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 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 641st emplv 🇱🇻 795 148 24ms 29 Jun 2022 642nd dokutan 794 67 229ms 4 Feb 2025 643rd Alessandro-Balconi 🇮🇹 794 77 96ms 14 Jul 2023 644th MeWhenI 🇻🇦 794 100 111ms 15 Oct 2022 645th error256 794 117 403ms 16 days ago 646th Shanethegamer 🇺🇸 793 29 80ms 22 Jul 2022 647th primo-ppcg 🇹🇭 793 61 1,387ms 9 Feb 2022 648th DialFrost 🇸🇬 793 63 245ms 21 Jan 2025 649th ovs-code 🇩🇪 793 66 10ms 15 Aug 2024 649th sisyphus-ppcg 🇦🇺 793 66 14ms 19 Aug 2024 651st MeWhenI 🇻🇦 793 110 39ms 17 Feb 2023 652nd sisyphus-ppcg 🇦🇺 792 96 15ms 7 Apr 2022 652nd DialFrost 🇸🇬 792 96 18ms 31 Oct 2024 652nd sean-niemann 🇺🇸 792 96 21ms 9 Apr 2025 652nd edsrzf 🇳🇿 792 96 12ms 26 Jul 2025 656th wh3n3v3r 🇨🇿 791 75 25ms 13 Nov 2024 657th MeWhenI 🇻🇦 791 96 123ms 15 Nov 2022 658th MeWhenI 🇻🇦 791 104 440ms 17 Aug 2023 659th LostSyntax21 🇬🇧 791 149 287ms 8 Jan 2025 660th albanian-laundromat 789 149 27ms 28 Dec 2025 661st Shanethegamer 🇺🇸 788 84 135ms 15 Jan 2023 662nd janbehrens 🇩🇪 788 120 66ms 20 Nov 2022 662nd oceko 788 120 71ms 19 Feb 2024 664th namelessiw 787 118 508ms 6 Oct 2025 665th fuzzylojik-golf 🇺🇸 785 107 4ms 2 days ago 666th mousetail 🇳🇱 784 54 19ms 15 Jan 2024 667th NickTheEASDude 🇺🇸 784 97 18ms 9 May 2024 668th Shanethegamer 🇺🇸 783 97 440ms 20 Jun 2022 668th Yax42 🇫🇷 783 97 462ms 7 Jan 2026 670th ian-h-chamberlain 🇺🇸 783 127 124ms 4 Dec 2025 671st JunkIce 781 76 23ms 3 Dec 2024 672nd NewDefectus 🇮🇱 781 88 2ms 16 Dec 2021 673rd Shanethegamer 🇺🇸 780 60 349ms 9 Mar 2023 674th dokutan 778 93 3ms 16 days ago 675th nwellnhof 🇩🇪 777 53 73ms 26 Dec 2021 676th frosster 🇨🇦 776 98 20ms 11 Feb 2026 677th aposteriorist 🇨🇦 776 106 452ms 5 Mar 2022 678th KenanSi 775 32 6ms 24 Feb 2022 678th ashtraypettingzoo 🇺🇸 775 32 6ms 5 Apr 2023 680th Re-Adventures 🇮🇳 775 122 69ms 14 Aug 2022 681st DialFrost 🇸🇬 774 104 9ms 20 days ago 682nd prplz 🇦🇺 772 64 1,317ms 20 Sep 2021 683rd ListeriaM 772 89 2ms 25 Aug 2023 684th ovs-code 🇩🇪 771 69 162ms 3 Aug 2024 685th DialFrost 🇸🇬 771 129 170ms 5 Apr 2025 686th SirBogman 🇺🇸 770 39 285ms 20 Sep 2021 686th yzhs 🇩🇪 770 39 36ms 21 Jun 2022 688th nwellnhof 🇩🇪 770 77 21ms 8 Aug 2022 688th bricknellj 770 77 176ms 20 Dec 2022 688th bob-th 770 77 166ms 24 Jan 2023 688th AlephSquirrel 770 77 258ms 27 Jan 2023 688th steffan-polygolf 770 77 12ms 8 Mar 2024 688th Bulmenisaurus 770 77 265ms 8 Oct 2024 688th ryyyn 🇺🇸 770 77 131ms 4 Dec 2025 695th ovs-code 🇩🇪 770 127 27ms 26 Dec 2022 696th jared-hughes 769 77 11ms 14 Mar 2022 696th Re-Adventures 🇮🇳 769 77 13ms 14 Aug 2022 696th lyphyser 769 77 11ms 3 Jun 2023 696th helbling 🇨🇭 769 77 14ms 4 Jul 2024 700th ovs-code 🇩🇪 768 73 925ms 15 Jan 2024 700th sisyphus-ppcg 🇦🇺 768 73 1,547ms 16 Jan 2024 700th bizy-coder 768 73 971ms 3 Oct 2024 703rd Shanethegamer 🇺🇸 768 93 14ms 8 Apr 2024 704th KatieLG 🇬🇧 768 111 182ms 14 Jan 2023 705th edsrzf 🇳🇿 766 99 19ms 5 Jan 2025 706th emgordon154 766 146 19ms 10 Jun 2025 707th snoozingnewt 🇨🇦 765 92 2,590ms 27 Sep 2025 708th DialFrost 🇸🇬 764 127 115ms 29 Nov 2025 708th emgordon154 764 127 126ms 4 Dec 2025 710th MeWhenI 🇻🇦 764 244 16ms 28 Aug 2023 711th MeWhenI 🇻🇦 763 54 40ms 16 Aug 2022 711th xsot 🇸🇬 763 54 37ms 25 Jul 2023 713th strout 762 89 172ms 15 Aug 2022 714th Babafaba 762 122 440ms 14 Oct 2025 715th commandz0 🇺🇸 761 78 23ms 22 Aug 2023 715th ahmetdemirag 🇨🇾 761 78 156ms 11 Feb 2025 717th kTheLemon 761 100 2ms 2 Apr 2025 718th UnderKoen 🇳🇱 761 147 34ms 20 Apr 2023 719th Shanethegamer 🇺🇸 760 100 125ms 19 Sep 2021 719th MichalMarsalek 🇨🇿 760 100 127ms 3 Mar 2022 First Prev 641–720 of 2,089 Next Last