The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 34 hours. Why not try and solve them ahead of time?
Leyland 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 881st DialFrost 🇸🇬 691 139 189ms 10 Nov 2025 882nd atazzam 🇺🇸 690 103 14ms 2 Apr 2022 882nd vishwathg 690 103 10ms 21 Aug 2022 882nd fredrik-bakke 🇳🇴 690 103 10ms 2 Oct 2022 882nd willschremmer 690 103 10ms 28 Apr 2024 882nd wuzekai518 690 103 10ms 23 Jul 2024 882nd Mabeloid 🇳🇴 690 103 9ms 22 Sep 2024 882nd WillowWispy 690 103 10ms 17 Mar 2025 889th Andriamanitra 🇫🇮 690 108 4ms 13 Jun 2024 890th CaedenHarper 🇨🇦 689 216 309ms 12 Nov 2025 891st Shanethegamer 🇺🇸 688 116 2ms 2 Mar 2023 892nd MeWhenI 🇻🇦 686 90 1,320ms 12 May 2023 893rd tigerdan2 🇩🇪 685 179 483ms 30 Nov 2025 894th janlelis 684 98 11ms 10 Feb 2021 894th nathanadams 🇳🇿 684 98 10ms 18 Aug 2021 894th weliveinhell 🇭🇹 684 98 12ms 23 Oct 2023 894th Protothor 684 98 11ms 19 days ago 898th bac0id 684 182 3,798ms 11 Jan 2025 899th emgordon154 683 51 3ms 12 days ago 900th Attero 🇸🇪 683 69 112ms 18 Oct 2020 901st ydevor 🇮🇱 683 104 10ms 10 Mar 2021 901st Fishron 683 104 13ms 19 Oct 2021 903rd arctouch-cristiannevianna 683 166 397ms 15 Jun 2023 904th WhoisDavid 683 175 242ms 11 Oct 2020 905th Msleizak 🇫🇷 681 83 4,077ms 12 Dec 2023 905th snoozingnewt 🇨🇦 681 83 285ms 13 Oct 2025 907th raphaelimahorn 681 180 394ms 18 days ago 908th astdefu 681 183 2,893ms 8 Dec 2022 909th FortuiteMan 🇫🇷 681 276 2,011ms 26 Jan 2026 910th Ripick 680 122 165ms 23 May 2025 911th roavin 679 167 443ms 24 Jun 2022 911th Yewzir 🇧🇪 679 167 381ms 9 May 2023 913th daisy-lau 677 99 12ms 31 Jul 2020 913th BBoehm 🇩🇪 677 99 10ms 18 Feb 2021 913th didion0 🇺🇸 677 99 11ms 7 May 2021 913th inventshah 677 99 14ms 6 May 2022 913th LukeBridges 🇬🇧 677 99 9ms 24 Oct 2022 913th madeforlosers 677 99 12ms 6 Nov 2023 913th alexsave 677 99 13ms 29 Oct 2024 913th Lv0Sys 🇵🇱 677 99 11ms 3 Dec 2025 921st DialFrost 🇸🇬 677 118 3ms 13 Apr 2025 922nd msbranicky 677 142 189ms 1 Jan 2024 923rd NewDefectus 🇮🇱 677 156 2ms 23 Jun 2021 924th Yax42 🇫🇷 677 181 409ms 7 Oct 2025 925th mathwiz42 676 105 10ms 18 Aug 2020 925th PFischbeck 676 105 11ms 31 Oct 2020 925th estomagordo 🇳🇱 676 105 9ms 6 Dec 2021 925th 0dyse 676 105 14ms 12 Sep 2025 929th RockOfStone 675 112 2ms 8 Nov 2021 930th AlexDaniel 🇪🇪 673 70 108ms 17 Aug 2020 931st Shanethegamer 🇺🇸 673 168 106ms 17 Feb 2023 932nd jerrandolph 673 221 293ms 21 Oct 2023 932nd dbut2 🇦🇺 673 221 309ms 18 Jul 2024 934th GrayJoKing 🇦🇺 671 95 160ms 14 Aug 2024 934th MeWhenI 🇻🇦 671 95 142ms 25 Oct 2024 936th msbranicky 671 119 5ms 8 Aug 2023 937th SirBogman 🇺🇸 670 100 16ms 29 Nov 2021 937th Giga-Bowser 670 100 11ms 3 Jan 2022 937th Andrey-Plotnikov 670 100 11ms 19 Aug 2023 937th coreynash 670 100 10ms 3 Nov 2023 941st DialFrost 🇸🇬 670 105 9ms 6 Nov 2025 942nd artieleach 670 106 14ms 7 Feb 2021 942nd martinnorling 🇸🇪 670 106 10ms 31 Jan 2022 942nd dylanjones92 670 106 10ms 26 Jan 2024 942nd Europe2048 670 106 10ms 17 days ago 946th Yewzir 🇧🇪 670 183 386ms 2 Oct 2025 947th Yewzir 🇧🇪 669 91 2ms 19 Dec 2024 948th frosster 🇨🇦 669 113 2ms 14 May 2023 949th Liibe 666 184 471ms 25 Sep 2025 950th GolfingSuccess 🇬🇷 666 187 88ms 8 Nov 2023 951st pkasting 665 159 4ms 6 Sep 2020 951st Alex-x90 🇺🇸 665 159 2ms 10 Dec 2024 953rd fitzdotlol 🇺🇸 664 101 12ms 28 Mar 2022 954th dostuffthatmatters 664 107 10ms 26 Jul 2020 954th guilhem-roy 🇫🇷 664 107 10ms 28 Feb 2022 954th celiendonze 🇨🇭 664 107 13ms 20 Apr 2023 954th Stockoh 🇫🇷 664 107 17ms 2 Oct 2024 954th tomh1012 664 107 10ms 24 Feb 2026 959th snoozingnewt 🇨🇦 663 71 108ms 13 Oct 2025 960th Shanethegamer 🇺🇸 663 93 1,409ms 16 Feb 2023 First Prev 881–960 of 1,916 Next Last