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 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 721st MostParsingVex 633 159 27ms 6 Jan 2025 722nd kirjavascript 631 162 180ms 18 Mar 2025 723rd HahUK 631 173 291ms 10 Nov 2025 724th MeWhenI 🇻🇦 630 80 1,345ms 6 Jan 2025 725th BREMAUCY 🇫🇷 629 284 14ms 6 Aug 2025 726th CaedenHarper 🇨🇦 628 134 507ms 7 Oct 2025 726th kmathis22 628 134 578ms 31 Oct 2025 728th ikskuh 628 139 10ms 27 Jun 2025 728th alexsave 628 139 10ms 7 Oct 2025 730th KasperKivimaeki 🇫🇮 627 114 410ms 5 Jan 2025 731st Shanethegamer 🇺🇸 627 138 8ms 5 Jan 2025 732nd grey0ut 625 79 323ms 9 Jan 2025 733rd szymex73 🇵🇱 624 107 2ms 17 Jan 2025 733rd Efgeen 🇸🇪 624 107 4ms 17 Nov 2025 735th DialFrost 🇸🇬 623 135 385ms 24 Sep 2025 736th two-bad 🇬🇧 623 140 11ms 22 Feb 2025 737th Shanethegamer 🇺🇸 622 114 470ms 6 Jan 2025 738th the-zammers 622 167 152ms 2 Feb 2025 739th Mabeloid 🇳🇴 621 105 11ms 7 Jan 2025 740th Mandrzejy 🇵🇱 621 135 460ms 5 Jan 2025 741st jerrandolph 621 176 276ms 23 Sep 2025 742nd MostParsingVex 619 100 201ms 7 Jan 2025 743rd firewoods1978 618 108 1ms 9 Jan 2025 743rd Maashau 618 108 5ms 29 Nov 2025 745th tomh1012 617 116 535ms 24 days ago 746th pardouin 🇫🇷 613 161 90ms 25 Apr 2025 747th dokutan 611 151 4ms 29 Apr 2025 748th HaxSam 610 143 11ms 27 Jun 2025 749th tatzyr 🇯🇵 609 81 274ms 5 Mar 2025 750th jared-hughes 609 107 16ms 7 Jan 2025 751st edsrzf 🇳🇿 609 178 388ms 2 Mar 2025 752nd Herbert00709 🇵🇱 607 110 5ms 5 Jan 2025 753rd bac0id 607 138 447ms 10 Jan 2025 754th snoozingnewt 🇨🇦 606 118 438ms 2 Nov 2025 755th dokutan 606 166 3ms 4 Feb 2025 756th Jacob385 605 139 363ms 28 Oct 2025 757th emgordon154 605 143 34ms 3 Jan 2025 758th MostParsingVex 603 153 14ms 5 Jan 2025 759th snoozingnewt 🇨🇦 603 181 297ms 2 Nov 2025 760th juliansiebert 🇩🇪 602 82 306ms 1 Mar 2025 761st c0d3-4-F00d 🇩🇪 602 111 2ms 9 Jan 2025 761st wansacis 🇩🇪 602 111 2ms 30 Jan 2025 761st prestosilver 🇺🇸 602 111 2ms 18 Nov 2025 764th aksyristos 602 145 11ms 11 Jan 2025 765th Shanethegamer 🇺🇸 600 108 150ms 8 Jan 2025 765th pardouin 🇫🇷 600 108 150ms 29 Jul 2025 767th prestosilver 🇺🇸 599 136 373ms 18 Dec 2025 768th luuumine 🇫🇷 599 140 65ms 8 Dec 2025 769th denballakh 598 109 16ms 13 Jan 2025 770th Maximizer02 597 145 11ms 10 Jan 2025 771st dbut2 🇦🇺 597 183 283ms 14 Jan 2025 772nd madex 🇩🇪 596 112 2ms 4 Jan 2025 772nd Mandrzejy 🇵🇱 596 112 1ms 5 Jan 2025 774th msbranicky 596 169 5ms 1 Jun 2025 775th sean-niemann 🇺🇸 594 109 170ms 22 Oct 2025 776th xyangst 593 147 10ms 14 Feb 2025 777th FlorianCassayre 🇫🇷 592 110 11ms 14 Jan 2025 777th wobblybits 592 110 17ms 19 Aug 2025 779th Yewzir 🇧🇪 592 208 1,807ms 14 Nov 2025 780th iczelia 🇩🇪 591 61 52ms 21 Sep 2025 781st Jay2k1 591 63 4ms 6 Nov 2025 782nd matricronia 591 113 2ms 1 Feb 2026 783rd denkyuu1 590 79 4,829ms 12 days ago 784th Yewzir 🇧🇪 590 142 476ms 6 Jan 2025 785th GolfingSuccess 🇬🇷 589 118 31ms 2 Jan 2025 785th edsrzf 🇳🇿 589 118 10ms 25 Aug 2025 787th dokutan 589 147 27ms 20 Feb 2025 788th ikskuh 589 209 1,658ms 27 Jun 2025 789th snoozingnewt 🇨🇦 588 143 738ms 2 Nov 2025 790th nemoyatpeace 587 111 10ms 18 Jan 2026 791st emgordon154 587 120 7ms 12 Jan 2025 792nd Shanethegamer 🇺🇸 587 177 138ms 3 Jan 2025 792nd WatMan77 587 177 132ms 27 May 2025 794th martindotexe 🇳🇴 587 186 274ms 16 May 2025 795th gastropner 586 114 2ms 5 Jul 2025 795th jupj 🇫🇮 586 114 2ms 27 Aug 2025 797th Shanethegamer 🇺🇸 583 143 1,318ms 4 Jan 2025 798th 051 🇸🇬 582 112 11ms 8 Oct 2025 799th emgordon154 580 87 1,233ms 5 Jan 2025 800th mousetail 🇳🇱 579 59 24ms 6 Feb 2025 First Prev 721–800 of 1,078 Next Last