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 637th galloj 🇨🇿 693 108 4ms 23 Jan 2025 637th edsrzf 🇳🇿 693 108 4ms 14 Mar 2025 637th stefangimmillaro 693 108 4ms 12 Jul 2025 637th iczelia 🇩🇪 693 108 4ms 21 Sep 2025 637th emgordon154 693 108 4ms 3 Nov 2025 646th albanian-laundromat 693 153 48ms 8 Sep 2025 647th edsrzf 🇳🇿 692 65 8ms 25 Aug 2025 648th Salutations45 692 126 11ms 5 Jan 2025 649th SirBogman 🇺🇸 690 143 144ms 3 Jun 2025 650th DialFrost 🇸🇬 689 92 104ms 30 Nov 2025 651st elgan65536 🇺🇸 689 148 161ms 16 Jan 2025 652nd iczelia 🇩🇪 688 151 133ms 21 Sep 2025 653rd pardouin 🇫🇷 687 78 2,567ms 4 Jan 2025 653rd stefangimmillaro 687 78 2,628ms 4 Jan 2025 653rd ScottHamper 687 78 2,580ms 19 Jan 2025 656th MeWhenI 🇻🇦 687 122 463ms 6 Jan 2025 657th charliegaming 687 127 10ms 24 Jan 2025 658th stefangimmillaro 685 144 46ms 14 Jan 2025 659th snoozingnewt 🇨🇦 682 93 110ms 26 Dec 2025 660th SirBogman 🇺🇸 681 98 4ms 16 Jan 2025 661st nullie 680 150 141ms 6 Apr 2025 662nd qbitYouri 679 124 2ms 4 Apr 2025 663rd snoozingnewt 🇨🇦 678 53 97ms 2 Nov 2025 664th 0xjac 🇨🇭 678 161 292ms 11 Jun 2025 665th gigaprofisi 🇺🇸 676 129 10ms 7 Aug 2025 666th Shanethegamer 🇺🇸 671 126 416ms 5 Jan 2025 667th BambooleanLogic 🇸🇪 671 130 12ms 17 Jul 2025 668th KasperKivimaeki 🇫🇮 671 152 177ms 3 May 2025 668th ian-h-chamberlain 🇺🇸 671 152 149ms 5 Jan 2026 670th MeWhenI 🇻🇦 670 93 229ms 7 Jan 2025 671st h3ra993huskp 🇯🇵 668 126 571ms 30 Nov 2025 672nd MeWhenI 🇻🇦 668 137 124ms 7 Jan 2025 673rd Ephellon 666 131 12ms 1 Feb 2025 674th j2e2 🇪🇸 665 106 5ms 9 Feb 2025 675th AlephSquirrel 665 111 3ms 21 Jan 2025 676th Herbert00709 🇵🇱 665 126 68ms 5 Jan 2025 677th fuzzylojik-golf 🇺🇸 662 32 63ms 10 Jul 2025 678th MeWhenI 🇻🇦 662 186 1,793ms 7 Nov 2025 679th MeWhenI 🇻🇦 661 101 4ms 6 Jan 2025 680th HumanoidCPU 661 132 10ms 7 Jan 2025 680th weliveinhell 🇭🇹 661 132 10ms 26 Jun 2025 682nd Shanethegamer 🇺🇸 660 100 70ms 7 Jan 2025 683rd Feniske 🇫🇷 658 75 326ms 14 Jan 2025 684th Yewzir 🇧🇪 658 166 344ms 6 Jan 2025 685th Natanaelel 🇸🇪 657 158 210ms 26 Apr 2025 686th emgordon154 655 188 1,655ms 11 Jun 2025 687th Mabeloid 🇳🇴 654 156 148ms 26 Oct 2025 688th snoozingnewt 🇨🇦 653 57 4ms 2 Nov 2025 689th snoozingnewt 🇨🇦 653 159 136ms 2 Nov 2025 690th LukeBridges 🇬🇧 651 134 11ms 8 Jan 2025 691st Shanethegamer 🇺🇸 650 110 420ms 6 Jan 2025 692nd luuumine 🇫🇷 648 103 4ms 8 Dec 2025 693rd Sciman101 648 130 2ms 26 Mar 2025 694th GolfingSuccess 🇬🇷 647 276 51ms 15 Feb 2026 695th error256 646 83 2,804ms 9 Jan 2025 696th tayloia 🇬🇧 646 135 13ms 12 Jan 2025 697th SirBogman 🇺🇸 645 277 51ms 21 Jan 2025 698th MeWhenI 🇻🇦 642 33 63ms 6 Jan 2025 699th Shanethegamer 🇺🇸 642 97 275ms 24 May 2025 700th DialFrost 🇸🇬 641 101 148ms 3 Jan 2025 701st KrausRaus 🇺🇸 641 136 11ms 3 Jan 2025 702nd ZakkkkAttackkkk 🇵🇭 639 102 17ms 6 Jan 2025 703rd arcpolaris 639 112 409ms 13 Jan 2026 704th HumanoidCPU 637 132 484ms 8 Nov 2025 705th Protothor 637 137 10ms 11 Jun 2025 706th The3gs 634 161 190ms 25 Jan 2025 707th OllieBoyne 🇬🇧 633 103 11ms 9 Jan 2025 708th MostParsingVex 633 159 27ms 6 Jan 2025 709th HahUK 631 173 291ms 10 Nov 2025 710th MeWhenI 🇻🇦 630 80 1,345ms 6 Jan 2025 711th kirjavascript 630 162 182ms 18 Mar 2025 712th BREMAUCY 🇫🇷 629 284 14ms 6 Aug 2025 713th CaedenHarper 🇨🇦 628 134 507ms 7 Oct 2025 713th kmathis22 628 134 578ms 31 Oct 2025 715th ikskuh 628 139 10ms 27 Jun 2025 715th alexsave 628 139 10ms 7 Oct 2025 717th KasperKivimaeki 🇫🇮 627 114 410ms 5 Jan 2025 718th Shanethegamer 🇺🇸 627 138 8ms 5 Jan 2025 719th grey0ut 625 79 323ms 9 Jan 2025 720th szymex73 🇵🇱 624 107 2ms 17 Jan 2025 First Prev 641–720 of 1,064 Next Last