The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?
Pernicious Numbers (Long) 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 641st primo-ppcg 🇹🇭 791 60 2ms 20 Nov 2022 642nd KasperKivimaeki 🇫🇮 791 67 5ms 31 Mar 2025 643rd MeWhenI 🇻🇦 790 177 38ms 29 Nov 2023 644th Irratix 🇳🇱 789 56 16ms 11 Dec 2022 645th pardouin 🇫🇷 789 68 57ms 25 Apr 2025 646th AlephSquirrel 788 50 45ms 7 Mar 2023 646th SirBogman 🇺🇸 788 50 46ms 10 Jan 2024 648th trist224 🇫🇷 788 63 16ms 14 Dec 2022 648th retrohun 788 63 18ms 28 Dec 2022 648th msbranicky 788 63 18ms 23 Jul 2023 648th PeterTillema 🇳🇱 788 63 19ms 18 Mar 2024 648th hellwue 788 63 321ms 25 Jun 2024 648th InigoK 🇺🇸 788 63 27ms 19 Sep 2025 654th sean-niemann 🇺🇸 786 110 295ms 21 Jun 2023 654th stefangimmillaro 786 110 291ms 22 Jun 2023 656th sisyphus-ppcg 🇦🇺 785 45 14ms 23 Jan 2023 656th Steffan153 🇫🇮 785 45 4ms 9 Feb 2023 656th DialFrost 🇸🇬 785 45 5ms 25 Nov 2023 659th DialFrost 🇸🇬 785 59 9ms 26 Dec 2025 660th Yewzir 🇧🇪 783 43 1,235ms 13 Feb 2024 660th dokutan 783 43 1,264ms 30 Apr 2024 662nd rucin93 🇵🇱 783 56 143ms 30 Aug 2024 663rd kg583 🇺🇸 783 75 33ms 14 days ago 664th Steffan153 🇫🇮 783 84 6ms 16 Jul 2023 664th typeswitch-dev 🇵🇹 783 84 398ms 28 Jul 2023 664th GrayJoKing 🇦🇺 783 84 371ms 29 Jul 2023 667th targrik 782 60 7ms 16 Jan 2025 668th pardouin 🇫🇷 782 79 187ms 22 Apr 2025 669th SirBogman 🇺🇸 780 33 339ms 22 Nov 2022 670th inventshah 779 68 5ms 29 Nov 2022 670th xsot 🇸🇬 779 68 4ms 10 Feb 2024 672nd Steffan153 🇫🇮 779 111 301ms 20 Nov 2022 673rd Steffan153 🇫🇮 778 72 111ms 20 Nov 2022 673rd emplv 🇱🇻 778 72 115ms 30 Nov 2022 675th Yewzir 🇧🇪 778 88 25ms 13 Feb 2024 676th albanian-laundromat 777 55 1,915ms 12 Sep 2025 677th pardouin 🇫🇷 777 68 34ms 24 Apr 2025 678th Steffan153 🇫🇮 776 57 18ms 14 Jan 2023 678th sisyphus-ppcg 🇦🇺 776 57 14ms 20 Jul 2023 680th jakobkordez 🇸🇮 776 64 2,242ms 20 Nov 2022 680th nstearns96 🇬🇧 776 64 267ms 23 Nov 2022 680th Bodo171 776 64 16ms 27 Nov 2022 680th TaserTheFox 🇺🇸 776 64 18ms 14 Jan 2023 680th jmerle 🇳🇱 776 64 18ms 16 Feb 2023 680th vishwathg 776 64 16ms 7 Apr 2023 680th dteague3989 776 64 17ms 8 Aug 2023 680th NickTheEASDude 🇺🇸 776 64 25ms 1 May 2024 680th aalec 776 64 18ms 3 May 2024 680th mishak-sys 776 64 16ms 25 Feb 2025 680th YAJUE114514 776 64 16ms 1 Aug 2025 680th Deedogg 776 64 16ms 30 Oct 2025 680th netfri25 🇮🇱 776 64 17ms 21 Feb 2026 680th rotemkm 776 64 17ms 21 Feb 2026 694th emgordon154 776 104 120ms 29 Nov 2025 695th rak1507 🇬🇧 774 31 2ms 7 Jan 2023 695th Yewzir 🇧🇪 774 31 9ms 9 Dec 2023 695th snoozingnewt 🇨🇦 774 31 36ms 20 Sep 2025 695th scpchicken 🇵🇼 774 31 4ms 15 days ago 699th albanian-laundromat 773 59 437ms 8 Oct 2025 700th pardouin 🇫🇷 773 76 8ms 24 Apr 2025 701st DialFrost 🇸🇬 773 181 51ms 23 May 2025 702nd DialFrost 🇸🇬 772 80 184ms 5 Aug 2024 703rd dokutan 772 95 60ms 23 Mar 2024 704th dokutan 770 54 282ms 9 Apr 2024 704th snoozingnewt 🇨🇦 770 54 225ms 9 Dec 2025 706th emplv 🇱🇻 769 61 7ms 21 Jun 2023 707th Yewzir 🇧🇪 769 68 149ms 14 Feb 2024 708th ovs-code 🇩🇪 768 69 5ms 10 Feb 2024 709th SirFireball3521 767 37 187ms 13 Mar 2023 710th fourth-bit 764 65 20ms 11 Jul 2023 710th Bmrl7 764 65 19ms 24 Feb 2024 710th shelerr 764 65 24ms 22 Aug 2025 713th Irratix 🇳🇱 764 96 65ms 11 Dec 2022 714th Steffan153 🇫🇮 763 77 41ms 20 Feb 2026 715th AlephSquirrel 762 58 124ms 1 Jun 2023 716th JGDoerrer 761 90 127ms 20 Dec 2022 716th klixel 🇨🇦 761 90 124ms 17 Apr 2023 716th TylerBloom 761 90 124ms 22 Mar 2024 716th Aurel300 🇨🇭 761 90 123ms 8 Jun 2024 720th steffan-polygolf 760 60 447ms 7 Mar 2024 First Prev 641–720 of 1,870 Next Last