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?
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 560th Steffan153 🇫🇮 851 90 40ms 12 Jan 2023 560th stefangimmillaro 851 90 40ms 26 Jan 2023 560th MeWhenI 🇻🇦 851 90 41ms 14 May 2023 560th DialFrost 🇸🇬 851 90 41ms 22 Oct 2024 565th janbehrens 🇩🇪 849 140 300ms 20 Sep 2021 566th ovs-code 🇩🇪 849 181 1,738ms 14 Sep 2025 566th jared-hughes 849 181 1,666ms 16 Sep 2025 566th MeWhenI 🇻🇦 849 181 1,677ms 7 Nov 2025 566th Yewzir 🇧🇪 849 181 1,936ms 14 Nov 2025 570th KatieLG 🇬🇧 848 79 666ms 16 Jan 2024 570th MeWhenI 🇻🇦 848 79 569ms 17 Jan 2024 570th duckyluuk 🇳🇱 848 79 606ms 20 Jun 2024 570th namelessiw 848 79 575ms 14 Jul 2024 570th lifthrasiir 🇰🇷 848 79 453ms 2 Dec 2024 570th dokutan 848 79 560ms 17 days ago 576th MeWhenI 🇻🇦 848 96 123ms 15 Nov 2022 577th stefangimmillaro 847 111 507ms 6 Oct 2025 577th kmathis22 847 111 379ms 20 Nov 2025 577th ethanlally 847 111 387ms 23 Nov 2025 577th dokutan 847 111 326ms 23 Nov 2025 577th snoozingnewt 🇨🇦 847 111 449ms 5 Dec 2025 582nd Irratix 🇳🇱 846 112 62ms 3 Jan 2022 583rd ovs-code 🇩🇪 846 190 18ms 9 Jul 2024 584th rucin93 🇵🇱 845 86 2ms 19 Nov 2025 585th Yewzir 🇧🇪 845 118 130ms 5 Feb 2024 586th MeWhenI 🇻🇦 845 163 1,459ms 28 Mar 2025 587th Steffan153 🇫🇮 844 89 18ms 3 Feb 2023 587th sisyphus-ppcg 🇦🇺 844 89 17ms 4 Feb 2023 587th edsrzf 🇳🇿 844 89 14ms 14 Nov 2025 590th itsjustfreekie 842 83 300ms 20 Sep 2021 590th neihousaigaai 842 83 20ms 3 Jan 2022 590th cesarm4 842 83 181ms 16 Apr 2022 590th nstearns96 🇬🇧 842 83 245ms 27 Jan 2023 590th randolchance 842 83 20ms 16 Feb 2023 590th galloj 🇨🇿 842 83 3,418ms 5 Mar 2023 590th yzhs 🇩🇪 842 83 236ms 23 Jun 2023 590th Yewzir 🇧🇪 842 83 231ms 8 Oct 2023 590th m42km 842 83 312ms 12 Oct 2023 590th solisolu 842 83 21ms 11 days ago 600th DialFrost 🇸🇬 842 98 496ms 16 Nov 2025 601st JOrE20 842 140 25ms 19 Feb 2026 602nd rak1507 🇬🇧 841 36 35ms 20 Sep 2021 603rd Steffan153 🇫🇮 841 73 224ms 15 Aug 2024 604th emplv 🇱🇻 841 78 39ms 19 Apr 2024 605th pardouin 🇫🇷 841 83 3ms 8 Oct 2024 605th LostSyntax21 🇬🇧 841 83 3ms 8 Jan 2025 607th Shanethegamer 🇺🇸 839 95 121ms 14 Oct 2022 607th emplv 🇱🇻 839 95 110ms 28 Oct 2022 607th Yewzir 🇧🇪 839 95 114ms 28 Mar 2024 610th edsrzf 🇳🇿 839 100 19ms 5 Jan 2025 611th MeWhenI 🇻🇦 839 113 62ms 29 Nov 2022 612th anter69 🇭🇺 838 57 39ms 30 Sep 2021 613th primo-ppcg 🇹🇭 838 91 2ms 23 Sep 2021 613th JayXon 🇺🇸 838 91 2ms 3 Oct 2021 613th Lydxn 🇨🇦 838 91 2ms 9 Apr 2022 613th btnlq 838 91 2ms 27 Dec 2022 613th FlyingPenguin223 838 91 2ms 5 Feb 2026 618th lynn 838 119 151ms 10 Mar 2022 618th ovs-code 🇩🇪 838 119 134ms 23 Jun 2023 618th mousetail 🇳🇱 838 119 146ms 15 Jan 2024 621st ovs-code 🇩🇪 837 69 162ms 3 Aug 2024 622nd SirBogman 🇺🇸 837 80 585ms 15 Jan 2024 622nd Shanethegamer 🇺🇸 837 80 483ms 16 Jan 2024 622nd snoozingnewt 🇨🇦 837 80 643ms 28 Sep 2025 625th DialFrost 🇸🇬 836 88 8ms 26 Feb 2026 626th Shanethegamer 🇺🇸 836 95 137ms 16 Dec 2022 627th Shanethegamer 🇺🇸 836 102 1,325ms 20 Mar 2023 628th Yewzir 🇧🇪 835 87 2ms 20 Nov 2025 629th stackofbears 834 99 443ms 21 Mar 2022 630th CornerMercury 🇬🇧 833 30 5ms 21 Jan 2026 630th emgordon154 833 30 5ms 22 Feb 2026 632nd albanian-laundromat 833 105 43ms 7 Sep 2025 633rd Bonjour27891 🇻🇳 832 84 66ms 9 Feb 2022 633rd RDShah 832 84 331ms 11 May 2022 633rd fredrik-bakke 🇳🇴 832 84 304ms 2 Oct 2022 633rd jakobkordez 🇸🇮 832 84 19ms 30 Oct 2022 633rd thehylian 832 84 20ms 2 Jan 2023 633rd badboj40 832 84 306ms 12 Feb 2023 633rd firegene 🇮🇪 832 84 21ms 22 Dec 2023 633rd moustave 832 84 178ms 26 Nov 2024 First Prev 561–640 of 2,106 Next Last