The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 39 hours. Why not try and solve them ahead of time?
Happy Numbers (Long) 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 561st andersk 🇺🇸 822 121 141ms 31 Oct 2022 562nd sean-niemann 🇺🇸 821 28 60ms 22 Jul 2022 562nd lynn 821 28 70ms 22 Jul 2022 562nd MeWhenI 🇻🇦 821 28 74ms 23 Jul 2022 562nd sisyphus-ppcg 🇦🇺 821 28 62ms 24 Jul 2022 562nd jared-hughes 821 28 59ms 29 Jul 2022 562nd AlephSquirrel 821 28 69ms 30 Dec 2022 562nd Steffan153 🇫🇮 821 28 60ms 12 Jan 2023 562nd DialFrost 🇸🇬 821 28 61ms 28 Jan 2023 562nd CornerMercury 🇬🇧 821 28 62ms 24 Aug 2023 562nd ovs-code 🇩🇪 821 28 69ms 2 Feb 2024 562nd snoozingnewt 🇨🇦 821 28 62ms 1 Sep 2024 562nd pardouin 🇫🇷 821 28 63ms 21 Sep 2024 562nd LostSyntax21 🇬🇧 821 28 64ms 8 Jan 2025 562nd edsrzf 🇳🇿 821 28 60ms 9 Mar 2025 562nd CaedenHarper 🇨🇦 821 28 63ms 14 Jul 2025 562nd fuzzylojik-golf 🇺🇸 821 28 64ms 9 Sep 2025 562nd blaztoma 🇱🇹 821 28 67ms 26 Dec 2025 579th sean-niemann 🇺🇸 819 86 2,750ms 30 Oct 2024 580th sean-niemann 🇺🇸 818 92 166ms 8 Oct 2024 581st Shanethegamer 🇺🇸 818 168 1,437ms 27 Mar 2025 582nd jared-hughes 817 83 126ms 11 Sep 2023 583rd error256 815 93 29ms 16 days ago 584th Shanethegamer 🇺🇸 815 101 436ms 13 Apr 2023 584th emgordon154 815 101 469ms 26 May 2025 586th Yewzir 🇧🇪 815 107 39ms 14 Jan 2024 587th snyderek 🇺🇸 815 116 62ms 6 Oct 2024 588th m-tkach 🇺🇦 815 120 27ms 18 Dec 2023 589th Mabeloid 🇳🇴 815 122 131ms 31 Oct 2025 589th CaedenHarper 🇨🇦 815 122 123ms 1 Dec 2025 589th elgan65536 🇺🇸 815 122 127ms 7 Feb 2026 592nd bizy-coder 813 73 167ms 3 Oct 2024 592nd Rubiksmath 813 73 155ms 19 Oct 2024 592nd Seek64 🇩🇪 813 73 166ms 4 Dec 2025 595th snoozingnewt 🇨🇦 812 105 95ms 30 Sep 2025 596th janbehrens 🇩🇪 811 73 10ms 20 Sep 2021 596th didion0 🇺🇸 811 73 48ms 23 Nov 2021 596th KatieLG 🇬🇧 811 73 18ms 5 Apr 2022 596th emgordon154 811 73 12ms 7 Nov 2024 600th edsrzf 🇳🇿 811 88 11ms 7 Jun 2025 601st Shanethegamer 🇺🇸 810 93 151ms 20 Sep 2021 601st Yewzir 🇧🇪 810 93 138ms 27 Mar 2024 603rd AdrienHache 🇫🇷 808 94 433ms 2 Jun 2023 603rd GrayJoKing 🇦🇺 808 94 154ms 23 Oct 2023 603rd billings7 🇬🇧 808 94 431ms 21 May 2024 606th AlephSquirrel 808 104 4ms 6 Aug 2024 607th GolfingSuccess 🇬🇷 808 117 61ms 19 Mar 2025 608th MeWhenI 🇻🇦 807 71 64ms 5 Apr 2025 609th MeWhenI 🇻🇦 807 94 54ms 9 May 2024 610th kimbo 🇺🇸 807 146 295ms 12 Jan 2023 611th Shanethegamer 🇺🇸 805 100 11ms 10 Sep 2022 611th albanian-laundromat 805 100 11ms 24 Dec 2025 613th MeWhenI 🇻🇦 804 90 2ms 10 Oct 2023 614th frankgraziano 804 232 37ms 31 Oct 2025 615th xnor-gate 802 74 150ms 23 Oct 2023 615th csharpython 802 74 20ms 17 Jul 2025 617th AlephSquirrel 802 89 13ms 20 Apr 2023 618th jared-hughes 802 124 135ms 10 Nov 2022 618th Re-Adventures 🇮🇳 802 124 143ms 22 Jun 2023 620th Steffan153 🇫🇮 801 95 21ms 21 Feb 2023 620th Waffle3z 801 95 2ms 26 Dec 2025 622nd tailorspy 801 118 70ms 22 Sep 2024 622nd dokutan 801 118 65ms 6 Nov 2025 624th Shanethegamer 🇺🇸 800 31 6ms 13 Jan 2022 625th c0d3-4-F00d 🇩🇪 800 74 13ms 5 Jan 2022 625th Maznek 800 74 15ms 19 Jun 2023 625th thisishowmymindworks 🇳🇴 800 74 116ms 9 Jun 2024 625th snoozingnewt 🇨🇦 800 74 11ms 1 Sep 2024 625th blaztoma 🇱🇹 800 74 19ms 23 Nov 2025 630th snoozingnewt 🇨🇦 799 66 14ms 1 Sep 2024 630th LostSyntax21 🇬🇧 799 66 3ms 8 Jan 2025 632nd clockworknazo 798 83 13ms 13 Oct 2022 632nd ovs-code 🇩🇪 798 83 13ms 7 Feb 2023 634th brimstonetrader 798 85 122ms 26 Jan 2024 635th inventshah 798 158 415ms 8 Sep 2022 636th Natanaelel 🇸🇪 796 72 71ms 26 Sep 2023 637th snoozingnewt 🇨🇦 796 148 284ms 4 Feb 2024 638th msbranicky 795 91 3ms 11 Oct 2023 639th Herbert00709 🇵🇱 795 119 61ms 4 Sep 2024 639th error256 795 119 67ms 22 Feb 2026 First Prev 561–640 of 2,089 Next Last