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?
Ordinal Numbers 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 639th juliansiebert 🇩🇪 790 67 268ms 10 Nov 2024 639th madex 🇩🇪 790 67 330ms 9 days ago 643rd tuffnatty 🇩🇪 790 104 11ms 20 Jul 2023 644th Shanethegamer 🇺🇸 790 156 294ms 2 Nov 2024 645th DialFrost 🇸🇬 788 92 2ms 6 Mar 2024 645th ovs-code 🇩🇪 788 92 2ms 21 Mar 2024 645th GolfingSuccess 🇬🇷 788 92 2ms 6 Mar 2025 648th jbbarth 🇫🇷 787 56 41ms 10 Aug 2021 648th SirBogman 🇺🇸 787 56 34ms 21 May 2022 648th denkyuu1 787 56 41ms 16 Feb 2026 651st GolfingSuccess 🇬🇷 787 132 3ms 6 Mar 2025 652nd btjones0 787 138 159ms 9 Jan 2021 652nd DialFrost 🇸🇬 787 138 159ms 25 Aug 2024 652nd edsrzf 🇳🇿 787 138 163ms 71 mins ago 655th tomh1012 786 81 12ms 16 Sep 2020 655th maxpelic 🇺🇸 786 81 14ms 5 Jul 2022 655th CarsonChr 🇺🇸 786 81 13ms 23 Apr 2024 655th dokutan 786 81 12ms 20 Mar 2025 659th cafehaine 🇫🇷 786 93 3ms 27 Apr 2022 659th Blendi-Goose 786 93 3ms 16 Mar 2025 661st ovs-code 🇩🇪 785 78 6ms 10 Feb 2023 662nd pardouin 🇫🇷 784 96 2,726ms 26 Oct 2024 663rd emplv 🇱🇻 783 76 6ms 3 Jul 2023 664th saito-ta 🇯🇵 781 32 58ms 25 Jan 2024 664th ovs-code 🇩🇪 781 32 59ms 21 Mar 2024 664th fuzzylojik-golf 🇺🇸 781 32 61ms 9 Aug 2025 664th DialFrost 🇸🇬 781 32 61ms 9 Sep 2025 664th Steffan153 🇫🇮 781 32 56ms 14 Feb 2026 669th Shanethegamer 🇺🇸 781 133 3ms 10 Sep 2022 669th inventshah 781 133 3ms 11 Sep 2022 671st filharmonista 780 93 2ms 13 Mar 2020 671st ccbrown 780 93 2ms 20 Apr 2020 671st prplz 🇦🇺 780 93 2ms 13 Feb 2022 674th voytxt 🇨🇿 779 232 1,491ms 28 Feb 2025 675th JRaspass 🇬🇧 778 48 3ms 11 Jul 2019 675th scpchicken 🇵🇼 778 48 4ms 9 Apr 2022 677th DialFrost 🇸🇬 778 60 30ms 2 Aug 2025 678th prplz 🇦🇺 778 68 627ms 5 Jun 2020 679th MeWhenI 🇻🇦 778 90 33ms 9 May 2024 680th primo-ppcg 🇹🇭 778 114 374ms 15 Jan 2021 681st Bubbler-4 777 41 3ms 19 Jan 2022 681st rak1507 🇬🇧 777 41 3ms 2 Jan 2023 683rd CatsAreFluffy 776 57 4ms 23 Jan 2023 684th rucin93 🇵🇱 776 75 172ms 31 Oct 2024 685th DayDun 🇸🇪 776 82 11ms 22 Jan 2023 685th CatsAreFluffy 776 82 14ms 18 Feb 2023 687th Shanethegamer 🇺🇸 776 97 110ms 14 Oct 2022 687th MeWhenI 🇻🇦 776 97 2,753ms 27 Oct 2024 689th revlayle 🇺🇸 776 105 400ms 21 Nov 2021 689th Steffan153 🇫🇮 776 105 386ms 28 Jan 2023 691st dokutan 776 134 3ms 29 Jun 2024 691st albanian-laundromat 776 134 3ms 19 Dec 2025 693rd elgan65536 🇺🇸 776 140 167ms 10 Apr 2024 694th GolfingSuccess 🇬🇷 774 95 18ms 6 Mar 2025 695th RussellEmerine 774 146 175ms 30 Nov 2019 695th guliyevemil1 🇦🇿 774 146 174ms 25 Apr 2020 697th anter69 🇭🇺 773 57 56ms 2 Apr 2024 698th annaproxy 773 82 19ms 24 Nov 2021 699th Attero 🇸🇪 772 94 2ms 24 May 2020 700th Babafaba 771 74 394ms 10 Oct 2025 701st nipzu 771 141 171ms 13 Jan 2022 701st Shanethegamer 🇺🇸 771 141 159ms 16 Sep 2024 703rd MeWhenI 🇻🇦 769 106 389ms 26 Jul 2023 703rd stefangimmillaro 769 106 404ms 26 Jul 2023 703rd sean-niemann 🇺🇸 769 106 458ms 9 Aug 2024 706th m-tkach 🇺🇦 769 136 25ms 20 Feb 2023 707th MeWhenI 🇻🇦 769 254 12ms 21 Apr 2025 708th stefangimmillaro 768 98 2,722ms 30 Oct 2024 708th edsrzf 🇳🇿 768 98 112ms 8 Nov 2025 710th DialFrost 🇸🇬 767 47 36ms 27 Jan 2023 711th mintypython 767 83 11ms 14 Aug 2019 711th fitzdotlol 🇺🇸 767 83 16ms 8 Mar 2022 711th inventshah 767 83 11ms 23 Aug 2022 711th adamnielson42 🇺🇸 767 83 11ms 25 Apr 2023 711th TheDarkThatBarks 767 83 11ms 28 Jan 2024 716th Shanethegamer 🇺🇸 766 96 15ms 5 Oct 2021 716th DialFrost 🇸🇬 766 96 17ms 9 Dec 2024 718th targrik 766 161 304ms 3 Jul 2025 719th primo-ppcg 🇹🇭 765 61 1,055ms 18 Feb 2022 720th MeWhenI 🇻🇦 765 80 6ms 2 Oct 2022 First Prev 641–720 of 1,893 Next Last