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 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 480th Mukundan314 798 105 443ms 28 Apr 2025 482nd ovs-code 🇩🇪 797 106 16ms 5 Jan 2025 483rd DialFrost 🇸🇬 796 62 267ms 4 Jan 2025 483rd bitsandbeyond 🇳🇱 796 62 331ms 3 Nov 2025 485th DialFrost 🇸🇬 796 106 2ms 2 Jan 2025 485th NickTheEASDude 🇺🇸 796 106 3ms 8 Jan 2025 487th CarsonChr 🇺🇸 795 104 10ms 5 Jan 2025 487th m-tkach 🇺🇦 795 104 15ms 7 Jan 2025 487th jared-hughes 795 104 11ms 7 Jan 2025 487th Lv0Sys 🇵🇱 795 104 10ms 22 Feb 2026 491st BREMAUCY 🇫🇷 794 38 3ms 9 Jan 2025 492nd snoozingnewt 🇨🇦 794 48 918ms 10 Dec 2025 492nd error256 794 48 749ms 14 Feb 2026 494th JohandeRuiter 🇳🇱 794 83 4ms 21 Jan 2025 494th error256 794 83 4ms 25 Aug 2025 496th retrohun 794 118 197ms 26 Jan 2025 497th jared-hughes 794 185 18ms 6 Apr 2025 498th esmaycat 789 107 2ms 13 Jan 2025 498th j2e2 🇪🇸 789 107 15ms 7 Feb 2025 500th adamnielson42 🇺🇸 787 72 11ms 26 Jan 2025 500th paulofreitas 787 72 10ms 10 May 2025 500th jacekwladzinski 787 72 10ms 2 Oct 2025 500th solisolu 787 72 10ms 2 Nov 2025 500th NoneTheFewer 787 72 11ms 27 Dec 2025 500th theunofficialcoder 787 72 10ms 27 Dec 2025 500th SectorCorruptor 787 72 11ms 3 Feb 2026 507th edsrzf 🇳🇿 787 110 7ms 8 Jan 2025 507th dokutan 787 110 27ms 23 Feb 2025 509th edsrzf 🇳🇿 787 148 60ms 35 hours ago 510th sean-niemann 🇺🇸 786 107 446ms 29 Sep 2025 511th madex 🇩🇪 784 63 279ms 9 days ago 512th rucin93 🇵🇱 781 89 148ms 7 Dec 2025 512th sean-niemann 🇺🇸 781 89 164ms 7 Dec 2025 514th rucin93 🇵🇱 780 83 152ms 6 Jan 2025 515th voytxt 🇨🇿 780 106 11ms 4 Jan 2025 515th targrik 780 106 11ms 4 Apr 2025 517th MeWhenI 🇻🇦 780 129 5ms 6 Jan 2025 518th Steffan153 🇫🇮 779 114 27ms 33 hours ago 519th MeWhenI 🇻🇦 777 92 393ms 6 Jan 2025 520th edsrzf 🇳🇿 777 100 117ms 25 Aug 2025 521st helbling 🇨🇭 776 73 10ms 4 Jan 2025 522nd tailorspy 776 108 448ms 10 Jan 2025 523rd inventshah 775 85 2ms 26 Mar 2025 523rd TeodorDyakov 🇧🇬 775 85 2ms 27 Sep 2025 525th IanUtley 775 109 16ms 6 Jan 2025 526th KatieLG 🇬🇧 774 39 3ms 7 Jan 2025 527th xsot 🇸🇬 774 91 5ms 23 Feb 2026 528th GolfingSuccess 🇬🇷 774 120 18ms 31 Jan 2026 529th KasperKivimaeki 🇫🇮 773 22 1,021ms 15 Aug 2025 530th charliegaming 773 107 11ms 24 Jan 2025 531st SirBogman 🇺🇸 772 108 1,418ms 23 Jan 2025 532nd ejini6969 770 43 38ms 14 Jun 2025 533rd AdrienHache 🇫🇷 769 93 427ms 6 Jan 2025 534th tatzyr 🇯🇵 769 191 15ms 6 Apr 2025 535th ovs-code 🇩🇪 768 66 433ms 3 Jan 2025 535th AlephSquirrel 768 66 463ms 5 Jan 2025 535th duckyluuk 🇳🇱 768 66 394ms 9 Jul 2025 535th TheZwierzLF 🇵🇱 768 66 465ms 24 Nov 2025 539th error256 768 133 154ms 3 May 2025 539th fantaize 768 133 158ms 15 days ago 541st kurkale6ka 766 74 12ms 15 Dec 2025 542nd Mukundan314 766 86 2ms 28 Apr 2025 543rd Shanethegamer 🇺🇸 766 94 112ms 6 Jan 2025 544th DialFrost 🇸🇬 765 92 5ms 14 days ago 545th Maznek 765 108 11ms 9 Jan 2025 546th namelessiw 765 110 405ms 3 Oct 2025 546th MeWhenI 🇻🇦 765 110 581ms 7 Nov 2025 548th error256 764 66 1,312ms 7 Jan 2025 549th sean-niemann 🇺🇸 762 85 150ms 21 Oct 2025 550th Shanethegamer 🇺🇸 761 59 264ms 6 Jan 2025 551st kg583 🇺🇸 761 153 81ms 2 days ago 552nd stefangimmillaro 759 45 17ms 6 Jan 2025 553rd edsrzf 🇳🇿 758 95 99ms 1 Feb 2026 554th HumanoidCPU 758 109 11ms 7 Jan 2025 554th Andrey-Plotnikov 758 109 12ms 16 Jan 2025 554th acollett89 758 109 11ms 4 Aug 2025 554th snoozingnewt 🇨🇦 758 109 12ms 4 Nov 2025 554th olleicua 🇺🇸 758 109 10ms 9 Nov 2025 559th edsrzf 🇳🇿 758 111 11ms 25 Feb 2026 560th edsrzf 🇳🇿 757 28 59ms 2 Nov 2025 First Prev 481–560 of 1,065 Next Last