The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 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 881st gjoacorp 🇬🇧 482 174 447ms 4 Aug 2025 881st dokutan 482 174 64ms 13 Nov 2025 883rd JOrE20 480 127 123ms 4 Dec 2025 884th madeforlosers 478 173 10ms 14 Jan 2025 885th HumanoidCPU 477 138 2ms 25 May 2025 886th bpharaldsson 477 150 472ms 31 Jan 2026 887th dokutan 474 139 5ms 13 Nov 2025 888th snoozingnewt 🇨🇦 474 196 32ms 2 Nov 2025 889th HumanoidCPU 473 95 6ms 1 Feb 2025 890th snoozingnewt 🇨🇦 473 188 27ms 2 Nov 2025 891st Pale-Vessel 473 216 192ms 23 Sep 2025 892nd yokasuretsu 472 120 13ms 12 Jul 2025 892nd Bmrl7 472 120 18ms 23 Nov 2025 894th emgordon154 471 140 5ms 20 Dec 2025 895th MostParsingVex 471 153 14ms 5 Jan 2025 896th snoozingnewt 🇨🇦 467 141 4ms 2 Nov 2025 897th pquline 464 122 18ms 15 Mar 2025 898th balloffur 461 143 5ms 7 Dec 2025 899th HumanoidCPU 461 155 440ms 1 Feb 2025 899th dokutan 461 155 392ms 30 Mar 2025 901st yoshykai 460 183 444ms 10 Apr 2025 902nd HumanoidCPU 458 220 30ms 6 Nov 2025 903rd vhoulbreque 🇫🇷 457 124 17ms 16 Feb 2025 904th snoozingnewt 🇨🇦 457 155 163ms 2 Nov 2025 905th HumanoidCPU 455 179 373ms 2 Feb 2025 906th snoozingnewt 🇨🇦 454 111 1,276ms 2 Nov 2025 907th Mikey-Beep 🇬🇧 453 125 11ms 8 Jul 2025 908th osNiko 🇧🇷 450 126 12ms 16 Aug 2025 909th snoozingnewt 🇨🇦 448 187 1,496ms 2 Nov 2025 910th Bobini1 🇵🇱 446 127 17ms 15 Jan 2025 910th matsagad 446 127 35ms 16 Jan 2025 912th nullshallot 445 111 356ms 5 Jan 2025 913th mhgockel 445 148 4ms 21 Jun 2025 914th driri85 439 129 11ms 7 Jan 2025 914th tjwrenn 439 129 11ms 27 Jan 2025 916th snoozingnewt 🇨🇦 438 158 139ms 2 Nov 2025 917th snoozingnewt 🇨🇦 437 253 40ms 2 Nov 2025 918th jtaxen 433 131 49ms 27 Jan 2025 919th isaiah0311 🇺🇸 433 152 5ms 1 Feb 2026 920th Chinay-Domitrix 🇺🇸 432 124 2,797ms 25 days ago 921st iczelia 🇩🇪 432 163 5ms 21 Sep 2025 922nd jameswmccarty 429 132 12ms 7 Mar 2025 923rd blaztoma 🇱🇹 420 107 321ms 29 Oct 2025 924th dokutan 420 109 75ms 16 Apr 2025 925th Ailko 🇧🇪 420 135 29ms 17 Jan 2025 925th itljan30 420 135 12ms 26 Jan 2025 925th smilesformiles3 420 135 18ms 18 Jun 2025 928th CaedenHarper 🇨🇦 416 51 81ms 16 days ago 929th non-bin 413 200 11ms 28 Jun 2025 930th CaedenHarper 🇨🇦 411 235 6ms 14 Nov 2025 931st snoozingnewt 🇨🇦 409 241 43ms 2 Nov 2025 932nd snooze92 🇫🇷 408 139 11ms 5 Mar 2025 933rd snoozingnewt 🇨🇦 408 247 26ms 2 Nov 2025 933rd snoozingnewt 🇨🇦 408 247 5ms 2 Nov 2025 935th brimstonetrader 405 140 18ms 6 Jan 2025 936th HumanoidCPU 403 125 1,296ms 6 Nov 2025 937th KatieLG 🇬🇧 402 85 21ms 6 Jan 2025 938th PyryL 🇫🇮 402 141 11ms 22 Jan 2025 939th KatieLG 🇬🇧 402 270 32ms 5 Jan 2025 940th madex 🇩🇪 399 142 18ms 4 Jan 2025 941st galloj 🇨🇿 396 143 16ms 23 Jan 2025 942nd dokutan 394 157 194ms 13 Nov 2025 943rd TaserTheFox 🇺🇸 391 145 12ms 22 Feb 2025 944th KatieLG 🇬🇧 391 216 2ms 2 Oct 2025 945th KatieLG 🇬🇧 387 183 145ms 21 Nov 2025 946th vyx777 386 214 14ms 11 Jan 2025 947th gnuvince 385 55 2ms 29 Jun 2025 948th martinorav 383 148 13ms 20 Jan 2025 948th qwjhvbxi 383 148 18ms 21 Jan 2025 950th ComputerKWasTaken 🇺🇸 378 150 12ms 20 Jan 2025 951st The-Wolfson 378 242 104ms 22 Jan 2025 952nd snoozingnewt 🇨🇦 375 192 9ms 2 Nov 2025 953rd atazzam 🇺🇸 373 152 12ms 16 Jan 2025 953rd Andrey2001 373 152 12ms 1 Feb 2026 955th MeWhenI 🇻🇦 370 103 1,352ms 15 Sep 2025 956th emgordon154 363 124 10ms 30 Jun 2025 957th Zhenyu-Bo 359 158 11ms 1 Aug 2025 958th snoozingnewt 🇨🇦 353 239 15ms 2 Nov 2025 959th Andrey2001 352 144 463ms 28 Jan 2026 960th mbittner20 352 161 12ms 7 Feb 2025 First Prev 881–960 of 1,069 Next Last