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 chars. 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 Chars Time Submitted 641st elgan65536 🇺🇸 689 148 161ms 16 Jan 2025 642nd iczelia 🇩🇪 688 151 133ms 21 Sep 2025 643rd pardouin 🇫🇷 687 78 2,728ms 4 Jan 2025 643rd stefangimmillaro 687 78 2,628ms 4 Jan 2025 643rd ScottHamper 687 78 2,580ms 19 Jan 2025 646th MeWhenI 🇻🇦 687 122 463ms 6 Jan 2025 647th stefangimmillaro 685 144 46ms 14 Jan 2025 648th didion0 🇺🇸 683 121 12ms 24 Feb 2025 648th SebassNoob 683 121 11ms 8 Aug 2025 650th nullie 680 150 141ms 6 Apr 2025 651st qbitYouri 679 124 2ms 4 Apr 2025 652nd snoozingnewt 🇨🇦 678 53 97ms 2 Nov 2025 653rd iliazeus 678 122 13ms 25 Nov 2025 654th 0xjac 🇨🇭 678 161 292ms 11 Jun 2025 655th roguh 🇬🇹 674 84 27ms 9 Jul 2025 656th SirBogman 🇺🇸 672 98 4ms 16 Jan 2025 657th helbling 🇨🇭 672 123 10ms 5 Jan 2025 658th Shanethegamer 🇺🇸 671 126 416ms 5 Jan 2025 659th KasperKivimaeki 🇫🇮 671 152 177ms 3 May 2025 659th ian-h-chamberlain 🇺🇸 671 152 149ms 5 Jan 2026 661st MeWhenI 🇻🇦 670 93 229ms 7 Jan 2025 662nd MeWhenI 🇻🇦 668 137 124ms 7 Jan 2025 663rd SB-945 667 85 12ms 5 Jan 2025 663rd randolchance 667 85 24ms 20 May 2025 665th dokutan 667 108 3ms 26 Dec 2025 666th h3ra993huskp 🇯🇵 667 126 571ms 30 Nov 2025 667th j2e2 🇪🇸 665 106 5ms 9 Feb 2025 668th AlephSquirrel 665 111 3ms 21 Jan 2025 669th Herbert00709 🇵🇱 665 126 68ms 5 Jan 2025 670th fuzzylojik-golf 🇺🇸 662 32 63ms 10 Jul 2025 671st MeWhenI 🇻🇦 662 186 1,793ms 7 Nov 2025 672nd yzhs 🇩🇪 659 86 11ms 17 Jan 2025 673rd Feniske 🇫🇷 658 75 326ms 14 Jan 2025 674th Yewzir 🇧🇪 658 166 344ms 6 Jan 2025 675th Natanaelel 🇸🇪 657 158 210ms 26 Apr 2025 676th Salutations45 656 126 10ms 5 Jan 2025 677th emgordon154 655 188 1,655ms 11 Jun 2025 678th Mabeloid 🇳🇴 654 156 148ms 26 Oct 2025 679th snoozingnewt 🇨🇦 653 57 4ms 2 Nov 2025 680th snoozingnewt 🇨🇦 653 159 136ms 2 Nov 2025 681st MeWhenI 🇻🇦 652 101 4ms 6 Jan 2025 682nd Shanethegamer 🇺🇸 649 110 420ms 6 Jan 2025 683rd Sciman101 648 130 2ms 26 Mar 2025 684th GolfingSuccess 🇬🇷 647 276 51ms 15 Feb 2026 685th error256 646 83 2,804ms 9 Jan 2025 686th SirBogman 🇺🇸 645 277 51ms 21 Jan 2025 687th JunkIce 644 88 11ms 17 Jan 2025 688th Shanethegamer 🇺🇸 644 100 70ms 7 Jan 2025 689th MeWhenI 🇻🇦 642 33 63ms 6 Jan 2025 690th Shanethegamer 🇺🇸 642 97 275ms 24 May 2025 691st DialFrost 🇸🇬 641 101 148ms 3 Jan 2025 692nd gigaprofisi 🇺🇸 641 129 9ms 7 Aug 2025 693rd luuumine 🇫🇷 640 103 4ms 8 Dec 2025 694th arcpolaris 638 112 409ms 13 Jan 2026 695th BambooleanLogic 🇸🇪 636 130 9ms 17 Jul 2025 696th HumanoidCPU 636 132 484ms 8 Nov 2025 697th The3gs 634 161 190ms 25 Jan 2025 698th MostParsingVex 633 159 27ms 6 Jan 2025 699th Ephellon 631 131 10ms 1 Feb 2025 700th HahUK 631 173 291ms 10 Nov 2025 701st MeWhenI 🇻🇦 630 80 1,345ms 6 Jan 2025 702nd kirjavascript 630 162 182ms 18 Mar 2025 703rd BREMAUCY 🇫🇷 629 284 14ms 6 Aug 2025 704th KasperKivimaeki 🇫🇮 627 114 410ms 5 Jan 2025 705th CaedenHarper 🇨🇦 627 134 507ms 7 Oct 2025 705th kmathis22 627 134 578ms 31 Oct 2025 707th Shanethegamer 🇺🇸 627 138 8ms 5 Jan 2025 708th weliveinhell 🇭🇹 626 132 10ms 26 Jun 2025 709th grey0ut 625 79 323ms 9 Jan 2025 710th MostParsingVex 623 100 201ms 7 Jan 2025 711th Shanethegamer 🇺🇸 622 114 470ms 6 Jan 2025 712th DialFrost 🇸🇬 622 135 385ms 24 Sep 2025 713th the-zammers 622 167 152ms 2 Feb 2025 714th Mandrzejy 🇵🇱 621 135 460ms 5 Jan 2025 715th prestosilver 🇺🇸 621 136 373ms 18 Dec 2025 716th jerrandolph 621 176 276ms 23 Sep 2025 717th LukeBridges 🇬🇧 617 134 10ms 8 Jan 2025 718th szymex73 🇵🇱 616 107 2ms 17 Jan 2025 718th Efgeen 🇸🇪 616 107 4ms 17 Nov 2025 720th tomh1012 616 116 535ms 20 days ago First Prev 641–720 of 1,050 Next Last