The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 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 JRaspass 🇬🇧 742 43 153ms 19 Nov 2022 801st Shanethegamer 🇺🇸 742 43 155ms 19 Nov 2022 801st SirBogman 🇺🇸 742 43 160ms 20 Nov 2022 801st trist224 🇫🇷 742 43 147ms 14 Dec 2022 801st MeWhenI 🇻🇦 742 43 157ms 30 Jan 2023 801st Yewzir 🇧🇪 742 43 193ms 14 Feb 2024 801st fuzzylojik-golf 🇺🇸 742 43 143ms 21 Aug 2025 808th h3ra993huskp 🇯🇵 742 94 476ms 30 Nov 2025 809th janbehrens 🇩🇪 741 99 62ms 20 Nov 2022 809th Yewzir 🇧🇪 741 99 56ms 12 Feb 2024 811th Steffan153 🇫🇮 738 65 1,411ms 14 Jan 2023 812th DialFrost 🇸🇬 738 73 4ms 31 Dec 2025 812th MostParsingVex 738 73 4ms 26 hours ago 814th thisishowmymindworks 🇳🇴 737 60 13ms 19 Jun 2024 814th stefangimmillaro 737 60 12ms 4 Sep 2024 814th targrik 737 60 13ms 6 Feb 2025 817th DialFrost 🇸🇬 736 84 45ms 30 Dec 2025 818th rucin93 🇵🇱 735 63 8ms 18 Nov 2025 819th juliusgeo 734 69 16ms 13 Jan 2023 819th jhu04 734 69 18ms 18 Jan 2024 819th ImpressedByRocks 734 69 17ms 15 Nov 2024 822nd Steffan153 🇫🇮 731 106 34ms 14 Jan 2023 823rd MeWhenI 🇻🇦 730 57 339ms 14 Feb 2023 823rd dokutan 730 57 310ms 9 Apr 2024 825th GrayJoKing 🇦🇺 730 61 147ms 31 Aug 2024 826th Steffan153 🇫🇮 729 53 52ms 21 Apr 2023 827th CheeseCake628 🇳🇴 729 65 421ms 18 Oct 2025 828th jared-hughes 728 74 4ms 20 Nov 2022 829th Shanethegamer 🇺🇸 728 75 39ms 18 Dec 2023 830th Chinay-Domitrix 🇺🇸 727 71 2,584ms 2 Apr 2025 831st annaproxy 727 85 243ms 22 Nov 2022 831st Natanaelel 🇸🇪 727 85 263ms 27 Apr 2025 833rd Shanethegamer 🇺🇸 726 84 145ms 22 Nov 2022 834th retrohun 725 44 181ms 30 Dec 2022 834th neel11235813 725 44 173ms 3 Feb 2023 836th jared-hughes 725 61 15ms 20 Nov 2022 836th janbehrens 🇩🇪 725 61 12ms 20 Nov 2022 836th tayloia 🇬🇧 725 61 13ms 9 Jan 2023 836th iczelia 🇩🇪 725 61 13ms 5 Nov 2025 840th Yewzir 🇧🇪 724 123 297ms 12 Feb 2024 840th MeWhenI 🇻🇦 724 123 285ms 9 Apr 2024 842nd jhpaques 🇫🇷 723 70 17ms 30 Nov 2022 842nd michelebastione 🇮🇹 723 70 17ms 7 Dec 2022 842nd Skwerl23 723 70 19ms 5 Feb 2023 842nd celiendonze 🇨🇭 723 70 18ms 21 Apr 2023 842nd epic-programmer-guy 723 70 18ms 20 Dec 2023 842nd Stockoh 🇫🇷 723 70 264ms 24 Apr 2024 842nd CutSandstone 723 70 16ms 5 Jul 2024 842nd Andrey135296 723 70 17ms 25 Oct 2024 842nd Emutis 🇱🇹 723 70 18ms 27 Oct 2024 851st primo-ppcg 🇹🇭 721 43 382ms 20 Nov 2022 852nd snoozingnewt 🇨🇦 720 68 126ms 8 Oct 2023 852nd rboath 720 68 2,090ms 11 Dec 2024 854th Alex-x90 🇺🇸 719 75 4ms 20 Nov 2022 854th Irratix 🇳🇱 719 75 4ms 14 Jan 2023 854th Vinterion 719 75 4ms 19 Jul 2024 857th FortuiteMan 🇫🇷 719 110 255ms 28 Jan 2026 858th prplz 🇦🇺 718 86 243ms 16 Jan 2023 859th msbranicky 718 124 289ms 3 Oct 2023 860th dokutan 717 72 2,465ms 15 Dec 2025 861st edsrzf 🇳🇿 716 82 23ms 9 Sep 2025 862nd MeWhenI 🇻🇦 715 36 313ms 30 Dec 2023 863rd syntax-rules 715 75 52ms 15 May 2023 864th Alex-x90 🇺🇸 713 62 13ms 14 Jan 2023 864th m-tkach 🇺🇦 713 62 15ms 20 Mar 2023 864th emgordon154 713 62 15ms 19 Mar 2025 864th Yax42 🇫🇷 713 62 15ms 6 Sep 2025 868th Fishron 713 71 19ms 29 Nov 2022 868th wobblybits 713 71 18ms 29 Aug 2025 870th msbranicky 713 161 1,703ms 16 Sep 2025 871st inventshah 712 64 152ms 4 Aug 2024 872nd Steffan153 🇫🇮 712 65 17ms 13 Feb 2026 873rd sean-niemann 🇺🇸 711 87 42ms 21 Apr 2023 874th 4hg 🇺🇸 710 58 56ms 11 Dec 2022 874th csharpython 710 58 50ms 5 Aug 2025 874th gmacdougall 710 58 53ms 25 Jan 2026 877th brimstonetrader 710 87 282ms 24 Dec 2023 878th RYNO8 709 76 3ms 20 Aug 2023 879th dokutan 706 34 37ms 21 Aug 2024 880th masflam 705 59 280ms 21 Jun 2024 First Prev 801–880 of 1,885 Next Last