The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 35 mins. 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 640th Steffan153 🇫🇮 798 40 290ms 23 Nov 2022 640th Natanaelel 🇸🇪 798 40 232ms 5 Jan 2024 643rd Yewzir 🇧🇪 798 144 1,847ms 14 Nov 2025 644th Shanethegamer 🇺🇸 796 158 1,456ms 29 May 2025 645th emgordon154 795 56 56ms 6 Jun 2025 646th stefangimmillaro 795 59 28ms 20 Nov 2022 647th snoozingnewt 🇨🇦 795 65 2,562ms 27 Sep 2025 648th inventshah 795 69 13ms 20 Nov 2022 649th emplv 🇱🇻 795 112 277ms 21 Nov 2022 649th sean-niemann 🇺🇸 795 112 291ms 21 Jun 2023 651st msbranicky 794 72 141ms 1 Sep 2023 651st snoozingnewt 🇨🇦 794 72 148ms 9 Oct 2025 653rd kg583 🇺🇸 794 74 41ms 3 hours ago 654th GrayJoKing 🇦🇺 793 67 35ms 26 Oct 2023 654th DialFrost 🇸🇬 793 67 35ms 21 Dec 2023 656th janbehrens 🇩🇪 792 52 44ms 27 Nov 2022 657th Steffan153 🇫🇮 792 78 4,183ms 10 Oct 2023 658th primo-ppcg 🇹🇭 791 60 2ms 20 Nov 2022 659th QuincyNash 🇺🇸 791 64 19ms 20 Nov 2022 659th nstearns96 🇬🇧 791 64 267ms 23 Nov 2022 659th Bodo171 791 64 16ms 27 Nov 2022 659th TaserTheFox 🇺🇸 791 64 18ms 14 Jan 2023 659th jmerle 🇳🇱 791 64 18ms 16 Feb 2023 659th vishwathg 791 64 16ms 7 Apr 2023 659th dteague3989 791 64 17ms 8 Aug 2023 659th NickTheEASDude 🇺🇸 791 64 25ms 1 May 2024 659th aalec 791 64 18ms 3 May 2024 659th mishak-sys 791 64 16ms 25 Feb 2025 659th YAJUE114514 791 64 16ms 1 Aug 2025 659th Deedogg 791 64 16ms 30 Oct 2025 659th netfri25 🇮🇱 791 64 17ms 21 Feb 2026 659th rotemkm 791 64 17ms 21 Feb 2026 673rd KatieLG 🇬🇧 790 60 383ms 16 Jan 2024 673rd steffan-polygolf 790 60 447ms 7 Mar 2024 673rd neel11235813 790 60 363ms 27 Mar 2024 676th MeWhenI 🇻🇦 790 177 38ms 29 Nov 2023 677th Irratix 🇳🇱 789 56 13ms 11 Dec 2022 678th pardouin 🇫🇷 789 68 57ms 25 Apr 2025 679th stefangimmillaro 788 113 291ms 22 Jun 2023 680th sisyphus-ppcg 🇦🇺 785 45 20ms 23 Jan 2023 680th Steffan153 🇫🇮 785 45 4ms 9 Feb 2023 680th DialFrost 🇸🇬 785 45 5ms 25 Nov 2023 683rd DialFrost 🇸🇬 785 59 8ms 26 Dec 2025 684th emgordon154 785 106 120ms 29 Nov 2025 685th Yewzir 🇧🇪 783 43 1,235ms 13 Feb 2024 685th dokutan 783 43 1,264ms 30 Apr 2024 687th Steffan153 🇫🇮 783 84 6ms 16 Jul 2023 687th typeswitch-dev 🇵🇹 783 84 398ms 28 Jul 2023 687th GrayJoKing 🇦🇺 783 84 371ms 29 Jul 2023 690th targrik 782 60 7ms 16 Jan 2025 691st pardouin 🇫🇷 782 79 187ms 22 Apr 2025 692nd inventshah 781 69 5ms 29 Nov 2022 692nd xsot 🇸🇬 781 69 4ms 10 Feb 2024 692nd ovs-code 🇩🇪 781 69 5ms 10 Feb 2024 695th SirBogman 🇺🇸 780 33 339ms 22 Nov 2022 696th fourth-bit 779 65 20ms 11 Jul 2023 696th Bmrl7 779 65 19ms 24 Feb 2024 696th shelerr 779 65 24ms 22 Aug 2025 699th prplz 🇦🇺 778 41 209ms 19 Nov 2022 699th scpchicken 🇵🇼 778 41 211ms 20 Nov 2022 699th SirFireball3521 778 41 215ms 13 Mar 2023 702nd Steffan153 🇫🇮 778 72 111ms 20 Nov 2022 702nd emplv 🇱🇻 778 72 115ms 30 Nov 2022 704th Yewzir 🇧🇪 778 88 25ms 13 Feb 2024 705th albanian-laundromat 777 55 1,956ms 12 Sep 2025 706th Steffan153 🇫🇮 776 57 13ms 14 Jan 2023 706th sisyphus-ppcg 🇦🇺 776 57 13ms 20 Jul 2023 708th rak1507 🇬🇧 774 31 2ms 7 Jan 2023 708th Yewzir 🇧🇪 774 31 9ms 9 Dec 2023 708th snoozingnewt 🇨🇦 774 31 36ms 20 Sep 2025 708th scpchicken 🇵🇼 774 31 4ms 20 days ago 712th pardouin 🇫🇷 773 76 8ms 24 Apr 2025 713th DialFrost 🇸🇬 773 181 51ms 23 May 2025 714th xsot 🇸🇬 772 50 50ms 30 Jan 2024 715th DialFrost 🇸🇬 772 80 184ms 5 Aug 2024 716th dokutan 772 95 60ms 23 Mar 2024 717th Yewzir 🇧🇪 770 90 467ms 12 Feb 2024 718th emplv 🇱🇻 769 61 7ms 21 Jun 2023 719th Yewzir 🇧🇪 769 68 149ms 14 Feb 2024 720th Kaffeleif 769 71 23ms 8 Feb 2024 First Prev 641–720 of 1,887 Next Last