The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 38 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 240th rak1507 🇬🇧 907 75 149ms 23 Feb 2022 240th alomiF 907 75 148ms 5 Oct 2023 240th Natanaelel 🇸🇪 907 75 143ms 8 May 2025 244th JayXon 🇺🇸 907 77 22ms 26 Nov 2021 244th ovs-code 🇩🇪 907 77 4ms 4 Nov 2023 246th primo-ppcg 🇹🇭 907 79 14ms 20 May 2023 246th kg583 🇺🇸 907 79 22ms 10 hours ago 248th JayXon 🇺🇸 907 91 460ms 6 Mar 2022 249th JayXon 🇺🇸 906 78 2,630ms 5 Dec 2024 250th Lydxn 🇨🇦 906 88 131ms 9 Apr 2023 250th JayXon 🇺🇸 906 88 117ms 9 Apr 2023 250th Steffan153 🇫🇮 906 88 112ms 9 Apr 2023 250th sean-niemann 🇺🇸 906 88 114ms 25 May 2025 254th edsrzf 🇳🇿 905 67 1,086ms 23 days ago 254th Steffan153 🇫🇮 905 67 833ms 23 days ago 256th JayXon 🇺🇸 905 74 562ms 25 Jan 2024 256th kg583 🇺🇸 905 74 538ms 15 Oct 2025 258th clockworknazo 905 83 13ms 13 Oct 2022 258th ovs-code 🇩🇪 905 83 13ms 7 Feb 2023 258th Lydxn 🇨🇦 905 83 13ms 28 Feb 2023 258th GrayJoKing 🇦🇺 905 83 18ms 2 Mar 2023 262nd btnlq 905 84 20ms 9 Dec 2021 262nd GrayJoKing 🇦🇺 905 84 36ms 9 Dec 2021 264th Lydxn 🇨🇦 905 90 403ms 14 Aug 2022 265th DialFrost 🇸🇬 904 104 366ms 16 Nov 2025 266th DialFrost 🇸🇬 903 68 195ms 2 Jul 2025 267th Lydxn 🇨🇦 903 88 3,353ms 22 Mar 2023 268th anter69 🇭🇺 902 55 1,372ms 10 Mar 2025 269th rucin93 🇵🇱 902 64 148ms 6 Sep 2024 270th kg583 🇺🇸 902 93 16ms 28 Oct 2025 270th Steffan153 🇫🇮 902 93 21ms 17 days ago 272nd GrayJoKing 🇦🇺 902 97 40ms 23 Oct 2023 273rd nwellnhof 🇩🇪 901 53 73ms 26 Dec 2021 274th primo-ppcg 🇹🇭 901 85 39ms 22 Sep 2021 274th cure-honey 🇯🇵 901 85 39ms 27 Sep 2021 274th marshallward 🇺🇸 901 85 41ms 2 Sep 2022 277th bastatom 901 132 281ms 27 Feb 2024 277th emgordon154 901 132 294ms 17 Jan 2025 279th JayXon 🇺🇸 900 95 127ms 27 Sep 2021 279th Lydxn 🇨🇦 900 95 133ms 16 May 2023 281st primo-ppcg 🇹🇭 900 110 439ms 22 Sep 2021 282nd MeWhenI 🇻🇦 899 66 11ms 19 Sep 2021 282nd sisyphus-ppcg 🇦🇺 899 66 13ms 20 Sep 2021 282nd Irratix 🇳🇱 899 66 11ms 15 Dec 2021 282nd DialFrost 🇸🇬 899 66 11ms 28 Jan 2023 282nd Argeento 🇵🇱 899 66 11ms 26 Aug 2023 282nd Lv0Sys 🇵🇱 899 66 14ms 28 Feb 2026 288th btnlq 898 59 3ms 5 Nov 2022 289th GrayJoKing 🇦🇺 898 90 537ms 10 Sep 2022 290th dvargas46 🇺🇸 897 56 294ms 15 Nov 2022 291st GolfingSuccess 🇬🇷 897 81 2ms 19 Mar 2025 291st sean-niemann 🇺🇸 897 81 2ms 19 Nov 2025 291st Steffan153 🇫🇮 897 81 2ms 13 Feb 2026 294th Lydxn 🇨🇦 897 89 152ms 4 Sep 2023 295th Lydxn 🇨🇦 897 92 453ms 9 Apr 2023 295th sean-niemann 🇺🇸 897 92 438ms 16 May 2024 295th Steffan153 🇫🇮 897 92 470ms 21 Jul 2024 298th typeswitch-dev 🇵🇹 897 94 4ms 2 Aug 2023 299th ahmetdemirag 🇨🇾 896 78 156ms 11 Feb 2025 300th Lydxn 🇨🇦 896 80 10ms 20 May 2023 300th GrayJoKing 🇦🇺 896 80 13ms 13 Aug 2023 300th btnlq 896 80 13ms 22 Oct 2023 300th Steffan153 🇫🇮 896 80 13ms 20 Feb 2026 304th prplz 🇦🇺 895 76 165ms 27 Sep 2021 304th YAJUE114514 895 76 153ms 30 Jul 2025 306th DialFrost 🇸🇬 895 78 7ms 17 Dec 2024 306th sean-niemann 🇺🇸 895 78 8ms 6 Feb 2026 308th JayXon 🇺🇸 895 91 125ms 4 Nov 2021 308th primo-ppcg 🇹🇭 895 91 128ms 2 Apr 2022 308th Ripick 895 91 121ms 1 Feb 2023 311th KasperKivimaeki 🇫🇮 895 105 410ms 12 Dec 2025 312th KasperKivimaeki 🇫🇮 894 106 65ms 12 Dec 2025 313th AlephSquirrel 893 28 3ms 3 Nov 2025 314th m-tkach 🇺🇦 893 75 458ms 20 Jan 2024 314th emgordon154 893 75 541ms 16 Apr 2025 316th JayXon 🇺🇸 893 89 2,901ms 19 Jul 2025 317th DialFrost 🇸🇬 893 94 40ms 5 Jan 2026 317th error256 893 94 29ms 16 days ago 319th error256 893 132 25ms 16 days ago 320th sean-niemann 🇺🇸 892 68 1,070ms 15 Sep 2025 First Prev 241–320 of 2,106 Next Last