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 239th lynn 935 87 120ms 7 Jul 2024 239th DialFrost 🇸🇬 935 87 127ms 4 Apr 2025 239th acotis 935 87 116ms 15 Apr 2025 239th emgordon154 935 87 117ms 18 Apr 2025 239th ovs-code 🇩🇪 935 87 124ms 20 Apr 2025 239th pardouin 🇫🇷 935 87 117ms 20 Apr 2025 239th stefangimmillaro 935 87 128ms 18 May 2025 239th sean-niemann 🇺🇸 935 87 124ms 6 Jun 2025 239th kumavale 935 87 117ms 17 Aug 2025 239th Steffan153 🇫🇮 935 87 127ms 16 Feb 2026 251st primo-ppcg 🇹🇭 934 53 286ms 20 Oct 2020 251st prplz 🇦🇺 934 53 262ms 20 Oct 2020 251st btnlq 934 53 278ms 13 Dec 2020 251st JayXon 🇺🇸 934 53 296ms 28 Jun 2021 251st nwellnhof 🇩🇪 934 53 243ms 27 Dec 2021 251st sisyphus-ppcg 🇦🇺 934 53 253ms 15 Aug 2022 251st stefangimmillaro 934 53 247ms 22 Aug 2022 251st MeWhenI 🇻🇦 934 53 256ms 29 Jan 2023 251st Steffan153 🇫🇮 934 53 257ms 29 Jan 2023 251st SirBogman 🇺🇸 934 53 233ms 8 Jan 2024 251st DialFrost 🇸🇬 934 53 252ms 26 Dec 2024 251st sean-niemann 🇺🇸 934 53 248ms 6 Apr 2025 263rd JayXon 🇺🇸 933 72 1ms 9 Jul 2021 263rd Lydxn 🇨🇦 933 72 1ms 9 Jul 2021 263rd sisyphus-ppcg 🇦🇺 933 72 1ms 16 Mar 2022 263rd GrayJoKing 🇦🇺 933 72 1ms 9 Apr 2022 263rd btnlq 933 72 1ms 28 Dec 2022 263rd Steffan153 🇫🇮 933 72 2ms 26 Feb 2026 269th lyphyser 932 51 55ms 26 Dec 2023 269th AdrienHache 🇫🇷 932 51 53ms 29 Aug 2024 271st flawr 932 73 136ms 24 Feb 2019 271st GrayJoKing 🇦🇺 932 73 136ms 5 Dec 2020 271st Shanethegamer 🇺🇸 932 73 140ms 15 Jul 2021 271st yzhs 🇩🇪 932 73 140ms 24 Jul 2021 271st sean-niemann 🇺🇸 932 73 132ms 7 Sep 2021 271st MeWhenI 🇻🇦 932 73 139ms 15 Sep 2021 271st sisyphus-ppcg 🇦🇺 932 73 140ms 16 Mar 2022 271st Lydxn 🇨🇦 932 73 139ms 4 Jul 2022 271st DaCuteRaccoon 932 73 136ms 30 Nov 2022 271st DialFrost 🇸🇬 932 73 154ms 28 Jan 2023 271st Steffan153 🇫🇮 932 73 137ms 28 Jan 2023 271st scpchicken 🇵🇼 932 73 140ms 7 Mar 2023 271st pardouin 🇫🇷 932 73 159ms 21 Sep 2024 271st LostSyntax21 🇬🇧 932 73 152ms 8 Jan 2025 271st snoozingnewt 🇨🇦 932 73 148ms 5 Dec 2025 271st edsrzf 🇳🇿 932 73 153ms 24 Dec 2025 287th HPWiz 🇳🇿 931 53 1,059ms 18 Mar 2022 288th sean-niemann 🇺🇸 931 60 2ms 29 Oct 2022 288th Lydxn 🇨🇦 931 60 2ms 30 Oct 2022 288th sisyphus-ppcg 🇦🇺 931 60 2ms 3 Nov 2022 288th primo-ppcg 🇹🇭 931 60 4ms 19 Nov 2022 288th clockworknazo 931 60 4ms 19 Nov 2022 288th Steffan153 🇫🇮 931 60 2ms 28 Jan 2023 288th xsot 🇸🇬 931 60 2ms 25 Jul 2023 288th DialFrost 🇸🇬 931 60 4ms 14 Sep 2023 288th fuzzylojik-golf 🇺🇸 931 60 4ms 15 Sep 2025 288th canissimia 🇦🇶 931 60 2ms 16 Jan 2026 298th nwellnhof 🇩🇪 930 79 394ms 21 Nov 2021 299th JayXon 🇺🇸 930 93 49ms 2 Jan 2022 299th Lydxn 🇨🇦 930 93 57ms 2 Jan 2022 299th inventshah 930 93 60ms 22 Apr 2023 299th xsot 🇸🇬 930 93 57ms 23 May 2024 303rd JayXon 🇺🇸 929 72 238ms 18 Aug 2021 303rd Lydxn 🇨🇦 929 72 86ms 18 Aug 2021 303rd MeWhenI 🇻🇦 929 72 79ms 11 Mar 2022 303rd stefangimmillaro 929 72 83ms 28 Jul 2022 303rd Steffan153 🇫🇮 929 72 81ms 9 Aug 2024 303rd sean-niemann 🇺🇸 929 72 83ms 23 Dec 2024 309th MeWhenI 🇻🇦 928 54 3ms 12 Aug 2024 309th sisyphus-ppcg 🇦🇺 928 54 3ms 12 Aug 2024 309th Steffan153 🇫🇮 928 54 3ms 12 Aug 2024 309th btnlq 928 54 3ms 14 Aug 2024 309th DialFrost 🇸🇬 928 54 4ms 15 Aug 2024 309th ovs-code 🇩🇪 928 54 3ms 15 Aug 2024 309th Shanethegamer 🇺🇸 928 54 3ms 15 Aug 2024 309th GrayJoKing 🇦🇺 928 54 3ms 17 Aug 2024 309th emgordon154 928 54 3ms 19 Aug 2024 309th pardouin 🇫🇷 928 54 3ms 6 Sep 2024 309th sean-niemann 🇺🇸 928 54 3ms 13 Jan 2025 309th snoozingnewt 🇨🇦 928 54 3ms 30 Nov 2025 First Prev 241–320 of 3,218 Next Last