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 chars. 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 Chars Time Submitted 880th GrayJoKing 🇦🇺 913 39 87ms 11 Feb 2021 880th sisyphus-ppcg 🇦🇺 913 39 76ms 30 May 2021 880th lynn 913 39 85ms 11 Sep 2021 880th inventshah 913 39 90ms 18 Jun 2022 880th MWI-polygolf 913 39 90ms 18 Feb 2023 880th steffan-polygolf 913 39 79ms 19 Feb 2023 880th rucin93 🇵🇱 913 39 83ms 23 Apr 2023 880th Yax42 🇫🇷 913 39 97ms 4 Oct 2025 889th Lydxn 🇨🇦 911 51 3ms 16 Jul 2023 889th GrayJoKing 🇦🇺 911 51 3ms 16 Jul 2023 889th MeWhenI 🇻🇦 911 51 4ms 16 Jul 2023 889th Steffan153 🇫🇮 911 51 3ms 16 Jul 2023 889th btnlq 911 51 3ms 16 Jul 2023 889th ovs-code 🇩🇪 911 51 3ms 17 Jul 2023 889th sean-niemann 🇺🇸 911 51 4ms 12 Jun 2025 889th fuzzylojik-golf 🇺🇸 911 51 4ms 17 Sep 2025 897th dokutan 907 57 378ms 26 Mar 2024 898th canissimia 🇦🇶 907 139 1ms 10 Jul 2021 899th prplz 🇦🇺 906 62 26ms 26 Dec 2022 899th Steffan153 🇫🇮 906 62 27ms 26 Dec 2022 899th GrayJoKing 🇦🇺 906 62 26ms 4 Jan 2023 899th DialFrost 🇸🇬 906 62 26ms 12 Jan 2023 899th m-tkach 🇺🇦 906 62 25ms 12 Jan 2023 899th Lydxn 🇨🇦 906 62 26ms 13 Jan 2023 899th MeWhenI 🇻🇦 906 62 26ms 14 Jan 2023 899th Shanethegamer 🇺🇸 906 62 26ms 6 Feb 2023 899th lynn 906 62 26ms 12 Jul 2023 899th Yewzir 🇧🇪 906 62 27ms 12 Oct 2023 899th Betuaredead 906 62 26ms 11 Nov 2023 899th pardouin 🇫🇷 906 62 25ms 19 Aug 2024 899th sean-niemann 🇺🇸 906 62 25ms 19 May 2025 899th edsrzf 🇳🇿 906 62 25ms 22 Jul 2025 899th snoozingnewt 🇨🇦 906 62 27ms 22 Oct 2025 914th FlyingPenguin223 906 69 65ms 18 Dec 2024 915th DialFrost 🇸🇬 905 36 138ms 3 Aug 2024 915th MeWhenI 🇻🇦 905 36 184ms 3 Aug 2024 915th rucin93 🇵🇱 905 36 135ms 6 Aug 2024 915th sisyphus-ppcg 🇦🇺 905 36 145ms 8 Aug 2024 915th GrayJoKing 🇦🇺 905 36 150ms 13 Aug 2024 915th pardouin 🇫🇷 905 36 138ms 3 Sep 2024 915th emplv 🇱🇻 905 36 130ms 29 Oct 2024 915th fuzzylojik-golf 🇺🇸 905 36 139ms 2 Aug 2025 915th Yewzir 🇧🇪 905 36 144ms 18 Nov 2025 915th GolfingSuccess 🇬🇷 905 36 131ms 15 days ago 925th MeWhenI 🇻🇦 905 38 3ms 5 Nov 2022 925th snoozingnewt 🇨🇦 905 38 3ms 22 Oct 2025 927th Yewzir 🇧🇪 904 41 137ms 22 Dec 2024 927th dokutan 904 41 140ms 22 Dec 2024 927th DialFrost 🇸🇬 904 41 143ms 22 Dec 2024 927th rucin93 🇵🇱 904 41 136ms 22 Dec 2024 927th Shanethegamer 🇺🇸 904 41 155ms 22 Dec 2024 927th pardouin 🇫🇷 904 41 137ms 22 Dec 2024 927th MeWhenI 🇻🇦 904 41 133ms 23 Dec 2024 927th sean-niemann 🇺🇸 904 41 148ms 23 Dec 2024 927th inventshah 904 41 134ms 23 Dec 2024 927th ovs-code 🇩🇪 904 41 135ms 24 Dec 2024 927th primo-ppcg 🇹🇭 904 41 145ms 6 Jan 2025 927th sisyphus-ppcg 🇦🇺 904 41 144ms 6 Jan 2025 927th prplz 🇦🇺 904 41 139ms 7 Jan 2025 927th GrayJoKing 🇦🇺 904 41 150ms 21 Mar 2025 927th edsrzf 🇳🇿 904 41 138ms 22 Jul 2025 927th fuzzylojik-golf 🇺🇸 904 41 147ms 29 Aug 2025 927th snoozingnewt 🇨🇦 904 41 138ms 20 Oct 2025 944th inventshah 904 48 107ms 20 Oct 2022 944th MeWhenI 🇻🇦 904 48 115ms 5 Nov 2022 944th Alex-x90 🇺🇸 904 48 109ms 24 Feb 2023 947th Yewzir 🇧🇪 903 45 1,333ms 14 days ago 948th Yax42 🇫🇷 903 57 138ms 4 Oct 2025 949th btnlq 903 80 1ms 11 Jun 2023 949th saito-ta 🇯🇵 903 80 1ms 11 Jun 2023 951st Waffle3z 902 30 33ms 10 Feb 2021 951st lynn 902 30 35ms 11 Sep 2021 951st Irratix 🇳🇱 902 30 34ms 22 Mar 2022 951st orthoplex 🇨🇽 902 30 36ms 30 Mar 2022 951st SirBogman 🇺🇸 902 30 33ms 31 May 2022 951st inventshah 902 30 36ms 18 Jun 2022 951st jared-hughes 902 30 34ms 10 Sep 2022 951st Shanethegamer 🇺🇸 902 30 34ms 6 Feb 2023 951st ovs-code 🇩🇪 902 30 36ms 17 Jul 2023 951st Betuaredead 902 30 35ms 11 Nov 2023 First Prev 881–960 of 3,434 Next Last