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 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 881st JOrE20 499 127 123ms 4 Dec 2025 882nd jtaxen 497 131 49ms 27 Jan 2025 883rd jameswmccarty 494 132 12ms 7 Mar 2025 884th aditsu 492 109 2,631ms 30 Nov 2025 885th amazingalek 🇳🇴 490 146 348ms 1 Jan 2026 886th HumanoidCPU 490 171 64ms 17 Jan 2025 887th DanielSchmerber 489 172 466ms 9 Jan 2025 888th snoozingnewt 🇨🇦 489 177 8ms 2 Nov 2025 889th JRaspass 🇬🇧 488 224 307ms 5 Jan 2025 890th codewrite 🇬🇧 487 147 517ms 6 Jan 2026 891st nils-imhoff 487 253 1,647ms 27 Jun 2025 892nd HumanoidCPU 484 138 2ms 25 May 2025 893rd Ailko 🇧🇪 483 135 29ms 17 Jan 2025 893rd itljan30 483 135 12ms 26 Jan 2025 893rd smilesformiles3 483 135 18ms 18 Jun 2025 896th gjoacorp 🇬🇧 482 174 447ms 4 Aug 2025 896th dokutan 482 174 64ms 13 Nov 2025 898th dokutan 480 139 5ms 13 Nov 2025 899th snoozingnewt 🇨🇦 480 192 9ms 2 Nov 2025 900th emgordon154 477 140 5ms 20 Dec 2025 901st bpharaldsson 477 150 472ms 31 Jan 2026 902nd snoozingnewt 🇨🇦 474 141 4ms 2 Nov 2025 903rd snoozingnewt 🇨🇦 474 196 32ms 2 Nov 2025 904th HumanoidCPU 473 95 6ms 1 Feb 2025 905th snoozingnewt 🇨🇦 473 188 27ms 2 Nov 2025 906th Pale-Vessel 473 216 199ms 23 Sep 2025 907th HumanoidCPU 472 179 373ms 2 Feb 2025 908th JunkIce 471 117 554ms 17 Jan 2025 909th snooze92 🇫🇷 469 139 11ms 5 Mar 2025 910th snoozingnewt 🇨🇦 469 253 40ms 2 Nov 2025 911th balloffur 467 143 5ms 7 Dec 2025 912th brimstonetrader 465 140 18ms 6 Jan 2025 913th PyryL 🇫🇮 462 141 11ms 22 Jan 2025 914th HumanoidCPU 461 155 440ms 1 Feb 2025 914th dokutan 461 155 392ms 30 Mar 2025 916th yoshykai 460 183 444ms 10 Apr 2025 917th madex 🇩🇪 459 142 18ms 4 Jan 2025 918th HumanoidCPU 458 220 30ms 6 Nov 2025 919th snoozingnewt 🇨🇦 457 155 163ms 2 Nov 2025 920th galloj 🇨🇿 456 143 16ms 23 Jan 2025 921st snoozingnewt 🇨🇦 456 158 139ms 2 Nov 2025 922nd snoozingnewt 🇨🇦 454 111 1,276ms 2 Nov 2025 923rd CheeseCake628 🇳🇴 452 144 12ms 19 May 2025 924th mhgockel 451 148 4ms 21 Jun 2025 925th TaserTheFox 🇺🇸 449 145 12ms 22 Feb 2025 926th snoozingnewt 🇨🇦 448 187 1,496ms 2 Nov 2025 927th osNiko 🇧🇷 445 81 50ms 22 Dec 2025 928th nullshallot 445 111 356ms 5 Jan 2025 929th martinorav 440 148 13ms 20 Jan 2025 929th qwjhvbxi 440 148 18ms 21 Jan 2025 931st isaiah0311 🇺🇸 439 152 5ms 1 Feb 2026 932nd blaztoma 🇱🇹 435 107 321ms 29 Oct 2025 933rd ComputerKWasTaken 🇺🇸 434 150 12ms 20 Jan 2025 934th Chinay-Domitrix 🇺🇸 432 124 2,797ms 24 days ago 935th iczelia 🇩🇪 432 163 5ms 21 Sep 2025 936th atazzam 🇺🇸 429 152 12ms 16 Jan 2025 936th Andrey2001 429 152 12ms 1 Feb 2026 938th CaedenHarper 🇨🇦 416 51 81ms 14 days ago 939th Zhenyu-Bo 412 158 11ms 1 Aug 2025 940th CaedenHarper 🇨🇦 411 235 6ms 14 Nov 2025 941st snoozingnewt 🇨🇦 409 241 43ms 2 Nov 2025 942nd CheeseCake628 🇳🇴 408 135 492ms 18 Oct 2025 943rd vyx777 408 214 14ms 11 Jan 2025 943rd non-bin 408 214 11ms 28 Jun 2025 945th snoozingnewt 🇨🇦 408 247 26ms 2 Nov 2025 945th snoozingnewt 🇨🇦 408 247 5ms 2 Nov 2025 947th mbittner20 405 161 12ms 7 Feb 2025 948th HumanoidCPU 403 125 1,296ms 6 Nov 2025 949th KatieLG 🇬🇧 402 85 21ms 6 Jan 2025 950th KatieLG 🇬🇧 402 270 32ms 5 Jan 2025 951st dokutan 394 157 194ms 13 Nov 2025 952nd KatieLG 🇬🇧 391 216 2ms 2 Oct 2025 953rd WillowWispy 388 168 12ms 22 Mar 2025 954th KatieLG 🇬🇧 387 183 145ms 21 Nov 2025 955th chartung17 386 169 21ms 7 Apr 2025 956th gnuvince 385 55 2ms 29 Jun 2025 957th Andrey2001 383 144 463ms 28 Jan 2026 958th robin-scragg 379 172 12ms 7 Jul 2025 959th The-Wolfson 378 242 102ms 22 Jan 2025 960th MeWhenI 🇻🇦 370 103 1,352ms 15 Sep 2025 First Prev 881–960 of 1,074 Next Last