The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 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 snoozingnewt 🇨🇦 469 253 40ms 2 Nov 2025 882nd balloffur 467 143 5ms 7 Dec 2025 883rd brimstonetrader 465 140 18ms 6 Jan 2025 884th PyryL 🇫🇮 462 141 11ms 22 Jan 2025 885th HumanoidCPU 461 155 440ms 1 Feb 2025 885th dokutan 461 155 392ms 30 Mar 2025 887th madex 🇩🇪 459 142 18ms 4 Jan 2025 888th yoshykai 459 183 444ms 10 Apr 2025 889th HumanoidCPU 458 220 30ms 6 Nov 2025 890th snoozingnewt 🇨🇦 457 155 163ms 2 Nov 2025 891st galloj 🇨🇿 456 143 16ms 23 Jan 2025 892nd snoozingnewt 🇨🇦 456 158 139ms 2 Nov 2025 893rd snoozingnewt 🇨🇦 453 111 1,276ms 2 Nov 2025 894th CheeseCake628 🇳🇴 452 144 12ms 19 May 2025 895th mhgockel 451 148 4ms 21 Jun 2025 896th TaserTheFox 🇺🇸 449 145 12ms 22 Feb 2025 897th snoozingnewt 🇨🇦 448 187 1,453ms 2 Nov 2025 898th emgordon154 447 124 10ms 30 Jun 2025 899th osNiko 🇧🇷 445 81 50ms 22 Dec 2025 900th nullshallot 445 111 356ms 5 Jan 2025 901st blaztoma 🇱🇹 442 107 321ms 29 Oct 2025 902nd martinorav 440 148 13ms 20 Jan 2025 902nd qwjhvbxi 440 148 18ms 21 Jan 2025 904th isaiah0311 🇺🇸 439 152 5ms 1 Feb 2026 905th Chinay-Domitrix 🇺🇸 438 124 2,797ms 22 days ago 906th ComputerKWasTaken 🇺🇸 434 150 12ms 20 Jan 2025 907th iczelia 🇩🇪 432 163 5ms 21 Sep 2025 908th atazzam 🇺🇸 429 152 12ms 16 Jan 2025 908th Andrey2001 429 152 12ms 1 Feb 2026 910th CaedenHarper 🇨🇦 415 51 81ms 13 days ago 911th Zhenyu-Bo 412 158 11ms 1 Aug 2025 912th CaedenHarper 🇨🇦 411 235 6ms 14 Nov 2025 913th snoozingnewt 🇨🇦 409 241 43ms 2 Nov 2025 914th CheeseCake628 🇳🇴 408 135 492ms 18 Oct 2025 915th vyx777 408 214 10ms 11 Jan 2025 915th non-bin 408 214 11ms 28 Jun 2025 917th snoozingnewt 🇨🇦 408 247 26ms 2 Nov 2025 918th mbittner20 405 161 12ms 7 Feb 2025 919th snoozingnewt 🇨🇦 405 247 5ms 2 Nov 2025 920th HumanoidCPU 403 125 1,296ms 6 Nov 2025 921st KatieLG 🇬🇧 402 85 21ms 6 Jan 2025 922nd KatieLG 🇬🇧 402 270 32ms 5 Jan 2025 923rd dokutan 397 157 194ms 13 Nov 2025 924th KatieLG 🇬🇧 390 216 2ms 2 Oct 2025 925th WillowWispy 388 168 12ms 22 Mar 2025 926th KatieLG 🇬🇧 387 183 145ms 21 Nov 2025 927th chartung17 386 169 21ms 7 Apr 2025 928th gnuvince 384 55 2ms 29 Jun 2025 929th Andrey2001 383 144 463ms 28 Jan 2026 930th robin-scragg 379 172 12ms 7 Jul 2025 931st The-Wolfson 378 242 102ms 22 Jan 2025 932nd snoozingnewt 🇨🇦 375 239 15ms 2 Nov 2025 933rd MeWhenI 🇻🇦 370 103 1,352ms 15 Sep 2025 934th dokutan 363 182 69ms 12 Feb 2025 935th Benned-H 362 180 12ms 12 Jan 2025 936th shaneliu-zf 🇹🇼 349 191 2ms 16 Apr 2025 937th matejmatik123 🇸🇰 345 243 1,417ms 15 Dec 2025 938th Scenes7 343 190 19ms 9 Jan 2025 938th 40fied4t 343 190 41ms 15 May 2025 940th MiffOttah 343 208 448ms 3 Jan 2026 940th qrakhen 343 208 450ms 18 Feb 2026 942nd firewoods1978 338 193 11ms 13 Jan 2025 943rd HumanoidCPU 334 274 102ms 1 Feb 2025 944th dokutan 331 109 54ms 17 Dec 2025 945th Bananapants22 316 206 14ms 10 Jan 2025 945th robbertvz 316 206 12ms 29 Dec 2025 947th driri85 315 207 10ms 7 Jan 2025 948th dokutan 301 152 77ms 8 Apr 2025 949th zt14427 299 223 5ms 18 Jan 2025 950th scpchicken 🇵🇼 298 71 3ms 11 days ago 951st codeman4033 288 226 12ms 21 Jan 2025 952nd msbranicky 288 354 206ms 6 Jan 2025 953rd error-could-not-find-name 272 78 192ms 11 Mar 2025 954th msbranicky 272 200 2,606ms 9 Jan 2025 955th olleicua 🇺🇸 272 355 6ms 6 Jun 2025 956th dokutan 270 357 6ms 8 Jan 2025 957th Kokusui 🇯🇵 259 144 8ms 6 Feb 2025 958th FortuiteMan 🇫🇷 257 250 34ms 29 Sep 2025 959th mathomp4 248 398 40ms 10 Jan 2025 960th BREMAUCY 🇫🇷 239 71 1,023ms 11 Dec 2025 First Prev 881–960 of 1,045 Next Last