The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 29 hours. Why not try and solve them ahead of time?
Happy Numbers (Long) 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 633rd SectorCorruptor 832 84 295ms 6 days ago 642nd madex 🇩🇪 832 85 2,587ms 14 days ago 643rd h3ra993huskp 🇯🇵 832 113 503ms 30 Nov 2025 644th albanian-laundromat 831 73 1,053ms 23 Sep 2025 645th Shanethegamer 🇺🇸 831 114 64ms 18 Dec 2022 645th Yewzir 🇧🇪 831 114 62ms 14 Jan 2024 647th edsrzf 🇳🇿 831 118 28ms 9 Feb 2026 648th Shanethegamer 🇺🇸 831 120 119ms 13 Jan 2022 648th MeWhenI 🇻🇦 831 120 124ms 9 May 2023 648th emgordon154 831 120 120ms 14 Mar 2025 651st prplz 🇦🇺 830 103 132ms 18 Dec 2021 651st dokutan 830 103 91ms 6 Nov 2025 653rd ovs-code 🇩🇪 830 166 1,426ms 29 Mar 2025 653rd emgordon154 830 166 1,450ms 21 May 2025 655th inventshah 827 60 1,340ms 29 Sep 2023 655th emgordon154 827 60 1,286ms 18 Nov 2024 657th m42km 827 81 624ms 4 Feb 2024 657th Babafaba 827 81 705ms 3 Nov 2025 659th albanian-laundromat 827 96 187ms 13 Nov 2025 660th IanUtley 826 92 3,003ms 24 Oct 2023 661st sean-niemann 🇺🇸 826 106 39ms 21 Apr 2023 662nd Shanethegamer 🇺🇸 825 88 2ms 19 Nov 2025 662nd DialFrost 🇸🇬 825 88 2ms 15 Dec 2025 664th Steffan153 🇫🇮 825 119 109ms 28 Feb 2026 665th neihousaigaai 824 72 14ms 2 Oct 2021 665th stefangimmillaro 824 72 16ms 29 Sep 2023 665th two-bad 🇬🇧 824 72 16ms 25 Feb 2024 668th inventshah 824 98 538ms 10 Sep 2022 668th MeWhenI 🇻🇦 824 98 12ms 16 Aug 2023 670th andersk 🇺🇸 824 121 141ms 31 Oct 2022 671st m-tkach 🇺🇦 824 143 25ms 7 Apr 2022 671st primo-ppcg 🇹🇭 824 143 25ms 25 Jun 2022 673rd MeWhenI 🇻🇦 823 53 151ms 19 Sep 2021 673rd GrayJoKing 🇦🇺 823 53 79ms 20 Sep 2021 673rd sean-niemann 🇺🇸 823 53 148ms 20 Sep 2021 673rd scpchicken 🇵🇼 823 53 150ms 19 Dec 2022 673rd Steffan153 🇫🇮 823 53 160ms 27 Jan 2023 673rd DialFrost 🇸🇬 823 53 138ms 28 Jan 2023 673rd snoozingnewt 🇨🇦 823 53 143ms 1 Sep 2024 673rd fuzzylojik-golf 🇺🇸 823 53 99ms 15 Sep 2025 673rd blaztoma 🇱🇹 823 53 146ms 23 Nov 2025 682nd Waffle3z 823 58 92ms 19 Sep 2021 682nd emgordon154 823 58 38ms 12 Dec 2021 682nd jbbarth 🇫🇷 823 58 40ms 5 Nov 2022 685th Fishron 823 85 256ms 21 Oct 2021 685th aposteriorist 🇨🇦 823 85 20ms 6 Feb 2022 685th TFeld00 🇩🇰 823 85 363ms 22 Apr 2022 685th Ailko 🇧🇪 823 85 68ms 5 May 2022 685th tkr-sh 🇰🇵 823 85 20ms 17 May 2022 685th 051 🇸🇬 823 85 20ms 19 Aug 2022 685th trist224 🇫🇷 823 85 68ms 18 Oct 2022 685th Ripick 823 85 21ms 1 Feb 2023 685th jmerle 🇳🇱 823 85 298ms 16 Feb 2023 685th fkantelberg 823 85 21ms 7 Aug 2023 685th minhtrancccp 823 85 67ms 1 Nov 2023 685th wen1now 823 85 19ms 6 Nov 2023 685th elgan65536 🇺🇸 823 85 20ms 28 Nov 2023 685th stertooy 🇧🇪 823 85 21ms 14 Jun 2024 685th FranklinJiaChen 823 85 191ms 5 Aug 2024 685th keelimeguy 🇺🇸 823 85 232ms 17 May 2025 685th KasperKivimaeki 🇫🇮 823 85 20ms 2 Jul 2025 685th albanian-laundromat 823 85 21ms 20 Nov 2025 685th Lv0Sys 🇵🇱 823 85 19ms 5 Dec 2025 704th sean-niemann 🇺🇸 822 86 2,750ms 30 Oct 2024 705th jared-hughes 820 83 126ms 11 Sep 2023 706th Shanethegamer 🇺🇸 820 168 1,437ms 27 Mar 2025 707th AdrienHache 🇫🇷 819 94 433ms 2 Jun 2023 708th Yewzir 🇧🇪 818 107 39ms 14 Jan 2024 709th Shanethegamer 🇺🇸 817 101 436ms 13 Apr 2023 709th emgordon154 817 101 469ms 26 May 2025 711th snyderek 🇺🇸 817 116 62ms 6 Oct 2024 712th m-tkach 🇺🇦 817 120 27ms 18 Dec 2023 713th Mabeloid 🇳🇴 817 122 131ms 31 Oct 2025 713th CaedenHarper 🇨🇦 817 122 123ms 1 Dec 2025 713th elgan65536 🇺🇸 817 122 127ms 7 Feb 2026 716th kimbo 🇺🇸 815 146 295ms 12 Jan 2023 717th edsrzf 🇳🇿 814 88 11ms 7 Jun 2025 718th Shanethegamer 🇺🇸 814 100 125ms 19 Sep 2021 718th MichalMarsalek 🇨🇿 814 100 127ms 3 Mar 2022 720th snoozingnewt 🇨🇦 814 105 95ms 30 Sep 2025 First Prev 641–720 of 2,106 Next Last