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?
Factorial Factorisation 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 401st CaedenHarper 🇨🇦 681 117 556ms 29 Jul 2025 402nd MeWhenI 🇻🇦 681 157 65ms 21 Apr 2024 403rd Shanethegamer 🇺🇸 679 107 412ms 13 Apr 2024 404th MeWhenI 🇻🇦 679 167 122ms 21 Apr 2024 405th olleicua 🇺🇸 678 101 109ms 23 Apr 2024 406th voytxt 🇨🇿 678 118 10ms 25 Jul 2024 407th MeWhenI 🇻🇦 678 125 2ms 21 Apr 2024 408th Bulmenisaurus 677 123 17ms 1 Nov 2024 408th CaedenHarper 🇨🇦 677 123 16ms 15 Aug 2025 408th HETHAT 🇩🇿 677 123 16ms 24 Sep 2025 411th anter69 🇭🇺 675 115 1,293ms 13 Mar 2025 412th MeWhenI 🇻🇦 675 150 3ms 22 Apr 2024 413th MeWhenI 🇻🇦 674 153 40ms 26 Jun 2024 414th MeWhenI 🇻🇦 672 132 172ms 21 Apr 2024 415th emgordon154 672 170 80ms 18 days ago 416th Shanethegamer 🇺🇸 670 116 61ms 16 Apr 2024 417th m-tkach 🇺🇦 670 119 478ms 14 Apr 2024 418th msbranicky 666 125 12ms 13 Apr 2024 418th FlorianCassayre 🇫🇷 666 125 16ms 5 May 2024 418th guilhem-roy 🇫🇷 666 125 12ms 29 May 2025 418th blaztoma 🇱🇹 666 125 12ms 28 Sep 2025 418th 77Tigers 666 125 16ms 16 Jan 2026 423rd galloj 🇨🇿 664 691 1ms 16 Apr 2024 424th MeWhenI 🇻🇦 662 132 160ms 28 Oct 2024 425th JOrE20 661 121 13ms 21 Feb 2026 426th elgan65536 🇺🇸 660 126 16ms 13 Apr 2024 426th inventshah 660 126 19ms 15 Apr 2024 426th emgordon154 660 126 16ms 12 Apr 2025 426th khaninm 660 126 14ms 3 Jun 2025 426th fkantelberg 660 126 16ms 10 Jul 2025 431st albanian-laundromat 659 388 70ms 8 days ago 432nd Natanaelel 🇸🇪 658 111 7ms 11 Jan 2026 433rd emgordon154 658 121 521ms 12 Apr 2025 434th inventshah 657 129 2ms 29 Mar 2025 435th Shanethegamer 🇺🇸 656 152 1,343ms 13 Apr 2024 436th jatloe 655 127 67ms 8 Oct 2024 436th klixel 🇨🇦 655 127 92ms 8 Apr 2025 438th emgordon154 655 173 142ms 18 Feb 2025 439th MeWhenI 🇻🇦 654 125 1,145ms 15 Sep 2025 440th duckyluuk 🇳🇱 654 162 105ms 12 Jun 2025 441st msbranicky 654 173 10ms 18 Apr 2024 442nd dokutan 654 701 1ms 22 Apr 2024 443rd BlankSpruce 652 130 2ms 21 Aug 2024 444th HumanoidCPU 652 167 484ms 8 Nov 2025 445th thienudomsrirungruang 650 128 343ms 15 Apr 2024 445th mathisfun271 650 128 13ms 1 Jun 2024 445th cros107 🇦🇺 650 128 15ms 12 Jan 2025 448th emgordon154 650 139 2,676ms 13 Nov 2024 449th ei14 650 706 1ms 8 May 2024 450th elgan65536 🇺🇸 647 131 1ms 15 Apr 2024 451st MeWhenI 🇻🇦 646 140 2,884ms 24 Oct 2024 452nd mousetail 🇳🇱 645 123 19ms 17 Aug 2024 453rd Protothor 645 124 16ms 26 Feb 2026 454th hellwue 645 129 11ms 21 Jun 2024 454th plcc0 645 129 148ms 23 Apr 2025 454th StefanHabel 🇨🇦 645 129 15ms 22 days ago 457th albanian-laundromat 643 121 20ms 25 Dec 2025 458th DialFrost 🇸🇬 641 148 44ms 25 Apr 2025 459th Artemis21 🇬🇧 640 130 19ms 15 Jan 2025 460th MeWhenI 🇻🇦 638 137 2ms 26 Jun 2024 461st retrohun 637 122 7ms 31 Dec 2024 462nd msbranicky 637 125 643ms 13 Apr 2024 463rd CatsAreFluffy 637 178 135ms 3 Nov 2024 464th IsaacAlexBarden 635 131 20ms 24 Mar 2025 464th keelimeguy 🇺🇸 635 131 19ms 14 Jun 2025 466th Shanethegamer 🇺🇸 634 140 175ms 15 Apr 2024 467th typeswitch-dev 🇵🇹 633 187 9ms 25 Jun 2024 468th BambooleanLogic 🇸🇪 630 127 12ms 15 May 2024 468th FlorianCassayre 🇫🇷 630 127 14ms 5 Jun 2024 470th TobyBoyne 🇬🇧 630 132 667ms 5 Mar 2025 471st blaztoma 🇱🇹 630 231 122ms 30 Nov 2025 472nd dokutan 629 130 1,251ms 8 Nov 2025 473rd albanian-laundromat 627 127 642ms 4 Aug 2025 474th quimey 626 133 17ms 27 May 2024 474th tobyLovick 626 133 12ms 3 Mar 2025 474th wuduculfre 626 133 12ms 3 Aug 2025 477th zakariamouhid 625 128 13ms 13 Apr 2024 477th gigaprofisi 🇺🇸 625 128 12ms 23 Jul 2025 479th FlyingPenguin223 625 162 7ms 26 Sep 2024 480th Solathian 624 117 16ms 14 days ago First Prev 401–480 of 1,485 Next Last