The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 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 janbehrens 🇩🇪 606 185 294ms 22 Jun 2023 642nd 09cf 605 114 15ms 21 Sep 2023 643rd MeWhenI 🇻🇦 604 76 48ms 16 Apr 2023 644th Shanethegamer 🇺🇸 604 102 115ms 8 Jun 2022 645th Shanethegamer 🇺🇸 603 74 56ms 7 Jun 2022 646th msbranicky 603 87 19ms 23 Jul 2023 647th elgan65536 🇺🇸 603 151 163ms 9 Mar 2024 648th j-Ewan 603 186 299ms 11 Mar 2022 649th MeWhenI 🇻🇦 603 318 1,016ms 29 Aug 2023 650th Larento 602 95 33ms 10 Oct 2023 651st neihousaigaai 600 187 291ms 22 Oct 2024 652nd stefangimmillaro 599 113 113ms 4 Nov 2022 653rd guilhem-roy 🇫🇷 596 88 96ms 1 Mar 2022 653rd michelebastione 🇮🇹 596 88 85ms 2 Mar 2022 655th KatieLG 🇬🇧 596 96 25ms 21 Feb 2023 655th thisishowmymindworks 🇳🇴 596 96 29ms 28 Jun 2024 657th HumanoidCPU 595 84 473ms 27 May 2024 658th strout 595 106 528ms 17 Aug 2022 659th edsrzf 🇳🇿 592 129 12ms 11 Nov 2025 660th Re-Adventures 🇮🇳 591 154 188ms 20 Jul 2023 661st Troon 590 89 40ms 29 Sep 2022 661st b10011 🇫🇮 590 89 38ms 8 Jan 2023 661st AbhilashaTandon 590 89 12ms 24 Sep 2023 661st eddvrs 590 89 12ms 20 Dec 2023 661st JOrE20 590 89 11ms 10 Feb 2026 666th CornerMercury 🇬🇧 590 190 311ms 11 Feb 2026 667th junkondo-jp 589 97 34ms 25 Jun 2024 667th CaedenHarper 🇨🇦 589 97 21ms 27 Jan 2025 669th DaCuteRaccoon 588 326 824ms 1 Dec 2022 670th MeWhenI 🇻🇦 587 110 15ms 21 Jul 2023 671st albanian-laundromat 587 137 89ms 4 Sep 2025 672nd keelimeguy 🇺🇸 584 192 303ms 28 Apr 2025 673rd jfallon1997 583 90 32ms 7 Sep 2022 673rd xDragoxboi 583 90 12ms 30 Jun 2025 673rd jacekwladzinski 583 90 11ms 5 Oct 2025 676th trinityy-7 583 98 14ms 17 Mar 2024 676th snoozingnewt 🇨🇦 583 98 20ms 29 Sep 2025 676th iczelia 🇩🇪 583 98 22ms 17 Oct 2025 679th Shanethegamer 🇺🇸 581 79 40ms 7 Jun 2022 680th kimbo 🇺🇸 581 193 284ms 13 Jan 2023 681st MeWhenI 🇻🇦 579 87 1,851ms 28 Jan 2023 682nd CaedenHarper 🇨🇦 579 331 338ms 27 Jan 2025 683rd Shanethegamer 🇺🇸 578 117 35ms 12 Sep 2022 684th CaedenHarper 🇨🇦 578 194 298ms 2 Dec 2025 685th commandz0 🇺🇸 577 91 102ms 21 Sep 2022 685th MaxElf999 577 91 3,503ms 28 Sep 2022 685th fkantelberg 577 91 53ms 7 Aug 2023 685th sultan 577 91 30ms 5 Mar 2024 689th albanian-laundromat 577 332 3,096ms 8 Dec 2025 690th 5cw 🇺🇸 575 48 7ms 10 Apr 2023 691st msbranicky 575 87 513ms 17 Jan 2024 692nd 77Tigers 573 110 319ms 29 May 2024 692nd iczelia 🇩🇪 573 110 274ms 17 Oct 2025 694th NickTheEASDude 🇺🇸 573 121 19ms 1 May 2024 695th anter69 🇭🇺 572 78 83ms 12 Feb 2024 696th advl 572 100 102ms 14 Feb 2025 697th Lv0Sys 🇵🇱 572 196 282ms 27 Feb 2026 698th Ailko 🇧🇪 570 92 11ms 6 May 2022 698th ComputerKWasTaken 🇺🇸 570 92 11ms 23 Oct 2024 700th emgordon154 569 160 224ms 5 Mar 2025 701st commandz0 🇺🇸 568 88 605ms 1 Sep 2025 702nd prestosilver 🇺🇸 567 117 184ms 11 days ago 703rd albanian-laundromat 566 98 2,323ms 5 Nov 2025 704th a6166231 🇨🇳 566 101 12ms 5 Jun 2025 705th MeWhenI 🇻🇦 566 149 43ms 6 Jun 2023 706th fantaize 566 161 188ms 19 days ago 707th KatieLG 🇬🇧 566 198 372ms 22 Jan 2023 708th KatieLG 🇬🇧 565 109 207ms 22 Jan 2023 709th madex 🇩🇪 565 122 3ms 29 Mar 2022 710th TobyBoyne 🇬🇧 564 93 3,365ms 3 Mar 2022 710th jtaxen 564 93 101ms 26 Mar 2024 710th jameswmccarty 564 93 10ms 10 Jul 2024 710th codingisgreatbutiamnot 564 93 721ms 6 Aug 2025 710th Googolplexo 🇷🇺 564 93 192ms 33 hours ago 715th Shanethegamer 🇺🇸 564 150 96ms 4 Oct 2024 716th rak1507 🇬🇧 563 49 2ms 2 Mar 2022 717th KatieLG 🇬🇧 563 142 519ms 13 Nov 2022 718th h3ra993huskp 🇯🇵 563 163 587ms 30 Nov 2025 719th pzagrebin 561 99 61ms 9 Jul 2022 719th janbehrens 🇩🇪 561 99 123ms 2 Jul 2023 First Prev 641–720 of 1,589 Next Last