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 720th snoozingnewt 🇨🇦 769 71 27ms 9 Oct 2025 722nd janbehrens 🇩🇪 768 116 286ms 20 Nov 2022 723rd aksyristos 767 66 19ms 17 Jan 2023 723rd OllieBoyne 🇬🇧 767 66 20ms 28 Feb 2023 723rd randolchance 767 66 20ms 12 Mar 2023 723rd CheeseCake628 🇳🇴 767 66 21ms 19 Mar 2023 723rd adamnielson42 🇺🇸 767 66 18ms 31 Mar 2023 723rd ehulinsky 🇺🇸 767 66 20ms 8 May 2023 723rd TheoKeller1 767 66 18ms 11 Jun 2023 723rd dranjohn 767 66 18ms 11 Sep 2023 723rd inverseLorentz 🇦🇺 767 66 20ms 23 Oct 2023 723rd RedzGoose 🇦🇺 767 66 19ms 23 Oct 2024 723rd yokasuretsu 767 66 18ms 7 Jan 2025 723rd croc54 767 66 19ms 13 Jan 2025 723rd ejini6969 767 66 18ms 14 Jun 2025 723rd osNiko 🇧🇷 767 66 18ms 20 Aug 2025 723rd Troon 767 66 23ms 22 Aug 2025 738th Irratix 🇳🇱 764 96 65ms 11 Dec 2022 739th Steffan153 🇫🇮 763 77 41ms 20 Feb 2026 740th AlephSquirrel 762 58 124ms 1 Jun 2023 741st JGDoerrer 761 90 127ms 20 Dec 2022 741st klixel 🇨🇦 761 90 124ms 17 Apr 2023 741st TylerBloom 761 90 124ms 22 Mar 2024 741st Aurel300 🇨🇭 761 90 123ms 8 Jun 2024 745th ovs-code 🇩🇪 759 70 23ms 14 Dec 2024 746th lynn 759 102 30ms 18 Jul 2023 746th m-tkach 🇺🇦 759 102 31ms 7 Dec 2023 748th DialFrost 🇸🇬 758 69 163ms 19 Dec 2025 749th tigerdan2 🇩🇪 758 92 503ms 30 Nov 2025 750th SirBogman 🇺🇸 756 41 372ms 9 Jan 2024 750th dcgjb 756 41 1,752ms 31 Jan 2024 750th IISResetMe 756 41 339ms 10 Apr 2024 750th juliansiebert 🇩🇪 756 41 347ms 2 Feb 2025 754th snoozingnewt 🇨🇦 756 55 222ms 9 Oct 2025 755th bob-th 756 67 19ms 23 Dec 2022 755th n0Oo0Oo0b 756 67 18ms 29 Dec 2022 755th betaveros 756 67 31ms 31 Dec 2022 755th vgamula 🇺🇦 756 67 18ms 15 Mar 2023 755th VictorStenvers 🇳🇱 756 67 18ms 26 Mar 2025 760th Alex-x90 🇺🇸 756 97 64ms 20 Nov 2022 761st snoozingnewt 🇨🇦 755 118 299ms 9 Oct 2025 762nd dokutan 754 92 432ms 15 Jul 2025 763rd MeWhenI 🇻🇦 753 66 41ms 14 May 2023 764th GrayJoKing 🇦🇺 753 78 43ms 13 Aug 2023 765th msbranicky 752 63 432ms 16 Jan 2024 766th prestosilver 🇺🇸 752 76 375ms 3 days ago 767th dokutan 750 32 3ms 14 Nov 2024 768th retrohun 750 64 4,085ms 5 Nov 2023 769th Shanethegamer 🇺🇸 750 81 1,318ms 30 Nov 2022 770th inventshah 749 59 17ms 20 Nov 2022 770th Argeento 🇵🇱 749 59 14ms 26 Aug 2023 770th DialFrost 🇸🇬 749 59 16ms 19 Dec 2025 770th error256 749 59 19ms 24 Dec 2025 774th GolfingSuccess 🇬🇷 749 111 122ms 13 days ago 775th emgordon154 749 119 301ms 19 Mar 2025 776th m-tkach 🇺🇦 748 72 4ms 22 Nov 2022 776th emplv 🇱🇻 748 72 4ms 30 Nov 2022 776th Steffan153 🇫🇮 748 72 4ms 3 Jan 2023 776th sean-niemann 🇺🇸 748 72 5ms 7 May 2024 776th solisolu 748 72 4ms 19 Nov 2025 781st steffan-polygolf 748 73 24ms 7 Mar 2024 782nd MeWhenI 🇻🇦 748 98 65ms 9 Apr 2024 782nd snoozingnewt 🇨🇦 748 98 416ms 6 Oct 2025 784th m-tkach 🇺🇦 747 106 44ms 13 Mar 2023 785th Yewzir 🇧🇪 745 72 27ms 6 Mar 2024 786th msbranicky 745 92 134ms 1 Oct 2023 787th janbehrens 🇩🇪 744 63 14ms 20 Nov 2022 788th MaxElf999 744 68 18ms 21 Nov 2022 788th guilhem-roy 🇫🇷 744 68 20ms 21 Nov 2022 788th knutae 🇳🇴 744 68 17ms 30 Nov 2022 788th 4ndyJ 🇬🇧 744 68 17ms 10 Jan 2023 788th andre-lameirinhas 🇵🇹 744 68 18ms 18 May 2023 788th WillConker 744 68 18ms 16 Jul 2023 788th AforAmpere 744 68 17ms 20 Sep 2023 788th Simpos 744 68 25ms 24 Oct 2023 788th mikehanus 744 68 19ms 22 Nov 2023 788th chartung17 744 68 17ms 31 Dec 2023 788th mathisfun271 744 68 24ms 13 Feb 2024 788th moustave 744 68 18ms 12 Nov 2024 800th dokutan 744 92 26ms 24 Nov 2025 First Prev 721–800 of 1,887 Next Last