The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 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 561st DialFrost 🇸🇬 756 124 2,650ms 12 Jan 2025 562nd Shanethegamer 🇺🇸 756 246 1,448ms 14 Apr 2025 563rd snoozingnewt 🇨🇦 754 40 2ms 2 Nov 2025 564th error256 754 94 471ms 15 Feb 2026 565th MostParsingVex 754 111 431ms 7 Jan 2025 566th UnderKoen 🇳🇱 753 144 13ms 21 May 2025 567th smclaughlin-cf 752 116 10ms 21 Feb 2025 568th CLOStrophobic 🇮🇹 751 158 41ms 13 Feb 2025 569th rucin93 🇵🇱 750 89 2ms 2 Jan 2025 569th Alex-x90 🇺🇸 750 89 4ms 4 Jan 2025 571st Cube14yt 746 117 10ms 13 Nov 2025 572nd denkyuu1 745 50 5ms 18 days ago 573rd Vexxter9 🇳🇱 745 113 2ms 14 Jan 2025 574th frankgraziano 744 124 13ms 24 Feb 2026 575th error256 744 250 1,416ms 27 Jul 2025 576th error256 743 113 489ms 24 Sep 2025 577th kkoenig 742 147 297ms 7 Sep 2025 578th stefangimmillaro 741 105 113ms 3 Jan 2025 579th qwertyuiop3 🇷🇺 741 113 464ms 15 May 2025 580th anter69 🇭🇺 740 68 1,293ms 13 Mar 2025 581st MarcMush 🇫🇷 739 64 311ms 29 Jan 2025 582nd snoozingnewt 🇨🇦 738 124 104ms 20 Nov 2025 583rd emgordon154 738 252 1,439ms 15 Apr 2025 584th qwertyuiop3 🇷🇺 734 91 1ms 15 May 2025 585th SirBogman 🇺🇸 733 49 33ms 9 Jan 2025 586th XenThe 🇬🇧 733 119 12ms 25 Nov 2025 587th emgordon154 731 29 133ms 11 Sep 2025 588th rucin93 🇵🇱 731 88 112ms 18 Feb 2025 589th SirBogman 🇺🇸 728 115 65ms 16 Jan 2025 590th duckyluuk 🇳🇱 727 108 41ms 4 Jan 2025 591st MostParsingVex 726 92 4ms 7 Jan 2025 591st Lv0Sys 🇵🇱 726 92 4ms 10 Dec 2025 593rd Kacarott 🇦🇺 725 91 68ms 6 Jan 2025 594th CarsonChr 🇺🇸 721 121 10ms 5 Jan 2025 594th didion0 🇺🇸 721 121 12ms 24 Feb 2025 594th SebassNoob 721 121 11ms 8 Aug 2025 597th frankgraziano 721 128 6ms 23 Aug 2025 598th CLOStrophobic 🇮🇹 719 144 136ms 28 May 2025 598th Andriamanitra 🇫🇮 719 144 149ms 7 Jun 2025 600th DialFrost 🇸🇬 717 66 343ms 3 Jan 2025 601st edsrzf 🇳🇿 717 124 27ms 2 Feb 2026 602nd j2e2 🇪🇸 716 103 4ms 6 Feb 2025 603rd iliazeus 715 122 13ms 25 Nov 2025 604th luuumine 🇫🇷 713 143 146ms 8 Dec 2025 605th MeWhenI 🇻🇦 713 153 285ms 7 Jan 2025 606th DialFrost 🇸🇬 710 94 4ms 3 Jan 2025 607th albanian-laundromat 710 141 4ms 5 Jul 2025 608th helbling 🇨🇭 709 123 10ms 5 Jan 2025 609th muser-logiccpu 🇺🇦 708 119 2ms 24 Jul 2025 610th CaedenHarper 🇨🇦 708 154 280ms 13 days ago 611th DialFrost 🇸🇬 706 253 3,967ms 13 Aug 2025 612th stackofbears 704 51 34ms 10 Jan 2025 613th emgordon154 704 145 172ms 14 Mar 2025 614th j2e2 🇪🇸 703 95 1ms 19 Feb 2025 614th iczelia 🇩🇪 703 95 4ms 24 Sep 2025 616th DialFrost 🇸🇬 700 92 104ms 30 Nov 2025 617th tobeannouncd 700 148 129ms 20 Jan 2025 618th stefangimmillaro 699 131 159ms 3 Jan 2025 619th imperfect-fourth 699 156 278ms 11 days ago 620th stefangimmillaro 698 121 380ms 6 Jan 2025 621st pardouin 🇫🇷 697 78 2,728ms 4 Jan 2025 621st stefangimmillaro 697 78 2,628ms 4 Jan 2025 621st ScottHamper 697 78 2,580ms 19 Jan 2025 624th fuzzylojik-golf 🇺🇸 694 103 374ms 23 May 2025 625th dominikfhnw 693 52 51ms 30 Mar 2025 626th GolfingSuccess 🇬🇷 693 108 4ms 31 Dec 2024 626th Shanethegamer 🇺🇸 693 108 4ms 1 Jan 2025 626th helbling 🇨🇭 693 108 4ms 4 Jan 2025 626th dokutan 693 108 4ms 6 Jan 2025 626th galloj 🇨🇿 693 108 4ms 23 Jan 2025 626th edsrzf 🇳🇿 693 108 4ms 14 Mar 2025 626th stefangimmillaro 693 108 4ms 12 Jul 2025 626th iczelia 🇩🇪 693 108 4ms 21 Sep 2025 626th emgordon154 693 108 4ms 3 Nov 2025 635th albanian-laundromat 693 153 48ms 8 Sep 2025 636th snoozingnewt 🇨🇦 692 93 110ms 26 Dec 2025 637th Salutations45 692 126 10ms 5 Jan 2025 638th SirBogman 🇺🇸 690 143 144ms 3 Jun 2025 639th elgan65536 🇺🇸 689 148 161ms 16 Jan 2025 640th charliegaming 687 127 14ms 24 Jan 2025 First Prev 561–640 of 1,048 Next Last