The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 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 478th JayXon 🇺🇸 934 60 466ms 26 Sep 2025 478th pardouin 🇫🇷 934 60 463ms 26 Sep 2025 478th fuzzylojik-golf 🇺🇸 934 60 460ms 26 Sep 2025 478th namelessiw 934 60 369ms 2 Oct 2025 478th Yewzir 🇧🇪 934 60 378ms 2 Oct 2025 478th Yax42 🇫🇷 934 60 582ms 3 Oct 2025 478th b-illy 🇬🇧 934 60 491ms 3 Oct 2025 478th ovs-code 🇩🇪 934 60 486ms 3 Oct 2025 478th CaedenHarper 🇨🇦 934 60 457ms 3 Oct 2025 478th m-tkach 🇺🇦 934 60 328ms 3 Oct 2025 478th stefangimmillaro 934 60 447ms 6 Oct 2025 478th snoozingnewt 🇨🇦 934 60 457ms 20 Oct 2025 478th sisyphus-ppcg 🇦🇺 934 60 360ms 26 Nov 2025 478th Lydxn 🇨🇦 934 60 408ms 12 Dec 2025 478th KasperKivimaeki 🇫🇮 934 60 429ms 12 Dec 2025 478th emgordon154 934 60 356ms 9 Feb 2026 478th Steffan153 🇫🇮 934 60 366ms 11 Feb 2026 478th GolfingSuccess 🇬🇷 934 60 406ms 10 days ago 499th rak1507 🇬🇧 933 18 2ms 11 Mar 2022 499th lynn 933 18 2ms 27 May 2022 499th Steffan153 🇫🇮 933 18 2ms 22 Feb 2023 499th pardouin 🇫🇷 933 18 2ms 16 Apr 2025 499th AdrienHache 🇫🇷 933 18 3ms 1 Dec 2025 499th emgordon154 933 18 2ms 11 days ago 505th NewDefectus 🇮🇱 933 29 38ms 8 May 2021 505th akshatj27 🇦🇶 933 29 36ms 11 Jan 2022 505th m-tkach 🇺🇦 933 29 37ms 23 Nov 2022 505th DialFrost 🇸🇬 933 29 36ms 13 Jan 2023 505th sean-niemann 🇺🇸 933 29 37ms 29 Jan 2023 505th MeWhenI 🇻🇦 933 29 37ms 30 Jan 2023 505th JayXon 🇺🇸 933 29 35ms 25 Dec 2023 505th sisyphus-ppcg 🇦🇺 933 29 39ms 25 Dec 2023 505th Yewzir 🇧🇪 933 29 32ms 25 Dec 2023 505th GrayJoKing 🇦🇺 933 29 34ms 26 Dec 2023 505th Lydxn 🇨🇦 933 29 38ms 29 Dec 2023 505th xsot 🇸🇬 933 29 32ms 30 Dec 2023 505th fuzzylojik-golf 🇺🇸 933 29 38ms 30 Aug 2025 505th snoozingnewt 🇨🇦 933 29 36ms 3 Dec 2025 505th GolfingSuccess 🇬🇷 933 29 32ms 10 days ago 520th Yewzir 🇧🇪 933 33 1ms 18 Nov 2025 520th sean-niemann 🇺🇸 933 33 1ms 18 Nov 2025 520th rucin93 🇵🇱 933 33 1ms 18 Nov 2025 520th edsrzf 🇳🇿 933 33 1ms 18 Nov 2025 520th DialFrost 🇸🇬 933 33 1ms 19 Nov 2025 520th JayXon 🇺🇸 933 33 1ms 19 Nov 2025 520th GrayJoKing 🇦🇺 933 33 1ms 19 Nov 2025 520th pardouin 🇫🇷 933 33 1ms 19 Nov 2025 520th snoozingnewt 🇨🇦 933 33 1ms 3 Dec 2025 520th Steffan153 🇫🇮 933 33 1ms 13 Feb 2026 520th GolfingSuccess 🇬🇷 933 33 2ms 10 days ago 531st primo-ppcg 🇹🇭 932 41 122ms 18 Jun 2019 531st JayXon 🇺🇸 932 41 123ms 9 Feb 2021 531st GrayJoKing 🇦🇺 932 41 124ms 9 Feb 2021 531st prplz 🇦🇺 932 41 118ms 10 Feb 2021 531st sisyphus-ppcg 🇦🇺 932 41 121ms 10 Feb 2021 531st Lydxn 🇨🇦 932 41 122ms 10 Feb 2021 531st lynn 932 41 119ms 11 Sep 2021 531st m-tkach 🇺🇦 932 41 127ms 24 Oct 2022 531st sean-niemann 🇺🇸 932 41 124ms 3 Nov 2022 531st MeWhenI 🇻🇦 932 41 124ms 5 Nov 2022 531st Steffan153 🇫🇮 932 41 124ms 3 Dec 2022 531st DialFrost 🇸🇬 932 41 123ms 12 Jan 2023 531st Shanethegamer 🇺🇸 932 41 124ms 6 Feb 2023 531st MWI-polygolf 932 41 127ms 18 Feb 2023 531st steffan-polygolf 932 41 124ms 19 Feb 2023 531st stefangimmillaro 932 41 124ms 11 Jun 2023 531st ovs-code 🇩🇪 932 41 124ms 17 Jul 2023 531st Yewzir 🇧🇪 932 41 124ms 20 Oct 2023 531st Betuaredead 932 41 121ms 11 Nov 2023 531st dokutan 932 41 123ms 26 Mar 2024 531st pardouin 🇫🇷 932 41 125ms 17 Aug 2024 531st edsrzf 🇳🇿 932 41 125ms 22 Jul 2025 531st rucin93 🇵🇱 932 41 123ms 24 Jul 2025 531st fuzzylojik-golf 🇺🇸 932 41 120ms 7 Aug 2025 531st snoozingnewt 🇨🇦 932 41 125ms 3 Dec 2025 556th Lydxn 🇨🇦 932 67 58ms 1 Jan 2022 556th prplz 🇦🇺 932 67 58ms 1 Jan 2022 556th JayXon 🇺🇸 932 67 61ms 1 Jan 2022 556th primo-ppcg 🇹🇭 932 67 59ms 18 Jan 2022 556th GrayJoKing 🇦🇺 932 67 53ms 18 Feb 2022 First Prev 481–560 of 3,388 Next Last