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 796th m-tkach 🇺🇦 918 32 262ms 14 Aug 2024 796th pardouin 🇫🇷 918 32 342ms 18 Aug 2024 796th snoozingnewt 🇨🇦 918 32 274ms 8 Dec 2025 804th Shanethegamer 🇺🇸 917 37 471ms 24 Mar 2024 804th CaedenHarper 🇨🇦 917 37 424ms 3 Oct 2024 806th Steffan153 🇫🇮 917 47 6ms 9 Aug 2024 806th sean-niemann 🇺🇸 917 47 5ms 17 Aug 2025 808th Lydxn 🇨🇦 917 49 35ms 13 Jun 2022 808th primo-ppcg 🇹🇭 917 49 36ms 13 Jun 2022 808th GrayJoKing 🇦🇺 917 49 37ms 22 Jun 2022 808th JayXon 🇺🇸 917 49 35ms 9 Sep 2022 808th MeWhenI 🇻🇦 917 49 34ms 5 Nov 2022 808th Steffan153 🇫🇮 917 49 37ms 27 Nov 2022 808th DialFrost 🇸🇬 917 49 35ms 13 Jan 2023 808th sean-niemann 🇺🇸 917 49 37ms 21 Apr 2023 808th prplz 🇦🇺 917 49 34ms 22 May 2023 808th Yewzir 🇧🇪 917 49 35ms 12 Oct 2023 808th Betuaredead 917 49 34ms 11 Nov 2023 808th pardouin 🇫🇷 917 49 36ms 5 Oct 2024 808th fuzzylojik-golf 🇺🇸 917 49 37ms 6 Sep 2025 808th CaedenHarper 🇨🇦 917 49 38ms 27 Oct 2025 808th snoozingnewt 🇨🇦 917 49 37ms 23 days ago 823rd Steffan153 🇫🇮 917 52 109ms 7 Aug 2024 824th btnlq 916 38 3ms 18 Aug 2024 825th UnderKoen 🇳🇱 916 58 1ms 6 Jul 2022 825th sisyphus-ppcg 🇦🇺 916 58 1ms 7 Jul 2022 825th m-tkach 🇺🇦 916 58 1ms 8 Mar 2023 825th orthoplex 🇨🇽 916 58 1ms 29 Jun 2023 825th Lydxn 🇨🇦 916 58 2ms 19 Jul 2023 830th jared-hughes 915 49 1ms 16 Mar 2022 830th m-tkach 🇺🇦 915 49 1ms 15 Aug 2022 830th kkoenig 915 49 1ms 4 Jan 2024 830th dokutan 915 49 1ms 27 Apr 2024 830th FlyingPenguin223 915 49 1ms 18 Dec 2024 830th Yax42 🇫🇷 915 49 1ms 15 Oct 2025 830th Herbert00709 🇵🇱 915 49 2ms 12 days ago 837th Natanaelel 🇸🇪 914 36 10ms 25 Jun 2022 837th scpchicken 🇵🇼 914 36 9ms 25 Feb 2023 837th Yax42 🇫🇷 914 36 10ms 5 Sep 2025 840th marshallward 🇺🇸 914 49 39ms 20 Nov 2022 841st Lydxn 🇨🇦 914 60 465ms 27 Feb 2022 841st JayXon 🇺🇸 914 60 436ms 27 Feb 2022 841st GrayJoKing 🇦🇺 914 60 467ms 28 Feb 2022 841st lynn 914 60 474ms 3 Jun 2022 841st sean-niemann 🇺🇸 914 60 473ms 4 Nov 2022 841st MeWhenI 🇻🇦 914 60 464ms 5 Nov 2022 841st Steffan153 🇫🇮 914 60 460ms 1 Jan 2023 841st DialFrost 🇸🇬 914 60 424ms 13 Jan 2023 841st Shanethegamer 🇺🇸 914 60 479ms 6 Feb 2023 841st sisyphus-ppcg 🇦🇺 914 60 475ms 23 Mar 2023 841st prplz 🇦🇺 914 60 475ms 22 May 2023 841st ovs-code 🇩🇪 914 60 459ms 17 Jul 2023 841st Yewzir 🇧🇪 914 60 459ms 11 Oct 2023 841st Betuaredead 914 60 431ms 11 Nov 2023 841st pardouin 🇫🇷 914 60 459ms 18 Aug 2024 841st fuzzylojik-golf 🇺🇸 914 60 463ms 18 Jul 2025 841st edsrzf 🇳🇿 914 60 475ms 4 Sep 2025 841st snoozingnewt 🇨🇦 914 60 458ms 20 Oct 2025 841st emgordon154 914 60 466ms 8 Feb 2026 841st GolfingSuccess 🇬🇷 914 60 405ms 15 days ago 861st Lydxn 🇨🇦 914 68 24ms 16 Apr 2022 861st JayXon 🇺🇸 914 68 24ms 17 Apr 2022 861st prplz 🇦🇺 914 68 24ms 17 Apr 2022 861st primo-ppcg 🇹🇭 914 68 24ms 25 Jun 2022 861st m-tkach 🇺🇦 914 68 25ms 26 Jun 2022 861st emplv 🇱🇻 914 68 25ms 22 Nov 2022 861st Steffan153 🇫🇮 914 68 24ms 24 Jan 2023 861st DialFrost 🇸🇬 914 68 25ms 5 Feb 2023 861st GrayJoKing 🇦🇺 914 68 26ms 19 Mar 2023 861st Shanethegamer 🇺🇸 914 68 25ms 19 Mar 2023 861st sean-niemann 🇺🇸 914 68 25ms 13 Apr 2023 861st Betuaredead 914 68 23ms 13 Nov 2023 861st Yewzir 🇧🇪 914 68 25ms 14 Nov 2023 861st pardouin 🇫🇷 914 68 23ms 19 Aug 2024 861st edsrzf 🇳🇿 914 68 26ms 22 Jul 2025 861st fuzzylojik-golf 🇺🇸 914 68 25ms 20 Aug 2025 861st snoozingnewt 🇨🇦 914 68 24ms 6 Dec 2025 861st GolfingSuccess 🇬🇷 914 68 26ms 15 days ago 879th MeWhenI 🇻🇦 913 35 4ms 24 Jun 2022 880th prplz 🇦🇺 913 39 83ms 10 Feb 2021 First Prev 801–880 of 3,434 Next Last