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?
Pernicious 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 801st GolfingSuccess 🇬🇷 743 79 31ms 14 days ago 802nd JRaspass 🇬🇧 742 43 153ms 19 Nov 2022 802nd Shanethegamer 🇺🇸 742 43 155ms 19 Nov 2022 802nd SirBogman 🇺🇸 742 43 160ms 20 Nov 2022 802nd trist224 🇫🇷 742 43 147ms 14 Dec 2022 802nd MeWhenI 🇻🇦 742 43 157ms 30 Jan 2023 802nd Yewzir 🇧🇪 742 43 193ms 14 Feb 2024 802nd fuzzylojik-golf 🇺🇸 742 43 143ms 21 Aug 2025 809th h3ra993huskp 🇯🇵 742 94 476ms 30 Nov 2025 810th janbehrens 🇩🇪 741 99 62ms 20 Nov 2022 810th Yewzir 🇧🇪 741 99 56ms 12 Feb 2024 812th Steffan153 🇫🇮 738 65 1,411ms 14 Jan 2023 813th DialFrost 🇸🇬 738 73 4ms 31 Dec 2025 813th MostParsingVex 738 73 4ms 3 days ago 815th thisishowmymindworks 🇳🇴 737 60 13ms 19 Jun 2024 815th stefangimmillaro 737 60 12ms 4 Sep 2024 815th targrik 737 60 14ms 6 Feb 2025 818th DialFrost 🇸🇬 736 84 45ms 30 Dec 2025 819th rucin93 🇵🇱 735 63 8ms 18 Nov 2025 820th juliusgeo 734 69 16ms 13 Jan 2023 820th jhu04 734 69 18ms 18 Jan 2024 820th ImpressedByRocks 734 69 17ms 15 Nov 2024 823rd Steffan153 🇫🇮 731 106 34ms 14 Jan 2023 824th MeWhenI 🇻🇦 730 57 339ms 14 Feb 2023 824th dokutan 730 57 310ms 9 Apr 2024 826th GrayJoKing 🇦🇺 730 61 147ms 31 Aug 2024 827th Steffan153 🇫🇮 729 53 52ms 21 Apr 2023 828th CheeseCake628 🇳🇴 729 65 421ms 18 Oct 2025 829th jared-hughes 728 74 4ms 20 Nov 2022 830th Shanethegamer 🇺🇸 728 75 39ms 18 Dec 2023 831st Chinay-Domitrix 🇺🇸 727 71 2,584ms 2 Apr 2025 832nd annaproxy 727 85 243ms 22 Nov 2022 832nd Natanaelel 🇸🇪 727 85 263ms 27 Apr 2025 834th Shanethegamer 🇺🇸 726 84 145ms 22 Nov 2022 835th retrohun 725 44 181ms 30 Dec 2022 835th neel11235813 725 44 173ms 3 Feb 2023 837th jared-hughes 725 61 15ms 20 Nov 2022 837th janbehrens 🇩🇪 725 61 14ms 20 Nov 2022 837th tayloia 🇬🇧 725 61 17ms 9 Jan 2023 837th iczelia 🇩🇪 725 61 13ms 5 Nov 2025 841st Yewzir 🇧🇪 724 123 297ms 12 Feb 2024 841st MeWhenI 🇻🇦 724 123 285ms 9 Apr 2024 843rd jhpaques 🇫🇷 723 70 17ms 30 Nov 2022 843rd michelebastione 🇮🇹 723 70 17ms 7 Dec 2022 843rd Skwerl23 723 70 19ms 5 Feb 2023 843rd celiendonze 🇨🇭 723 70 18ms 21 Apr 2023 843rd epic-programmer-guy 723 70 18ms 20 Dec 2023 843rd Stockoh 🇫🇷 723 70 264ms 24 Apr 2024 843rd CutSandstone 723 70 16ms 5 Jul 2024 843rd Andrey135296 723 70 17ms 25 Oct 2024 843rd Emutis 🇱🇹 723 70 18ms 27 Oct 2024 852nd primo-ppcg 🇹🇭 721 43 382ms 20 Nov 2022 853rd snoozingnewt 🇨🇦 720 68 126ms 8 Oct 2023 853rd rboath 720 68 2,090ms 11 Dec 2024 855th Alex-x90 🇺🇸 719 75 4ms 20 Nov 2022 855th Irratix 🇳🇱 719 75 4ms 14 Jan 2023 855th Vinterion 719 75 4ms 19 Jul 2024 858th FortuiteMan 🇫🇷 719 110 255ms 28 Jan 2026 859th prplz 🇦🇺 718 86 243ms 16 Jan 2023 860th msbranicky 718 124 289ms 3 Oct 2023 861st dokutan 717 72 2,465ms 15 Dec 2025 862nd edsrzf 🇳🇿 716 82 23ms 9 Sep 2025 863rd MeWhenI 🇻🇦 715 36 313ms 30 Dec 2023 864th syntax-rules 715 75 52ms 15 May 2023 865th Alex-x90 🇺🇸 713 62 18ms 14 Jan 2023 865th m-tkach 🇺🇦 713 62 15ms 20 Mar 2023 865th emgordon154 713 62 15ms 19 Mar 2025 865th Yax42 🇫🇷 713 62 14ms 6 Sep 2025 869th Fishron 713 71 19ms 29 Nov 2022 869th wobblybits 713 71 18ms 29 Aug 2025 871st msbranicky 713 161 1,703ms 16 Sep 2025 872nd inventshah 712 64 152ms 4 Aug 2024 873rd Steffan153 🇫🇮 712 65 17ms 13 Feb 2026 874th sean-niemann 🇺🇸 711 87 42ms 21 Apr 2023 875th 4hg 🇺🇸 710 58 56ms 11 Dec 2022 875th csharpython 710 58 50ms 5 Aug 2025 875th gmacdougall 710 58 53ms 25 Jan 2026 878th brimstonetrader 710 87 282ms 24 Dec 2023 879th RYNO8 709 76 3ms 20 Aug 2023 880th dokutan 706 34 37ms 21 Aug 2024 First Prev 801–880 of 1,887 Next Last