The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 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 561st edsrzf 🇳🇿 758 111 11ms 25 Feb 2026 562nd edsrzf 🇳🇿 757 28 59ms 2 Nov 2025 563rd FEZfan 🇦🇺 757 67 428ms 9 Jul 2025 563rd m-tkach 🇺🇦 757 67 428ms 23 Jul 2025 565th DialFrost 🇸🇬 756 124 2,650ms 12 Jan 2025 566th Shanethegamer 🇺🇸 756 246 1,451ms 14 Apr 2025 567th snoozingnewt 🇨🇦 755 40 2ms 2 Nov 2025 568th andrewl64 755 75 11ms 25 Sep 2025 569th MostParsingVex 755 111 477ms 7 Jan 2025 570th error256 754 94 471ms 15 Feb 2026 571st ovs-code 🇩🇪 753 86 71ms 5 Jan 2025 571st edsrzf 🇳🇿 753 86 69ms 12 Jul 2025 573rd UnderKoen 🇳🇱 753 144 13ms 21 May 2025 574th alemelis 748 60 291ms 15 Jul 2025 575th GolfingSuccess 🇬🇷 748 157 176ms 8 days ago 576th Vexxter9 🇳🇱 747 113 2ms 14 Jan 2025 577th Shanethegamer 🇺🇸 746 68 386ms 2 Jan 2025 577th SirBogman 🇺🇸 746 68 545ms 15 Jan 2025 579th denkyuu1 745 50 5ms 22 days ago 580th pcrav0 745 76 18ms 29 Jan 2025 580th ZakkkkAttackkkk 🇵🇭 745 76 19ms 5 Feb 2025 580th evan18c 745 76 10ms 17 Apr 2025 583rd ShiraJoseph 🇺🇸 745 111 10ms 5 Jan 2025 584th error256 744 113 489ms 24 Sep 2025 585th error256 744 250 1,426ms 27 Jul 2025 586th kkoenig 743 147 297ms 7 Sep 2025 587th anter69 🇭🇺 742 68 1,293ms 13 Mar 2025 588th qwertyuiop3 🇷🇺 742 113 455ms 15 May 2025 589th rucin93 🇵🇱 740 89 2ms 2 Jan 2025 589th Alex-x90 🇺🇸 740 89 4ms 4 Jan 2025 591st stefangimmillaro 740 105 113ms 3 Jan 2025 592nd zakariamouhid 738 112 11ms 8 Jan 2025 592nd gnlow 🇰🇷 738 112 11ms 11 Feb 2025 594th snoozingnewt 🇨🇦 738 124 103ms 20 Nov 2025 595th emgordon154 738 252 1,492ms 15 Apr 2025 596th Shanethegamer 🇺🇸 737 94 112ms 6 Jan 2025 597th Just4FunCoder 736 77 11ms 24 Sep 2025 598th MeWhenI 🇻🇦 735 69 480ms 3 Jan 2025 598th roguh 🇬🇹 735 69 366ms 18 Jul 2025 600th SirBogman 🇺🇸 733 49 33ms 9 Jan 2025 601st CaedenHarper 🇨🇦 732 113 12ms 31 Aug 2025 602nd emgordon154 731 29 133ms 11 Sep 2025 603rd edsrzf 🇳🇿 729 95 99ms 1 Feb 2026 604th SirBogman 🇺🇸 729 115 63ms 16 Jan 2025 605th annaproxy 728 116 24ms 29 Aug 2025 606th duckyluuk 🇳🇱 727 108 41ms 4 Jan 2025 607th ehulinsky 🇺🇸 726 78 11ms 29 Mar 2025 608th Yax42 🇫🇷 725 114 13ms 13 Nov 2025 609th qwertyuiop3 🇷🇺 724 91 1ms 15 May 2025 610th CLOStrophobic 🇮🇹 721 144 136ms 28 May 2025 610th Andriamanitra 🇫🇮 721 144 149ms 7 Jun 2025 612th GrayJoKing 🇦🇺 719 117 11ms 25 Feb 2026 613th yhm138 717 79 10ms 16 Feb 2025 614th edsrzf 🇳🇿 717 124 27ms 2 Feb 2026 615th MostParsingVex 716 92 4ms 7 Jan 2025 615th Lv0Sys 🇵🇱 716 92 4ms 10 Dec 2025 617th j2e2 🇪🇸 716 103 4ms 6 Feb 2025 618th albanian-laundromat 714 141 4ms 5 Jul 2025 619th luuumine 🇫🇷 714 143 145ms 8 Dec 2025 620th MeWhenI 🇻🇦 714 153 285ms 7 Jan 2025 621st smclaughlin-cf 713 116 15ms 21 Feb 2025 622nd MeWhenI 🇻🇦 712 87 231ms 38 hours ago 623rd Kacarott 🇦🇺 711 91 68ms 6 Jan 2025 624th muser-logiccpu 🇺🇦 709 119 2ms 24 Jul 2025 625th CaedenHarper 🇨🇦 709 154 280ms 17 days ago 626th FlorianCassayre 🇫🇷 708 80 11ms 14 Jan 2025 627th Cube14yt 707 117 11ms 13 Nov 2025 628th DialFrost 🇸🇬 706 253 3,967ms 13 Aug 2025 629th emgordon154 705 145 158ms 14 Mar 2025 630th stackofbears 704 51 34ms 10 Jan 2025 631st SectorCorruptor 704 72 355ms 3 days ago 632nd ovs-code 🇩🇪 703 64 9ms 5 Jan 2025 633rd MarcMush 🇫🇷 701 64 311ms 29 Jan 2025 634th DialFrost 🇸🇬 701 94 4ms 3 Jan 2025 635th tobeannouncd 701 148 129ms 20 Jan 2025 636th imperfect-fourth 700 156 278ms 15 days ago 637th CLOStrophobic 🇮🇹 700 158 41ms 13 Feb 2025 638th stefangimmillaro 699 131 262ms 3 Jan 2025 639th fuzzylojik-golf 🇺🇸 694 103 374ms 23 May 2025 640th j2e2 🇪🇸 693 95 1ms 19 Feb 2025 First Prev 561–640 of 1,070 Next Last