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 HumanoidCPU 490 171 64ms 17 Jan 2025 882nd DanielSchmerber 489 172 466ms 9 Jan 2025 883rd snoozingnewt 🇨🇦 489 177 8ms 2 Nov 2025 884th JRaspass 🇬🇧 488 224 307ms 5 Jan 2025 885th codewrite 🇬🇧 487 147 517ms 6 Jan 2026 886th nils-imhoff 487 253 1,647ms 27 Jun 2025 887th HumanoidCPU 484 138 2ms 25 May 2025 888th Ailko 🇧🇪 483 135 29ms 17 Jan 2025 888th itljan30 483 135 12ms 26 Jan 2025 888th smilesformiles3 483 135 18ms 18 Jun 2025 891st gjoacorp 🇬🇧 482 174 447ms 4 Aug 2025 891st dokutan 482 174 64ms 13 Nov 2025 893rd dokutan 480 139 5ms 13 Nov 2025 894th snoozingnewt 🇨🇦 480 192 9ms 2 Nov 2025 895th emgordon154 477 140 5ms 20 Dec 2025 896th bpharaldsson 477 150 472ms 31 Jan 2026 897th snoozingnewt 🇨🇦 474 141 4ms 2 Nov 2025 898th snoozingnewt 🇨🇦 474 196 32ms 2 Nov 2025 899th HumanoidCPU 473 95 6ms 1 Feb 2025 900th snoozingnewt 🇨🇦 473 188 27ms 2 Nov 2025 901st Pale-Vessel 473 216 199ms 23 Sep 2025 902nd HumanoidCPU 472 179 373ms 2 Feb 2025 903rd JunkIce 471 117 554ms 17 Jan 2025 904th snooze92 🇫🇷 469 139 11ms 5 Mar 2025 905th snoozingnewt 🇨🇦 469 253 40ms 2 Nov 2025 906th balloffur 467 143 5ms 7 Dec 2025 907th brimstonetrader 465 140 18ms 6 Jan 2025 908th PyryL 🇫🇮 462 141 11ms 22 Jan 2025 909th HumanoidCPU 461 155 440ms 1 Feb 2025 909th dokutan 461 155 392ms 30 Mar 2025 911th yoshykai 460 183 444ms 10 Apr 2025 912th madex 🇩🇪 459 142 18ms 4 Jan 2025 913th HumanoidCPU 458 220 30ms 6 Nov 2025 914th snoozingnewt 🇨🇦 457 155 163ms 2 Nov 2025 915th galloj 🇨🇿 456 143 16ms 23 Jan 2025 916th snoozingnewt 🇨🇦 456 158 139ms 2 Nov 2025 917th snoozingnewt 🇨🇦 454 111 1,276ms 2 Nov 2025 918th CheeseCake628 🇳🇴 452 144 12ms 19 May 2025 919th mhgockel 451 148 4ms 21 Jun 2025 920th TaserTheFox 🇺🇸 449 145 12ms 22 Feb 2025 921st snoozingnewt 🇨🇦 448 187 1,496ms 2 Nov 2025 922nd osNiko 🇧🇷 445 81 50ms 22 Dec 2025 923rd nullshallot 445 111 356ms 5 Jan 2025 924th martinorav 440 148 13ms 20 Jan 2025 924th qwjhvbxi 440 148 18ms 21 Jan 2025 926th isaiah0311 🇺🇸 439 152 5ms 1 Feb 2026 927th blaztoma 🇱🇹 435 107 321ms 29 Oct 2025 928th ComputerKWasTaken 🇺🇸 434 150 12ms 20 Jan 2025 929th Chinay-Domitrix 🇺🇸 432 124 2,797ms 24 days ago 930th iczelia 🇩🇪 432 163 5ms 21 Sep 2025 931st atazzam 🇺🇸 429 152 12ms 16 Jan 2025 931st Andrey2001 429 152 12ms 1 Feb 2026 933rd CaedenHarper 🇨🇦 415 51 81ms 14 days ago 934th Zhenyu-Bo 412 158 11ms 1 Aug 2025 935th CaedenHarper 🇨🇦 411 235 6ms 14 Nov 2025 936th snoozingnewt 🇨🇦 409 241 43ms 2 Nov 2025 937th CheeseCake628 🇳🇴 408 135 492ms 18 Oct 2025 938th vyx777 408 214 14ms 11 Jan 2025 938th non-bin 408 214 11ms 28 Jun 2025 940th snoozingnewt 🇨🇦 408 247 26ms 2 Nov 2025 940th snoozingnewt 🇨🇦 408 247 5ms 2 Nov 2025 942nd mbittner20 405 161 12ms 7 Feb 2025 943rd HumanoidCPU 403 125 1,296ms 6 Nov 2025 944th KatieLG 🇬🇧 402 85 21ms 6 Jan 2025 945th KatieLG 🇬🇧 402 270 32ms 5 Jan 2025 946th dokutan 394 157 194ms 13 Nov 2025 947th KatieLG 🇬🇧 390 216 2ms 2 Oct 2025 948th WillowWispy 388 168 12ms 22 Mar 2025 949th KatieLG 🇬🇧 387 183 145ms 21 Nov 2025 950th chartung17 386 169 21ms 7 Apr 2025 951st gnuvince 384 55 2ms 29 Jun 2025 952nd Andrey2001 383 144 463ms 28 Jan 2026 953rd robin-scragg 379 172 12ms 7 Jul 2025 954th The-Wolfson 378 242 102ms 22 Jan 2025 955th MeWhenI 🇻🇦 370 103 1,352ms 15 Sep 2025 956th emgordon154 363 124 10ms 30 Jun 2025 957th dokutan 363 182 69ms 12 Feb 2025 958th Benned-H 362 180 12ms 12 Jan 2025 959th snoozingnewt 🇨🇦 353 239 15ms 2 Nov 2025 960th shaneliu-zf 🇹🇼 350 191 2ms 16 Apr 2025 First Prev 881–960 of 1,069 Next Last