The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 8 days. Why not try and solve them ahead of time?
Lucky Numbers 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 641st 09cf 605 114 15ms 21 Sep 2023 642nd MeWhenI 🇻🇦 604 76 48ms 16 Apr 2023 643rd Shanethegamer 🇺🇸 604 102 109ms 8 Jun 2022 644th Shanethegamer 🇺🇸 603 74 56ms 7 Jun 2022 645th msbranicky 603 87 19ms 23 Jul 2023 646th elgan65536 🇺🇸 603 151 157ms 9 Mar 2024 647th j-Ewan 603 186 299ms 11 Mar 2022 648th MeWhenI 🇻🇦 603 318 1,016ms 29 Aug 2023 649th Larento 602 95 32ms 10 Oct 2023 650th stefangimmillaro 599 113 113ms 4 Nov 2022 651st neihousaigaai 599 187 291ms 22 Oct 2024 652nd guilhem-roy 🇫🇷 596 88 96ms 1 Mar 2022 652nd michelebastione 🇮🇹 596 88 85ms 2 Mar 2022 654th KatieLG 🇬🇧 596 96 24ms 21 Feb 2023 654th thisishowmymindworks 🇳🇴 596 96 18ms 28 Jun 2024 656th HumanoidCPU 595 84 473ms 27 May 2024 657th strout 595 106 528ms 17 Aug 2022 658th edsrzf 🇳🇿 592 129 12ms 11 Nov 2025 659th Re-Adventures 🇮🇳 591 154 153ms 20 Jul 2023 660th Troon 590 89 40ms 29 Sep 2022 660th b10011 🇫🇮 590 89 38ms 8 Jan 2023 660th AbhilashaTandon 590 89 12ms 24 Sep 2023 660th eddvrs 590 89 12ms 20 Dec 2023 660th JOrE20 590 89 11ms 10 Feb 2026 665th CornerMercury 🇬🇧 590 190 311ms 11 Feb 2026 666th junkondo-jp 589 97 31ms 25 Jun 2024 666th CaedenHarper 🇨🇦 589 97 19ms 27 Jan 2025 668th DaCuteRaccoon 588 326 824ms 1 Dec 2022 669th MeWhenI 🇻🇦 587 110 15ms 21 Jul 2023 670th albanian-laundromat 587 137 89ms 4 Sep 2025 671st keelimeguy 🇺🇸 584 192 303ms 28 Apr 2025 672nd jfallon1997 583 90 32ms 7 Sep 2022 672nd xDragoxboi 583 90 12ms 30 Jun 2025 672nd jacekwladzinski 583 90 11ms 5 Oct 2025 675th trinityy-7 583 98 13ms 17 Mar 2024 675th snoozingnewt 🇨🇦 583 98 19ms 29 Sep 2025 675th iczelia 🇩🇪 583 98 18ms 17 Oct 2025 678th Shanethegamer 🇺🇸 581 79 40ms 7 Jun 2022 679th kimbo 🇺🇸 581 193 284ms 13 Jan 2023 680th MeWhenI 🇻🇦 579 87 1,851ms 28 Jan 2023 681st CaedenHarper 🇨🇦 579 331 338ms 27 Jan 2025 682nd Shanethegamer 🇺🇸 578 117 35ms 12 Sep 2022 683rd CaedenHarper 🇨🇦 578 194 298ms 2 Dec 2025 684th commandz0 🇺🇸 577 91 102ms 21 Sep 2022 684th MaxElf999 577 91 3,503ms 28 Sep 2022 684th fkantelberg 577 91 53ms 7 Aug 2023 684th sultan 577 91 30ms 5 Mar 2024 688th albanian-laundromat 577 332 3,096ms 8 Dec 2025 689th 5cw 🇺🇸 575 48 7ms 10 Apr 2023 690th msbranicky 575 87 513ms 17 Jan 2024 691st 77Tigers 573 110 319ms 29 May 2024 691st iczelia 🇩🇪 573 110 274ms 17 Oct 2025 693rd NickTheEASDude 🇺🇸 573 121 19ms 1 May 2024 694th anter69 🇭🇺 572 78 83ms 12 Feb 2024 695th advl 572 100 90ms 14 Feb 2025 696th Lv0Sys 🇵🇱 572 196 282ms 24 days ago 697th Ailko 🇧🇪 570 92 11ms 6 May 2022 697th ComputerKWasTaken 🇺🇸 570 92 11ms 23 Oct 2024 699th emgordon154 569 160 230ms 5 Mar 2025 700th commandz0 🇺🇸 568 88 605ms 1 Sep 2025 701st prestosilver 🇺🇸 567 117 184ms 5 days ago 702nd albanian-laundromat 566 98 2,323ms 5 Nov 2025 703rd a6166231 🇨🇳 566 101 13ms 5 Jun 2025 704th MeWhenI 🇻🇦 566 149 43ms 6 Jun 2023 705th fantaize 566 161 178ms 13 days ago 706th KatieLG 🇬🇧 566 198 372ms 22 Jan 2023 707th KatieLG 🇬🇧 565 109 181ms 22 Jan 2023 708th madex 🇩🇪 565 122 3ms 29 Mar 2022 709th TobyBoyne 🇬🇧 564 93 3,365ms 3 Mar 2022 709th jtaxen 564 93 101ms 26 Mar 2024 709th jameswmccarty 564 93 10ms 10 Jul 2024 709th codingisgreatbutiamnot 564 93 721ms 6 Aug 2025 713th Shanethegamer 🇺🇸 564 150 96ms 4 Oct 2024 714th rak1507 🇬🇧 563 49 2ms 2 Mar 2022 715th KatieLG 🇬🇧 563 142 519ms 13 Nov 2022 716th h3ra993huskp 🇯🇵 563 163 587ms 30 Nov 2025 717th pzagrebin 561 99 61ms 9 Jul 2022 717th janbehrens 🇩🇪 561 99 123ms 2 Jul 2023 719th DaCuteRaccoon 561 102 24ms 30 Nov 2022 719th dylanarmstrong 561 102 12ms 21 Jan 2024 First Prev 641–720 of 1,584 Next Last