The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 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 561st GolfingSuccess 🇬🇷 828 29 3ms 25 Feb 2023 561st 5cw 🇺🇸 828 29 5ms 10 Apr 2023 561st codereport 🇨🇦 828 29 2ms 17 May 2024 564th janbehrens 🇩🇪 828 60 26ms 20 Nov 2022 564th Omega65536 🇩🇪 828 60 18ms 24 Nov 2022 564th Fracture17 828 60 20ms 13 Apr 2023 564th bzijlema 🇳🇱 828 60 24ms 22 Jul 2024 564th bizy-coder 828 60 19ms 15 Aug 2024 564th firegene 🇮🇪 828 60 23ms 26 days ago 570th MeWhenI 🇻🇦 825 64 28ms 12 Dec 2023 570th emgordon154 825 64 24ms 10 Dec 2024 572nd jared-hughes 824 89 66ms 20 Nov 2022 572nd roupiq 🇵🇱 824 89 68ms 3 Jan 2024 572nd Herbert00709 🇵🇱 824 89 64ms 7 Jun 2024 572nd DialFrost 🇸🇬 824 89 62ms 17 Jun 2024 572nd KasperKivimaeki 🇫🇮 824 89 72ms 7 Dec 2025 577th Yax42 🇫🇷 823 77 480ms 21 Apr 2025 578th snoozingnewt 🇨🇦 822 52 876ms 31 Dec 2025 579th snoozingnewt 🇨🇦 820 48 48ms 23 Oct 2025 580th Lv0Sys 🇵🇱 819 54 17ms 26 days ago 581st ian-h-chamberlain 🇺🇸 815 84 121ms 16 Dec 2025 582nd Natanaelel 🇸🇪 814 51 74ms 26 Sep 2023 583rd KatieLG 🇬🇧 814 56 384ms 28 Oct 2024 584th Eilonlif 🇮🇱 814 61 19ms 9 Dec 2022 584th SirFireball3521 814 61 18ms 9 Mar 2023 584th minhtrancccp 814 61 20ms 11 Jan 2024 584th stertooy 🇧🇪 814 61 17ms 14 Jun 2024 588th janbehrens 🇩🇪 814 83 462ms 20 Nov 2022 588th emgordon154 814 83 484ms 8 Feb 2026 590th JOrE20 814 84 25ms 10 Feb 2026 591st Steffan153 🇫🇮 813 66 48ms 16 Jan 2023 591st CLOStrophobic 🇮🇹 813 66 54ms 3 Mar 2025 591st GolfingSuccess 🇬🇷 813 66 49ms 11 days ago 594th MeWhenI 🇻🇦 812 155 1,426ms 28 Mar 2025 595th Steffan153 🇫🇮 811 35 264ms 23 Nov 2022 596th madex 🇩🇪 807 64 2,612ms 9 days ago 597th rucin93 🇵🇱 807 156 1,431ms 20 Mar 2025 598th GrayJoKing 🇦🇺 805 66 34ms 1 Nov 2023 599th MichalMarsalek 🇨🇿 805 71 148ms 16 Dec 2022 600th frankgraziano 805 84 30ms 23 Feb 2026 601st dokutan 804 49 49ms 30 Apr 2024 602nd emplv 🇱🇻 804 55 13ms 21 Nov 2022 602nd dmrichwa 🇺🇸 804 55 12ms 14 Jan 2023 602nd rucin93 🇵🇱 804 55 15ms 2 Aug 2024 602nd vlpx 🇫🇮 804 55 13ms 23 Sep 2024 602nd sean-niemann 🇺🇸 804 55 12ms 18 Jan 2025 607th rhdqor213 803 66 5ms 6 Oct 2023 608th Yewzir 🇧🇪 802 79 373ms 13 Feb 2024 609th suwat513 801 62 17ms 6 Dec 2022 609th StefanHabel 🇨🇦 801 62 17ms 19 Dec 2022 609th Ripick 801 62 17ms 1 Feb 2023 609th quimey 801 62 17ms 8 Mar 2023 609th Andriamanitra 🇫🇮 801 62 18ms 17 Jul 2023 609th Re-Adventures 🇮🇳 801 62 18ms 20 Jul 2023 609th fkantelberg 801 62 18ms 12 Aug 2023 609th Mikey-Beep 🇬🇧 801 62 17ms 23 Aug 2023 609th htareque 801 62 18ms 13 Oct 2023 609th BREMAUCY 🇫🇷 801 62 18ms 14 May 2024 609th ahmetdemirag 🇨🇾 801 62 18ms 25 Jun 2024 609th cros107 🇦🇺 801 62 25ms 27 Jun 2024 609th codingisgreatbutiamnot 801 62 17ms 6 Aug 2024 609th tjwrenn 801 62 17ms 6 Dec 2024 623rd primo-ppcg 🇹🇭 801 67 56ms 20 Nov 2022 624th Yewzir 🇧🇪 801 86 377ms 2 Oct 2025 625th ashtraypettingzoo 🇺🇸 800 30 9ms 3 Apr 2023 625th snoozingnewt 🇨🇦 800 30 9ms 19 Sep 2025 627th Steffan153 🇫🇮 799 76 1,305ms 14 Jan 2023 628th sean-niemann 🇺🇸 797 55 170ms 19 May 2025 629th Yewzir 🇧🇪 797 142 1,847ms 14 Nov 2025 630th Shanethegamer 🇺🇸 796 158 1,432ms 29 May 2025 631st emgordon154 795 56 56ms 6 Jun 2025 632nd stefangimmillaro 795 59 28ms 20 Nov 2022 633rd snoozingnewt 🇨🇦 795 65 2,562ms 27 Sep 2025 634th inventshah 795 69 13ms 20 Nov 2022 635th msbranicky 794 72 141ms 1 Sep 2023 635th snoozingnewt 🇨🇦 794 72 148ms 9 Oct 2025 637th DialFrost 🇸🇬 793 67 35ms 1 Nov 2023 638th emplv 🇱🇻 793 109 295ms 21 Jun 2023 639th Steffan153 🇫🇮 792 78 4,183ms 10 Oct 2023 640th primo-ppcg 🇹🇭 791 60 2ms 20 Nov 2022 First Prev 561–640 of 1,868 Next Last