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 881st snoozingnewt 🇨🇦 839 80 1ms 29 Nov 2025 882nd MeWhenI 🇻🇦 839 92 458ms 10 Oct 2022 883rd Yewzir 🇧🇪 838 79 2ms 22 Dec 2023 883rd albanian-laundromat 838 79 2ms 24 Jun 2025 885th edsrzf 🇳🇿 838 97 128ms 4 Mar 2025 886th SirFireball3521 836 45 150ms 22 Mar 2023 887th GrayJoKing 🇦🇺 836 80 100ms 15 Jul 2023 888th snoozingnewt 🇨🇦 835 84 3ms 9 Dec 2025 889th Shanethegamer 🇺🇸 833 30 3ms 13 Jan 2022 890th PatrickStephansen 🇿🇦 833 72 13ms 3 Nov 2020 890th KatieLG 🇬🇧 833 72 11ms 16 Apr 2021 890th neihousaigaai 833 72 14ms 18 Apr 2021 890th two-bad 🇬🇧 833 72 11ms 25 Feb 2024 894th mogron 832 73 10ms 13 Dec 2019 894th FlorianCassayre 🇫🇷 832 73 9ms 30 Oct 2022 894th StefanHabel 🇨🇦 832 73 9ms 11 Dec 2022 894th duckyluuk 🇳🇱 832 73 4ms 16 Dec 2024 894th DrakeSeteraO 832 73 10ms 25 Oct 2025 899th acacopardo 831 76 15ms 14 Nov 2017 899th MeWhenI 🇻🇦 831 76 14ms 15 Sep 2021 899th DaCuteRaccoon 831 76 14ms 30 Nov 2022 902nd marshallward 🇺🇸 831 81 39ms 2 Sep 2022 903rd primo-ppcg 🇹🇭 830 67 143ms 25 Dec 2020 903rd lynn 830 67 139ms 18 May 2021 903rd Yewzir 🇧🇪 830 67 146ms 17 Sep 2023 903rd sean-niemann 🇺🇸 830 67 143ms 8 Oct 2024 907th djeedjay 🇳🇱 830 86 1ms 26 Oct 2020 907th Yewzir 🇧🇪 830 86 1ms 22 Dec 2023 909th fuzzylojik-golf 🇺🇸 830 93 458ms 30 Aug 2025 910th kgodara 830 98 133ms 11 Mar 2023 911th GrayJoKing 🇦🇺 829 53 21ms 10 Apr 2021 911th scpchicken 🇵🇼 829 53 40ms 23 May 2021 911th kurkale6ka 829 53 21ms 16 Jun 2021 911th sean-niemann 🇺🇸 829 53 47ms 7 Sep 2021 911th MeWhenI 🇻🇦 829 53 36ms 15 Sep 2021 911th DaCuteRaccoon 829 53 34ms 30 Nov 2022 911th Steffan153 🇫🇮 829 53 33ms 28 Jan 2023 911th DialFrost 🇸🇬 829 53 32ms 28 Jan 2023 911th snoozingnewt 🇨🇦 829 53 33ms 1 Sep 2024 911th LostSyntax21 🇬🇧 829 53 31ms 8 Jan 2025 911th fuzzylojik-golf 🇺🇸 829 53 19ms 15 Sep 2025 922nd jared-hughes 829 82 116ms 11 Sep 2023 923rd edsrzf 🇳🇿 829 108 3ms 14 days ago 924th anter69 🇭🇺 828 57 34ms 3 Aug 2021 924th annaproxy 828 57 34ms 27 Aug 2022 924th BREMAUCY 🇫🇷 828 57 34ms 26 Mar 2024 924th dokutan 828 57 33ms 16 days ago 928th inventshah 827 80 2ms 9 Sep 2022 929th Shanethegamer 🇺🇸 826 64 3ms 25 Apr 2023 930th m-tkach 🇺🇦 825 64 381ms 30 Jan 2024 931st GolfingSuccess 🇬🇷 825 74 7ms 24 Feb 2026 932nd ovs-code 🇩🇪 824 153 1,750ms 14 Sep 2025 932nd primo-ppcg 🇹🇭 824 153 1,708ms 15 Sep 2025 932nd emgordon154 824 153 1,662ms 16 Sep 2025 932nd Yewzir 🇧🇪 824 153 1,881ms 14 Nov 2025 936th didion0 🇺🇸 822 73 17ms 22 Apr 2021 936th itsh01 822 73 14ms 16 Aug 2021 936th c0d3-4-F00d 🇩🇪 822 73 11ms 5 Jan 2022 936th DaCuteRaccoon 822 73 13ms 30 Nov 2022 936th janbehrens 🇩🇪 822 73 11ms 17 Jun 2023 936th Yax42 🇫🇷 822 73 11ms 12 Nov 2025 942nd snoozingnewt 🇨🇦 822 74 2,669ms 29 Nov 2025 943rd KatieLG 🇬🇧 821 74 16ms 5 Nov 2020 943rd trist224 🇫🇷 821 74 9ms 15 Nov 2022 943rd QuincyNash 🇺🇸 821 74 9ms 29 Nov 2022 946th AaronGarbut 821 87 1ms 30 Jul 2019 947th MeWhenI 🇻🇦 820 98 38ms 28 Aug 2024 948th jared-hughes 819 154 1,691ms 16 Sep 2025 948th MeWhenI 🇻🇦 819 154 1,642ms 7 Nov 2025 950th phdphil 818 46 154ms 9 Apr 2018 951st snoozingnewt 🇨🇦 818 68 144ms 29 Nov 2025 952nd dokutan 818 85 123ms 23 Jul 2025 953rd orthoplex 🇨🇽 817 36 35ms 20 Jul 2024 954th Frank-Buss 817 93 5ms 29 Aug 2020 955th MeWhenI 🇻🇦 815 71 3ms 25 Jul 2023 956th NewDefectus 🇮🇱 814 54 15ms 15 Dec 2021 957th Waffle3z 814 58 38ms 20 Jan 2021 957th jbbarth 🇫🇷 814 58 34ms 8 Oct 2021 957th AlephSquirrel 814 58 44ms 14 Apr 2023 957th SirBogman 🇺🇸 814 58 33ms 10 Jan 2024 First Prev 881–960 of 3,221 Next Last