan 2025 501st acollett89 800 109 10ms 4 Aug 2025 501st snoozingnewt 🇨🇦 800 109 14ms 4 Nov 2025 501st olleicua 🇺🇸 800 109 9ms 9 Nov 2025 505th MeWhenI 🇻🇦 798 69 480ms 3 Jan 2025 505th roguh 🇬🇹 798 69 366ms 18 Jul 2025 507th inventshah 798 105 445ms 26 Mar 2025 507th Mukundan314 798 105 443ms 28 Apr 2025 509th ovs-code 🇩🇪 797 106 16ms 5 Jan 2025 510th DialFrost 🇸🇬 796 62 267ms 4 Jan 2025 510th bitsandbeyond 🇳🇱 796 62 331ms 3 Nov 2025 512th frankgraziano 795 82 11ms 9 Jul 2025 513th DialFrost 🇸🇬 795 106 2ms 2 Jan 2025 513th NickTheEASDude 🇺🇸 795 106 3ms 8 Jan 2025 515th edsrzf 🇳🇿 795 126 4ms 26 Aug 2025 516th BREMAUCY 🇫🇷 794 38 3ms 9 Jan 2025 517th snoozingnewt 🇨🇦 794 48 918ms 10 Dec 2025 517th error256 794 48 749ms 14 Feb 2026 519th retrohun 794 118 197ms 26 Jan 2025 520th jared-hughes 794 185 18ms 6 Apr 2025 521st j2e2 🇪🇸 789 107 15ms 7 Feb 2025 522nd alemelis 788 60 291ms 15 Jul 2025 523rd GrayJoKing 🇦🇺 788 117 11ms 25 Feb 2026 524th esmaycat 787 107 2ms 13 Jan 2025 525th edsrzf 🇳🇿 787 110 7ms 8 Jan 2025 526th edsrzf 🇳🇿 787 148 60ms 8 hours ago 527th inventshah 786 85 2ms 26 Mar 2025 527th TeodorDyakov 🇧🇬 786 85 2ms 27 Sep 2025 529th ShiraJoseph 🇺🇸 786 111 14ms 5 Jan 2025 530th sean-niemann 🇺🇸 785 107 446ms 29 Sep 2025 531st madex 🇩🇪 784 63 279ms 8 days ago 532nd rucin93 🇵🇱 780 83 152ms 6 Jan 2025 533rd zakariamouhid 779 112 11ms 8 Jan 2025 533rd gnlow 🇰🇷 779 112 11ms 11 Feb 2025 535th Steffan153 🇫🇮 779 114 27ms 6 hours ago 536th edsrzf 🇳🇿 778 100 117ms 25 Aug 2025 537th Mukundan314 777 86 2ms 28 Apr 2025 538th KatieLG 🇬🇧 776 71 477ms 7 Jan 2025 539th roguh 🇬🇹 776 84 27ms 9 Jul 2025 540th MeWhenI 🇻🇦 776 92 393ms 6 Jan 2025 541st tailorspy 776 108 448ms 10 Jan 2025 542nd MeWhenI 🇻🇦 776 129 5ms 6 Jan 2025 543rd IanUtley 775 109 16ms 6 Jan 2025 544th KatieLG 🇬🇧 774 39 3ms 7 Jan 2025 545th xsot 🇸🇬 774 91 5ms 23 Feb 2026 546th GolfingSuccess 🇬🇷 774 120 18ms 31 Jan 2026 547th KasperKivimaeki 🇫🇮 773 22 1,021ms 15 Aug 2025 548th SirBogman 🇺🇸 772 108 1,418ms 23 Jan 2025 549th CaedenHarper 🇨🇦 772 113 9ms 31 Aug 2025 550th ejini6969 770 43 38ms 14 Jun 2025 551st tatzyr 🇯🇵 769 191 15ms 6 Apr 2025 552nd AdrienHache 🇫🇷 768 93 427ms 6 Jan 2025 553rd ovs-code 🇩🇪 767 86 71ms 5 Jan 2025 553rd edsrzf 🇳🇿 767 86 69ms 12 Jul 2025 555th error256 767 133 154ms 3 May 2025 555th fantaize 767 133 158ms 14 days ago 557th Shanethegamer 🇺🇸 766 94 112ms 6 Jan 2025 558th DialFrost 🇸🇬 765 92 5ms 13 days ago 559th Yax42 🇫🇷 765 114 10ms 13 Nov 2025 560th error256 764 66 1,312ms 7 Jan 2025 First Prev 481–560 of 1,058 Next Last