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 32nd Emutis 🇱🇹 980 62 11ms 16 Nov 2025 32nd HPWiz 🇳🇿 980 62 10ms 26 Nov 2025 32nd snoozingnewt 🇨🇦 980 62 9ms 28 Nov 2025 32nd sunleonid 980 62 10ms 4 Dec 2025 32nd CaedenHarper 🇨🇦 980 62 9ms 4 Dec 2025 32nd ryyyn 🇺🇸 980 62 9ms 4 Dec 2025 32nd bizy-coder 980 62 10ms 5 Dec 2025 32nd KasperKivimaeki 🇫🇮 980 62 10ms 8 Dec 2025 32nd Flekay 🇩🇪 980 62 9ms 12 Feb 2026 32nd dokutan 980 62 9ms 17 Feb 2026 32nd FoxInTheClouds 980 62 10ms 19 Feb 2026 32nd aksyristos 980 62 10ms 64 mins ago 93rd JayXon 🇺🇸 967 62 12ms 26 Jan 2021 93rd emplv 🇱🇻 967 62 10ms 15 Dec 2021 93rd Lydxn 🇨🇦 967 62 12ms 12 Apr 2022 93rd Steffan153 🇫🇮 967 62 15ms 28 Jan 2023 93rd nwellnhof 🇩🇪 967 62 10ms 3 Mar 2023 93rd sean-niemann 🇺🇸 967 62 10ms 22 Feb 2024 93rd rucin93 🇵🇱 967 62 10ms 19 Apr 2024 93rd vlpx 🇫🇮 967 62 10ms 18 Jun 2024 93rd lukegustafson 🇺🇸 967 62 11ms 6 Sep 2024 102nd GrayJoKing 🇦🇺 965 39 143ms 17 Oct 2020 102nd Natanaelel 🇸🇪 965 39 129ms 2 days ago 104th sisyphus-ppcg 🇦🇺 963 49 36ms 6 Nov 2020 104th prplz 🇦🇺 963 49 40ms 6 Nov 2020 104th primo-ppcg 🇹🇭 963 49 39ms 15 Nov 2020 104th JayXon 🇺🇸 963 49 36ms 20 Feb 2021 104th GrayJoKing 🇦🇺 963 49 41ms 24 Mar 2021 104th Lydxn 🇨🇦 963 49 33ms 24 Mar 2021 104th nwellnhof 🇩🇪 963 49 33ms 6 Nov 2021 104th MeWhenI 🇻🇦 963 49 37ms 16 Feb 2022 104th stefangimmillaro 963 49 34ms 16 Feb 2022 104th radarek 🇵🇱 963 49 36ms 10 Mar 2022 104th lynn 963 49 35ms 25 May 2022 104th Steffan153 🇫🇮 963 49 34ms 28 Jan 2023 104th m-tkach 🇺🇦 963 49 38ms 23 Feb 2023 104th xsot 🇸🇬 963 49 34ms 14 Oct 2023 104th emgordon154 963 49 36ms 5 Aug 2024 104th sean-niemann 🇺🇸 963 49 36ms 9 Aug 2024 104th pardouin 🇫🇷 963 49 36ms 29 Sep 2024 104th DialFrost 🇸🇬 963 49 35ms 26 Dec 2024 104th snoozingnewt 🇨🇦 963 49 40ms 29 Nov 2025 123rd pardouin 🇫🇷 962 26 3ms 14 Apr 2025 124th sean-niemann 🇺🇸 959 27 46ms 22 Jul 2022 124th lynn 959 27 45ms 22 Jul 2022 124th MeWhenI 🇻🇦 959 27 46ms 23 Jul 2022 124th sisyphus-ppcg 🇦🇺 959 27 45ms 24 Jul 2022 124th jared-hughes 959 27 43ms 29 Jul 2022 124th primo-ppcg 🇹🇭 959 27 43ms 30 Sep 2022 124th DaCuteRaccoon 959 27 43ms 30 Nov 2022 124th AlephSquirrel 959 27 45ms 30 Dec 2022 124th DialFrost 🇸🇬 959 27 44ms 28 Jan 2023 124th CornerMercury 🇬🇧 959 27 43ms 24 Aug 2023 124th ovs-code 🇩🇪 959 27 169ms 2 Feb 2024 124th snoozingnewt 🇨🇦 959 27 43ms 1 Sep 2024 124th pardouin 🇫🇷 959 27 43ms 21 Sep 2024 124th LostSyntax21 🇬🇧 959 27 44ms 8 Jan 2025 124th edsrzf 🇳🇿 959 27 45ms 9 Mar 2025 124th CaedenHarper 🇨🇦 959 27 43ms 14 Jul 2025 124th fuzzylojik-golf 🇺🇸 959 27 43ms 9 Sep 2025 141st sisyphus-ppcg 🇦🇺 955 46 12ms 21 Dec 2023 142nd janbehrens 🇩🇪 952 52 260ms 26 Nov 2023 142nd Lydxn 🇨🇦 952 52 244ms 7 Jan 2024 142nd bitsandbeyond 🇳🇱 952 52 229ms 13 Jul 2024 145th dmrichwa 🇺🇸 952 63 10ms 28 Jan 2023 145th targrik 952 63 12ms 19 Feb 2025 147th saito-ta 🇯🇵 952 75 6ms 22 Jun 2022 147th Lydxn 🇨🇦 952 75 6ms 13 May 2023 147th rhdqor213 952 75 2ms 29 Jul 2024 147th KasperKivimaeki 🇫🇮 952 75 2ms 8 Nov 2025 151st Lydxn 🇨🇦 947 49 511ms 19 Nov 2021 151st rustyflamingo 947 49 530ms 22 Sep 2022 151st antimon2 🇯🇵 947 49 530ms 15 Oct 2022 151st JayXon 🇺🇸 947 49 514ms 3 Dec 2022 151st alemelis 947 49 502ms 1 Mar 2023 151st HPWiz 🇳🇿 947 49 514ms 9 Mar 2023 151st ovs-code 🇩🇪 947 49 530ms 24 Oct 2023 151st MarcMush 🇫🇷 947 49 490ms 5 Jan 2024 151st DialFrost 🇸🇬 947 49 527ms 5 Jan 2024 151st Steffan153 🇫🇮 947 49 534ms 28 Feb 2024 First Prev 81–160 of 3,221 Next Last