The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 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 634th roupiq 🇵🇱 892 80 1ms 9 Jun 2024 634th dokutan 892 80 2ms 17 days ago 643rd MeWhenI 🇻🇦 890 56 1,293ms 13 Nov 2022 644th GrayJoKing 🇦🇺 890 65 3ms 26 Jul 2023 645th stefangimmillaro 890 71 4ms 9 Jan 2022 645th emplv 🇱🇻 890 71 5ms 21 Jul 2022 647th Shanethegamer 🇺🇸 889 147 10ms 1 Aug 2023 647th MeWhenI 🇻🇦 889 147 9ms 1 Aug 2023 647th Lydxn 🇨🇦 889 147 10ms 1 Aug 2023 647th JayXon 🇺🇸 889 147 9ms 2 Aug 2023 647th Steffan153 🇫🇮 889 147 11ms 2 Aug 2023 647th janbehrens 🇩🇪 889 147 9ms 2 Aug 2023 647th GrayJoKing 🇦🇺 889 147 10ms 11 Aug 2023 647th BREMAUCY 🇫🇷 889 147 10ms 7 Sep 2023 647th dokutan 889 147 9ms 26 Oct 2023 647th Yewzir 🇧🇪 889 147 10ms 12 Mar 2024 647th HumanoidCPU 889 147 10ms 13 May 2024 647th pardouin 🇫🇷 889 147 9ms 20 Aug 2024 647th KatieLG 🇬🇧 889 147 10ms 26 Sep 2024 647th emgordon154 889 147 9ms 4 Dec 2024 647th CaedenHarper 🇨🇦 889 147 9ms 24 Jan 2025 647th rucin93 🇵🇱 889 147 10ms 23 Apr 2025 647th albanian-laundromat 889 147 10ms 20 Jul 2025 647th Babafaba 889 147 10ms 24 Oct 2025 647th GolfingSuccess 🇬🇷 889 147 10ms 8 Nov 2025 647th snoozingnewt 🇨🇦 889 147 10ms 5 Dec 2025 667th ovs-code 🇩🇪 887 87 488ms 29 Jul 2024 668th MeWhenI 🇻🇦 886 76 37ms 16 May 2023 669th Shanethegamer 🇺🇸 886 83 364ms 12 May 2023 669th janbehrens 🇩🇪 886 83 382ms 26 Nov 2023 669th Yewzir 🇧🇪 886 83 372ms 11 Feb 2024 669th snoozingnewt 🇨🇦 886 83 403ms 29 Nov 2025 673rd lynn 886 93 27ms 12 Jul 2023 673rd edsrzf 🇳🇿 886 93 27ms 24 Feb 2026 675th MeWhenI 🇻🇦 885 52 66ms 2 Nov 2023 675th Yewzir 🇧🇪 885 52 67ms 7 Mar 2024 675th edsrzf 🇳🇿 885 52 63ms 17 Jan 2025 675th fuzzylojik-golf 🇺🇸 885 52 60ms 17 Sep 2025 679th KasperKivimaeki 🇫🇮 885 115 284ms 2 Oct 2025 680th Steffan153 🇫🇮 884 64 122ms 26 Feb 2026 681st jared-hughes 884 76 1ms 6 Mar 2022 681st edsrzf 🇳🇿 884 76 2ms 7 days ago 683rd emplv 🇱🇻 884 93 25ms 29 Jun 2022 684th pardouin 🇫🇷 883 63 795ms 29 Aug 2025 685th MeWhenI 🇻🇦 883 75 2ms 12 Sep 2022 685th sean-niemann 🇺🇸 883 75 2ms 8 Oct 2024 687th marcin7Cd 883 77 136ms 11 Mar 2020 687th fuzzylojik-golf 🇺🇸 883 77 139ms 15 Sep 2025 689th marcin7Cd 883 148 10ms 12 Oct 2020 689th Attero 🇸🇪 883 148 9ms 12 Oct 2020 689th sisyphus-ppcg 🇦🇺 883 148 10ms 30 May 2021 689th lynn 883 148 10ms 1 Jun 2021 689th SirBogman 🇺🇸 883 148 10ms 28 Nov 2021 689th ovs-code 🇩🇪 883 148 10ms 22 Apr 2022 689th scpchicken 🇵🇼 883 148 10ms 4 Feb 2023 696th prplz 🇦🇺 882 68 10ms 12 Oct 2021 696th NewDefectus 🇮🇱 882 68 10ms 16 Dec 2021 696th KrausRaus 🇺🇸 882 68 12ms 6 Jan 2026 699th m-tkach 🇺🇦 882 98 53ms 9 Mar 2023 699th annaproxy 882 98 54ms 22 Oct 2023 699th Yewzir 🇧🇪 882 98 59ms 30 Dec 2023 702nd JayXon 🇺🇸 882 143 1,685ms 15 Sep 2025 703rd Attero 🇸🇪 881 81 2ms 4 May 2020 703rd c0d3-4-F00d 🇩🇪 881 81 2ms 5 Jan 2022 703rd snoozingnewt 🇨🇦 881 81 2ms 13 Sep 2025 703rd AZTECCO 881 81 2ms 16 Sep 2025 703rd Yax42 🇫🇷 881 81 1ms 14 Oct 2025 708th benwilliamgraham 880 69 10ms 26 Jan 2019 708th OllieBoyne 🇬🇧 880 69 9ms 16 Jan 2021 708th eiburns 880 69 10ms 20 Jan 2022 708th vishwathg 880 69 9ms 16 Aug 2022 708th emirps 880 69 9ms 22 Feb 2023 708th Vaekor 880 69 9ms 9 Jul 2023 708th AVDestroyer 880 69 10ms 4 Sep 2023 708th m42km 880 69 9ms 7 Oct 2023 708th elgan65536 🇺🇸 880 69 9ms 4 Apr 2024 708th JOrE20 880 69 9ms 25 Feb 2026 718th Yewzir 🇧🇪 880 79 115ms 6 Dec 2023 719th primo-ppcg 🇹🇭 879 50 30ms 11 Oct 2020 719th o0lit3 🇺🇸 879 50 13ms 19 Apr 2021 First Prev 641–720 of 3,221 Next Last
