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 481st stefangimmillaro 811 126 170ms 14 Jan 2025 482nd SirBogman 🇺🇸 809 61 312ms 9 Jan 2025 483rd stefangimmillaro 809 135 275ms 2 Jan 2025 484th aksyristos 808 41 36ms 7 Jan 2025 484th CornerMercury 🇬🇧 808 41 36ms 17 Jan 2025 484th HumanoidCPU 808 41 37ms 1 Feb 2025 484th dokutan 808 41 37ms 4 Feb 2025 484th CaedenHarper 🇨🇦 808 41 36ms 7 Sep 2025 484th prestosilver 🇺🇸 808 41 35ms 18 Nov 2025 490th Maznek 808 108 11ms 9 Jan 2025 491st CLOStrophobic 🇮🇹 808 115 15ms 19 Jan 2025 491st kg583 🇺🇸 808 115 17ms 24 Feb 2026 493rd GolfingSuccess 🇬🇷 806 104 451ms 31 Jan 2026 494th JohandeRuiter 🇳🇱 805 83 4ms 21 Jan 2025 494th error256 805 83 4ms 25 Aug 2025 496th Yax42 🇫🇷 804 89 406ms 18 Feb 2026 497th kaascevich 803 114 103ms 29 Jul 2025 498th sean-niemann 🇺🇸 803 136 295ms 3 Jan 2025 499th error256 802 79 108ms 5 hours ago 500th adriweb 🇫🇷 802 105 2ms 8 Jan 2025 500th FlyingPenguin223 802 105 2ms 7 Mar 2025 500th frosster 🇨🇦 802 105 3ms 6 Feb 2026 503rd CatsAreFluffy 801 45 50ms 8 Jan 2025 504th kg583 🇺🇸 801 88 7ms 15 Feb 2026 505th MeWhenI 🇻🇦 801 98 29ms 25 Nov 2025 506th stefangimmillaro 801 105 374ms 7 Oct 2025 507th AlephSquirrel 801 116 16ms 5 Jan 2025 508th tatzyr 🇯🇵 800 63 2,138ms 29 Jul 2025 509th Andrey-Plotnikov 800 109 12ms 16 Jan 2025 509th acollett89 800 109 11ms 4 Aug 2025 509th snoozingnewt 🇨🇦 800 109 12ms 4 Nov 2025 509th olleicua 🇺🇸 800 109 10ms 9 Nov 2025 513th MeWhenI 🇻🇦 799 69 480ms 3 Jan 2025 513th roguh 🇬🇹 799 69 366ms 18 Jul 2025 515th edsrzf 🇳🇿 799 126 4ms 26 Aug 2025 516th inventshah 798 105 445ms 26 Mar 2025 516th Mukundan314 798 105 443ms 28 Apr 2025 518th ovs-code 🇩🇪 797 106 16ms 5 Jan 2025 519th DialFrost 🇸🇬 796 62 267ms 4 Jan 2025 519th bitsandbeyond 🇳🇱 796 62 331ms 3 Nov 2025 521st frankgraziano 795 82 11ms 9 Jul 2025 522nd DialFrost 🇸🇬 795 106 2ms 2 Jan 2025 522nd NickTheEASDude 🇺🇸 795 106 3ms 8 Jan 2025 524th BREMAUCY 🇫🇷 794 38 3ms 9 Jan 2025 525th snoozingnewt 🇨🇦 794 48 918ms 10 Dec 2025 525th error256 794 48 749ms 14 Feb 2026 527th retrohun 794 118 197ms 26 Jan 2025 528th jared-hughes 794 185 18ms 6 Apr 2025 529th Shanethegamer 🇺🇸 790 59 264ms 6 Jan 2025 530th j2e2 🇪🇸 789 107 15ms 7 Feb 2025 531st esmaycat 787 107 2ms 13 Jan 2025 532nd edsrzf 🇳🇿 787 110 7ms 8 Jan 2025 533rd edsrzf 🇳🇿 787 148 60ms 29 hours ago 534th inventshah 786 85 2ms 26 Mar 2025 534th TeodorDyakov 🇧🇬 786 85 2ms 27 Sep 2025 536th sean-niemann 🇺🇸 786 107 446ms 29 Sep 2025 537th ShiraJoseph 🇺🇸 786 111 10ms 5 Jan 2025 538th madex 🇩🇪 784 63 279ms 9 days ago 539th rucin93 🇵🇱 780 83 152ms 6 Jan 2025 540th MeWhenI 🇻🇦 780 129 5ms 6 Jan 2025 541st zakariamouhid 779 112 11ms 8 Jan 2025 541st gnlow 🇰🇷 779 112 11ms 11 Feb 2025 543rd Steffan153 🇫🇮 779 114 27ms 27 hours ago 544th Mukundan314 777 86 2ms 28 Apr 2025 545th MeWhenI 🇻🇦 777 92 393ms 6 Jan 2025 546th edsrzf 🇳🇿 777 100 117ms 25 Aug 2025 547th alemelis 776 60 291ms 15 Jul 2025 548th KatieLG 🇬🇧 776 71 477ms 7 Jan 2025 549th roguh 🇬🇹 776 84 27ms 9 Jul 2025 550th tailorspy 776 108 448ms 10 Jan 2025 551st IanUtley 775 109 16ms 6 Jan 2025 552nd KatieLG 🇬🇧 774 39 3ms 7 Jan 2025 553rd xsot 🇸🇬 774 91 5ms 23 Feb 2026 554th GolfingSuccess 🇬🇷 774 120 18ms 31 Jan 2026 555th KasperKivimaeki 🇫🇮 773 22 1,021ms 15 Aug 2025 556th SirBogman 🇺🇸 772 108 1,418ms 23 Jan 2025 557th CaedenHarper 🇨🇦 772 113 12ms 31 Aug 2025 558th ejini6969 770 43 38ms 14 Jun 2025 559th AdrienHache 🇫🇷 769 93 427ms 6 Jan 2025 560th tatzyr 🇯🇵 769 191 15ms 6 Apr 2025 First Prev 481–560 of 1,069 Next Last