The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 days. Why not try and solve them ahead of time?
Pernicious Numbers 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 641st inventshah 929 40 1ms 30 Oct 2022 641st Lydxn 🇨🇦 929 40 1ms 30 Oct 2022 641st GrayJoKing 🇦🇺 929 40 1ms 3 Nov 2022 641st sisyphus-ppcg 🇦🇺 929 40 1ms 3 Nov 2022 641st sean-niemann 🇺🇸 929 40 1ms 4 Nov 2022 641st btnlq 929 40 1ms 5 Nov 2022 641st MeWhenI 🇻🇦 929 40 1ms 5 Nov 2022 641st primo-ppcg 🇹🇭 929 40 1ms 6 Nov 2022 641st Steffan153 🇫🇮 929 40 1ms 26 Nov 2022 641st DialFrost 🇸🇬 929 40 1ms 12 Jan 2023 641st prplz 🇦🇺 929 40 1ms 12 Jan 2023 641st Shanethegamer 🇺🇸 929 40 1ms 6 Feb 2023 641st JayXon 🇺🇸 929 40 1ms 16 Mar 2023 641st xsot 🇸🇬 929 40 1ms 14 Jul 2023 641st Yewzir 🇧🇪 929 40 1ms 12 Oct 2023 641st Betuaredead 929 40 1ms 11 Nov 2023 641st pardouin 🇫🇷 929 40 1ms 17 Aug 2024 641st fuzzylojik-golf 🇺🇸 929 40 2ms 1 Jul 2025 641st edsrzf 🇳🇿 929 40 1ms 4 Sep 2025 641st snoozingnewt 🇨🇦 929 40 2ms 20 Oct 2025 641st KasperKivimaeki 🇫🇮 929 40 1ms 15 Dec 2025 641st GolfingSuccess 🇬🇷 929 40 1ms 15 days ago 663rd NewDefectus 🇮🇱 928 22 33ms 10 Oct 2021 663rd yzhs 🇩🇪 928 22 33ms 20 Jul 2022 663rd saltysylvi 928 22 34ms 5 Aug 2022 663rd ashtraypettingzoo 🇺🇸 928 22 33ms 22 Feb 2023 663rd MeWhenI 🇻🇦 928 22 33ms 7 Aug 2023 663rd Yewzir 🇧🇪 928 22 33ms 6 Nov 2023 663rd Natanaelel 🇸🇪 928 22 33ms 28 Nov 2023 663rd orthoplex 🇨🇽 928 22 33ms 20 Jul 2024 671st o0lit3 🇺🇸 928 25 103ms 11 Feb 2021 671st SirBogman 🇺🇸 928 25 103ms 31 May 2022 673rd edsrzf 🇳🇿 927 32 962ms 4 Sep 2025 673rd DialFrost 🇸🇬 927 32 935ms 4 Sep 2025 673rd CaedenHarper 🇨🇦 927 32 934ms 9 Sep 2025 673rd sean-niemann 🇺🇸 927 32 685ms 12 Sep 2025 673rd fuzzylojik-golf 🇺🇸 927 32 959ms 22 Sep 2025 673rd snoozingnewt 🇨🇦 927 32 1,052ms 20 Oct 2025 673rd xsot 🇸🇬 927 32 857ms 13 Nov 2025 673rd Yewzir 🇧🇪 927 32 855ms 15 Nov 2025 673rd Steffan153 🇫🇮 927 32 722ms 13 Feb 2026 673rd GolfingSuccess 🇬🇷 927 32 658ms 15 days ago 683rd Lydxn 🇨🇦 927 40 3ms 23 May 2023 683rd primo-ppcg 🇹🇭 927 40 3ms 23 May 2023 683rd GrayJoKing 🇦🇺 927 40 4ms 12 Aug 2023 683rd kg583 🇺🇸 927 40 4ms 16 Oct 2025 683rd GolfingSuccess 🇬🇷 927 40 4ms 15 days ago 688th scpchicken 🇵🇼 926 25 3ms 17 days ago 689th inventshah 926 42 2ms 9 Sep 2022 689th Lydxn 🇨🇦 926 42 2ms 9 Sep 2022 689th JayXon 🇺🇸 926 42 2ms 10 Sep 2022 689th btnlq 926 42 2ms 10 Sep 2022 689th GrayJoKing 🇦🇺 926 42 2ms 11 Sep 2022 689th m-tkach 🇺🇦 926 42 2ms 25 Oct 2022 689th sean-niemann 🇺🇸 926 42 2ms 3 Nov 2022 689th MeWhenI 🇻🇦 926 42 2ms 5 Nov 2022 689th DialFrost 🇸🇬 926 42 2ms 12 Jan 2023 689th Steffan153 🇫🇮 926 42 2ms 12 Jan 2023 689th Shanethegamer 🇺🇸 926 42 2ms 6 Feb 2023 689th sisyphus-ppcg 🇦🇺 926 42 2ms 23 Mar 2023 689th prplz 🇦🇺 926 42 2ms 23 May 2023 689th ovs-code 🇩🇪 926 42 2ms 17 Jul 2023 689th Yewzir 🇧🇪 926 42 2ms 11 Oct 2023 689th Betuaredead 926 42 2ms 11 Nov 2023 689th dokutan 926 42 2ms 27 Mar 2024 689th pardouin 🇫🇷 926 42 2ms 20 Aug 2024 689th stefangimmillaro 926 42 2ms 30 Sep 2024 689th fuzzylojik-golf 🇺🇸 926 42 2ms 18 Jul 2025 689th edsrzf 🇳🇿 926 42 3ms 22 Jul 2025 689th snoozingnewt 🇨🇦 926 42 2ms 20 Oct 2025 689th GolfingSuccess 🇬🇷 926 42 2ms 15 days ago 712th HPWiz 🇳🇿 925 35 1,040ms 3 Jan 2026 713th Lydxn 🇨🇦 925 38 75ms 12 Dec 2022 713th ovs-code 🇩🇪 925 38 78ms 22 Apr 2024 713th DialFrost 🇸🇬 925 38 71ms 27 May 2024 713th sean-niemann 🇺🇸 925 38 77ms 12 Jul 2024 713th Steffan153 🇫🇮 925 38 78ms 13 Jul 2024 713th pardouin 🇫🇷 925 38 73ms 19 Aug 2024 719th Yewzir 🇧🇪 925 41 137ms 22 Dec 2024 719th dokutan 925 41 140ms 22 Dec 2024 First Prev 641–720 of 3,460 Next Last