The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?
Happy Numbers (Long) in all languages in chars. 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 Chars Time Submitted 721st DialFrost 🇸🇬 758 112 41ms 13 Feb 2025 722nd Shanethegamer 🇺🇸 757 93 2,780ms 27 Oct 2024 723rd prplz 🇦🇺 755 91 2ms 19 Dec 2021 723rd Irratix 🇳🇱 755 91 2ms 13 Jun 2022 725th jared-hughes 755 123 503ms 24 Sep 2025 726th Irratix 🇳🇱 754 90 141ms 24 Sep 2021 727th Yewzir 🇧🇪 753 99 40ms 18 Dec 2024 728th jared-hughes 753 101 2ms 17 Mar 2022 729th gnuvince 751 33 36ms 2 Aug 2024 729th codereport 🇨🇦 751 33 6ms 21 Apr 2025 731st OllieBoyne 🇬🇧 751 79 173ms 25 May 2022 731st 5cw 🇺🇸 751 79 314ms 8 May 2024 731st bzijlema 🇳🇱 751 79 314ms 11 Oct 2024 731st jipsong 🇩🇪 751 79 223ms 20 Jun 2025 731st InigoK 🇺🇸 751 79 173ms 5 Sep 2025 731st fuzzylojik-golf 🇺🇸 751 79 181ms 15 Sep 2025 737th MeWhenI 🇻🇦 751 95 15ms 23 May 2023 738th prplz 🇦🇺 750 66 1,443ms 27 Sep 2021 738th DialFrost 🇸🇬 750 66 686ms 10 Oct 2024 740th trist224 🇫🇷 750 126 436ms 15 Nov 2022 741st prplz 🇦🇺 749 55 40ms 18 Dec 2021 741st lynn 749 55 69ms 25 May 2022 741st anter69 🇭🇺 749 55 39ms 25 Jan 2023 741st ovs-code 🇩🇪 749 55 66ms 9 May 2023 741st Natanaelel 🇸🇪 749 55 36ms 10 May 2023 746th alasdair-greenland 749 79 26ms 10 Nov 2021 746th igmcdowell 749 79 11ms 11 Dec 2021 746th dylanarmstrong 749 79 14ms 24 Jan 2024 749th KasperKivimaeki 🇫🇮 749 157 29ms 19 Feb 2026 750th yzhs 🇩🇪 748 66 1,305ms 5 Nov 2021 751st Yewzir 🇧🇪 748 110 442ms 13 Jan 2024 752nd m-tkach 🇺🇦 747 75 458ms 20 Jan 2024 753rd solisolu 747 92 2ms 9 days ago 754th KrausRaus 🇺🇸 746 97 2ms 24 Oct 2023 755th Shanethegamer 🇺🇸 746 102 2ms 12 Dec 2022 755th dokutan 746 102 3ms 6 Nov 2025 757th 386asm 🇺🇸 746 117 40ms 10 Apr 2023 758th Shanethegamer 🇺🇸 746 131 28ms 20 Mar 2023 759th sisyphus-ppcg 🇦🇺 744 89 17ms 4 Feb 2023 759th edsrzf 🇳🇿 744 89 14ms 14 Nov 2025 761st Yewzir 🇧🇪 744 102 366ms 13 Jan 2024 762nd albanian-laundromat 744 113 4ms 10 Dec 2025 763rd o0lit3 🇺🇸 743 50 78ms 19 Sep 2021 763rd primo-ppcg 🇹🇭 743 50 139ms 20 Sep 2021 763rd nwellnhof 🇩🇪 743 50 62ms 26 Dec 2021 763rd Lydxn 🇨🇦 743 50 163ms 25 May 2022 767th emgordon154 742 31 320ms 10 Sep 2025 768th primo-ppcg 🇹🇭 742 80 283ms 22 Sep 2021 768th prplz 🇦🇺 742 80 220ms 18 Dec 2021 768th inventshah 742 80 305ms 10 May 2022 768th jhu04 742 80 313ms 18 Jan 2024 768th jtaxen 742 80 303ms 4 Apr 2024 768th namelessiw 742 80 216ms 14 Jul 2024 768th fgrosshans 🇫🇷 742 80 307ms 23 Jul 2024 768th EnTerr 742 80 195ms 8 Sep 2024 768th zacjl 742 80 24ms 12 Apr 2025 768th 77Tigers 742 80 229ms 13 Jan 2026 778th Lv0Sys 🇵🇱 741 111 439ms 27 days ago 779th itsh01 740 80 43ms 4 Oct 2021 779th voytxt 🇨🇿 740 80 12ms 2 Mar 2022 779th dokutan 740 80 23ms 24 Dec 2024 782nd Shanethegamer 🇺🇸 739 93 2ms 3 Apr 2023 782nd Yewzir 🇧🇪 739 93 2ms 10 Jan 2024 784th jared-hughes 739 128 71ms 20 Jul 2022 784th Alex-x90 🇺🇸 739 128 62ms 14 Nov 2022 786th GrayJoKing 🇦🇺 738 72 162ms 3 Aug 2024 786th emgordon154 738 72 163ms 15 Nov 2024 788th snoozingnewt 🇨🇦 738 102 155ms 13 Sep 2025 789th KatieLG 🇬🇧 737 67 1,208ms 21 Sep 2021 790th AlephSquirrel 737 76 543ms 16 Jan 2024 790th JunkIce 737 76 425ms 3 Dec 2024 792nd boxjelly 737 92 164ms 14 Mar 2022 793rd Matgc04 737 103 362ms 22 Aug 2023 793rd steffan-polygolf 737 103 127ms 19 Feb 2024 793rd dokutan 737 103 450ms 23 Nov 2025 796th akshatj27 🇦🇶 736 56 37ms 11 Jan 2022 796th m-tkach 🇺🇦 736 56 37ms 23 Feb 2023 798th snoozingnewt 🇨🇦 736 90 163ms 13 Oct 2025 799th Shanethegamer 🇺🇸 734 89 42ms 16 Apr 2024 800th SirBogman 🇺🇸 734 254 43ms 23 Nov 2022 First Prev 721–800 of 2,088 Next Last