The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
Happy 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 633rd dokutan 892 80 2ms 13 days ago 642nd MeWhenI 🇻🇦 890 56 1,293ms 13 Nov 2022 643rd stefangimmillaro 890 71 4ms 9 Jan 2022 643rd emplv 🇱🇻 890 71 5ms 21 Jul 2022 645th GrayJoKing 🇦🇺 889 65 3ms 26 Jul 2023 646th Shanethegamer 🇺🇸 889 147 10ms 1 Aug 2023 646th MeWhenI 🇻🇦 889 147 9ms 1 Aug 2023 646th Lydxn 🇨🇦 889 147 10ms 1 Aug 2023 646th JayXon 🇺🇸 889 147 9ms 2 Aug 2023 646th Steffan153 🇫🇮 889 147 11ms 2 Aug 2023 646th janbehrens 🇩🇪 889 147 9ms 2 Aug 2023 646th GrayJoKing 🇦🇺 889 147 10ms 11 Aug 2023 646th BREMAUCY 🇫🇷 889 147 10ms 7 Sep 2023 646th dokutan 889 147 9ms 26 Oct 2023 646th Yewzir 🇧🇪 889 147 10ms 12 Mar 2024 646th HumanoidCPU 889 147 10ms 13 May 2024 646th pardouin 🇫🇷 889 147 9ms 20 Aug 2024 646th KatieLG 🇬🇧 889 147 10ms 26 Sep 2024 646th emgordon154 889 147 9ms 4 Dec 2024 646th CaedenHarper 🇨🇦 889 147 9ms 24 Jan 2025 646th rucin93 🇵🇱 889 147 10ms 23 Apr 2025 646th albanian-laundromat 889 147 10ms 20 Jul 2025 646th Babafaba 889 147 10ms 24 Oct 2025 646th GolfingSuccess 🇬🇷 889 147 10ms 8 Nov 2025 646th snoozingnewt 🇨🇦 889 147 10ms 5 Dec 2025 666th ovs-code 🇩🇪 887 87 488ms 29 Jul 2024 667th MeWhenI 🇻🇦 886 76 37ms 16 May 2023 668th Shanethegamer 🇺🇸 886 83 364ms 12 May 2023 668th janbehrens 🇩🇪 886 83 382ms 26 Nov 2023 668th Yewzir 🇧🇪 886 83 372ms 11 Feb 2024 668th snoozingnewt 🇨🇦 886 83 403ms 29 Nov 2025 672nd lynn 886 93 27ms 12 Jul 2023 672nd edsrzf 🇳🇿 886 93 27ms 24 Feb 2026 674th MeWhenI 🇻🇦 885 52 66ms 2 Nov 2023 674th Yewzir 🇧🇪 885 52 67ms 7 Mar 2024 674th edsrzf 🇳🇿 885 52 63ms 17 Jan 2025 674th fuzzylojik-golf 🇺🇸 885 52 60ms 17 Sep 2025 678th KasperKivimaeki 🇫🇮 885 115 284ms 2 Oct 2025 679th Steffan153 🇫🇮 884 64 122ms 27 days ago 680th jared-hughes 884 76 1ms 6 Mar 2022 680th edsrzf 🇳🇿 884 76 2ms 4 days ago 682nd emplv 🇱🇻 884 93 25ms 29 Jun 2022 683rd pardouin 🇫🇷 883 63 795ms 29 Aug 2025 684th MeWhenI 🇻🇦 883 75 2ms 12 Sep 2022 684th sean-niemann 🇺🇸 883 75 2ms 8 Oct 2024 686th marcin7Cd 883 77 136ms 11 Mar 2020 686th fuzzylojik-golf 🇺🇸 883 77 139ms 15 Sep 2025 688th marcin7Cd 883 148 10ms 12 Oct 2020 688th Attero 🇸🇪 883 148 9ms 12 Oct 2020 688th sisyphus-ppcg 🇦🇺 883 148 10ms 30 May 2021 688th lynn 883 148 10ms 1 Jun 2021 688th SirBogman 🇺🇸 883 148 10ms 28 Nov 2021 688th ovs-code 🇩🇪 883 148 10ms 22 Apr 2022 688th scpchicken 🇵🇼 883 148 10ms 4 Feb 2023 695th prplz 🇦🇺 882 68 10ms 12 Oct 2021 695th NewDefectus 🇮🇱 882 68 10ms 16 Dec 2021 695th KrausRaus 🇺🇸 882 68 12ms 6 Jan 2026 698th m-tkach 🇺🇦 882 98 53ms 9 Mar 2023 698th annaproxy 882 98 54ms 22 Oct 2023 698th Yewzir 🇧🇪 882 98 59ms 30 Dec 2023 701st JayXon 🇺🇸 882 143 1,685ms 15 Sep 2025 702nd Attero 🇸🇪 881 81 2ms 4 May 2020 702nd c0d3-4-F00d 🇩🇪 881 81 2ms 5 Jan 2022 702nd snoozingnewt 🇨🇦 881 81 2ms 13 Sep 2025 702nd AZTECCO 881 81 2ms 16 Sep 2025 702nd Yax42 🇫🇷 881 81 1ms 14 Oct 2025 707th benwilliamgraham 880 69 10ms 26 Jan 2019 707th OllieBoyne 🇬🇧 880 69 9ms 16 Jan 2021 707th eiburns 880 69 10ms 20 Jan 2022 707th vishwathg 880 69 9ms 16 Aug 2022 707th emirps 880 69 9ms 22 Feb 2023 707th Vaekor 880 69 9ms 9 Jul 2023 707th AVDestroyer 880 69 10ms 4 Sep 2023 707th m42km 880 69 9ms 7 Oct 2023 707th elgan65536 🇺🇸 880 69 9ms 4 Apr 2024 707th JOrE20 880 69 9ms 25 Feb 2026 717th Yewzir 🇧🇪 880 79 115ms 6 Dec 2023 718th primo-ppcg 🇹🇭 879 50 30ms 11 Oct 2020 718th o0lit3 🇺🇸 879 50 13ms 19 Apr 2021 718th armin-k1 879 50 8ms 8 Sep 2021 First Prev 641–720 of 3,218 Next Last
