The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 days. Why not try and solve them ahead of time?
Leyland Numbers 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 801st bac0id 684 182 3,798ms 11 Jan 2025 802nd janlelis 683 98 11ms 10 Feb 2021 802nd nathanadams 🇳🇿 683 98 10ms 18 Aug 2021 802nd weliveinhell 🇭🇹 683 98 12ms 23 Oct 2023 802nd Protothor 683 98 11ms 15 days ago 806th WhoisDavid 683 175 227ms 11 Oct 2020 807th arctouch-cristiannevianna 682 166 397ms 15 Jun 2023 808th emgordon154 681 51 3ms 8 days ago 809th Msleizak 🇫🇷 680 83 4,077ms 12 Dec 2023 809th snoozingnewt 🇨🇦 680 83 285ms 13 Oct 2025 811th raphaelimahorn 680 180 394ms 13 days ago 812th astdefu 680 183 2,893ms 8 Dec 2022 813th The3gs 679 89 10ms 29 Aug 2020 813th geofft 679 89 11ms 11 Dec 2020 813th b4dpxl 679 89 10ms 9 Nov 2021 813th AbelPelser 679 89 22ms 3 Jul 2022 813th TaserTheFox 🇺🇸 679 89 10ms 28 Feb 2023 813th CheeseCake628 🇳🇴 679 89 10ms 6 Mar 2023 813th ssbhatt4321 679 89 11ms 14 Oct 2023 820th Ripick 679 122 165ms 23 May 2025 821st vgamula 🇺🇦 678 114 9ms 26 Jan 2024 822nd roavin 678 167 443ms 24 Jun 2022 822nd Yewzir 🇧🇪 678 167 381ms 9 May 2023 824th daisy-lau 676 99 12ms 31 Jul 2020 824th didion0 🇺🇸 676 99 11ms 7 May 2021 824th inventshah 676 99 14ms 6 May 2022 824th LukeBridges 🇬🇧 676 99 9ms 24 Oct 2022 824th madeforlosers 676 99 12ms 6 Nov 2023 824th alexsave 676 99 13ms 29 Oct 2024 824th Lv0Sys 🇵🇱 676 99 11ms 3 Dec 2025 831st DialFrost 🇸🇬 676 118 3ms 13 Apr 2025 832nd msbranicky 676 142 189ms 1 Jan 2024 833rd NewDefectus 🇮🇱 676 156 2ms 23 Jun 2021 834th Yax42 🇫🇷 676 181 409ms 7 Oct 2025 835th saito-ta 🇯🇵 675 62 3ms 16 Aug 2024 836th RockOfStone 674 112 2ms 8 Nov 2021 837th jerrandolph 673 221 293ms 21 Oct 2023 837th dbut2 🇦🇺 673 221 309ms 18 Jul 2024 839th michelebastione 🇮🇹 672 90 10ms 24 Aug 2020 839th ArmaanAS 672 90 10ms 11 Mar 2021 839th cb597 672 90 10ms 23 Jul 2022 839th 0-4849 672 90 10ms 4 Nov 2022 839th namelessiw 672 90 10ms 9 Jul 2024 839th denkyuu1 672 90 10ms 15 Feb 2026 845th Shanethegamer 🇺🇸 672 168 99ms 17 Feb 2023 846th SirBogman 🇺🇸 670 100 16ms 29 Nov 2021 846th Giga-Bowser 670 100 11ms 3 Jan 2022 846th Andrey-Plotnikov 670 100 11ms 19 Aug 2023 846th coreynash 670 100 10ms 3 Nov 2023 846th KatieLG 🇬🇧 670 100 15ms 5 Oct 2025 851st msbranicky 670 119 5ms 8 Aug 2023 852nd msbranicky 669 86 404ms 17 Jan 2024 852nd Andrey2001 669 86 455ms 1 Feb 2026 854th DialFrost 🇸🇬 669 105 9ms 6 Nov 2025 855th Yewzir 🇧🇪 669 183 386ms 2 Oct 2025 856th frosster 🇨🇦 668 113 2ms 14 May 2023 857th Alex-x90 🇺🇸 668 158 2ms 10 Dec 2024 858th Yewzir 🇧🇪 667 91 2ms 19 Dec 2024 858th snoozingnewt 🇨🇦 667 91 84ms 13 Oct 2025 860th Liibe 665 184 471ms 25 Sep 2025 861st GolfingSuccess 🇬🇷 665 187 88ms 8 Nov 2023 862nd marcin7Cd 664 91 10ms 11 Dec 2020 862nd amollberg 🇸🇪 664 91 10ms 15 Jan 2022 862nd Bonjour27891 🇻🇳 664 91 10ms 4 Mar 2022 862nd nstearns96 🇬🇧 664 91 19ms 29 Nov 2022 862nd AlexanderFair 664 91 10ms 11 Jul 2023 862nd adamnielson42 🇺🇸 664 91 11ms 22 Aug 2023 862nd jhu04 664 91 11ms 18 Jan 2024 862nd jacekwladzinski 664 91 9ms 4 Oct 2025 870th Waffle3z 663 64 47ms 22 Jan 2021 871st dokutan 663 87 148ms 20 Apr 2025 872nd fitzdotlol 🇺🇸 663 101 12ms 28 Mar 2022 873rd pkasting 663 159 4ms 6 Sep 2020 874th Shanethegamer 🇺🇸 662 93 1,409ms 16 Feb 2023 875th Adelzu 662 171 419ms 21 Nov 2021 875th Matgc04 662 171 413ms 3 Jun 2024 875th postie77 662 171 450ms 14 Aug 2024 878th janbehrens 🇩🇪 659 148 494ms 26 Mar 2022 879th MeWhenI 🇻🇦 658 113 4ms 23 May 2023 880th Jesperb21 658 172 429ms 21 Nov 2021 First Prev 801–880 of 1,896 Next Last