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 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 27 Feb 2026 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 13ms 26 Feb 2026 581st ian-h-chamberlain 🇺🇸 815 84 116ms 16 Dec 2025 581st JOrE20 815 84 25ms 10 Feb 2026 581st emgordon154 815 84 27ms 5 hours ago 584th Natanaelel 🇸🇪 814 51 74ms 26 Sep 2023 585th KatieLG 🇬🇧 814 56 384ms 28 Oct 2024 586th Eilonlif 🇮🇱 814 61 19ms 9 Dec 2022 586th SirFireball3521 814 61 18ms 9 Mar 2023 586th minhtrancccp 814 61 20ms 11 Jan 2024 586th stertooy 🇧🇪 814 61 17ms 14 Jun 2024 590th janbehrens 🇩🇪 814 83 462ms 20 Nov 2022 590th emgordon154 814 83 484ms 8 Feb 2026 592nd Steffan153 🇫🇮 813 66 48ms 16 Jan 2023 592nd CLOStrophobic 🇮🇹 813 66 54ms 3 Mar 2025 592nd GolfingSuccess 🇬🇷 813 66 49ms 14 days ago 595th MeWhenI 🇻🇦 812 155 1,440ms 28 Mar 2025 596th Steffan153 🇫🇮 811 35 264ms 23 Nov 2022 597th madex 🇩🇪 807 64 2,612ms 11 days ago 598th rucin93 🇵🇱 807 156 1,466ms 20 Mar 2025 599th GrayJoKing 🇦🇺 805 66 34ms 1 Nov 2023 600th MichalMarsalek 🇨🇿 805 71 148ms 16 Dec 2022 601st frankgraziano 805 84 30ms 23 Feb 2026 602nd dokutan 804 49 49ms 30 Apr 2024 603rd emplv 🇱🇻 804 55 17ms 21 Nov 2022 603rd dmrichwa 🇺🇸 804 55 13ms 14 Jan 2023 603rd rucin93 🇵🇱 804 55 13ms 2 Aug 2024 603rd vlpx 🇫🇮 804 55 13ms 23 Sep 2024 603rd sean-niemann 🇺🇸 804 55 16ms 18 Jan 2025 608th rhdqor213 803 66 5ms 6 Oct 2023 609th Yewzir 🇧🇪 802 79 373ms 13 Feb 2024 610th suwat513 801 62 17ms 6 Dec 2022 610th StefanHabel 🇨🇦 801 62 17ms 19 Dec 2022 610th Ripick 801 62 17ms 1 Feb 2023 610th quimey 801 62 17ms 8 Mar 2023 610th Andriamanitra 🇫🇮 801 62 18ms 17 Jul 2023 610th Re-Adventures 🇮🇳 801 62 18ms 20 Jul 2023 610th fkantelberg 801 62 18ms 12 Aug 2023 610th Mikey-Beep 🇬🇧 801 62 17ms 23 Aug 2023 610th htareque 801 62 18ms 13 Oct 2023 610th BREMAUCY 🇫🇷 801 62 18ms 14 May 2024 610th ahmetdemirag 🇨🇾 801 62 18ms 25 Jun 2024 610th cros107 🇦🇺 801 62 25ms 27 Jun 2024 610th codingisgreatbutiamnot 801 62 17ms 6 Aug 2024 610th tjwrenn 801 62 17ms 6 Dec 2024 624th primo-ppcg 🇹🇭 801 67 56ms 20 Nov 2022 625th Yewzir 🇧🇪 801 86 377ms 2 Oct 2025 626th ashtraypettingzoo 🇺🇸 800 30 9ms 3 Apr 2023 626th snoozingnewt 🇨🇦 800 30 9ms 19 Sep 2025 628th Steffan153 🇫🇮 799 76 1,305ms 14 Jan 2023 629th sean-niemann 🇺🇸 797 55 170ms 19 May 2025 630th Yewzir 🇧🇪 797 142 1,847ms 14 Nov 2025 631st Shanethegamer 🇺🇸 796 158 1,688ms 29 May 2025 632nd emgordon154 795 56 56ms 6 Jun 2025 633rd stefangimmillaro 795 59 28ms 20 Nov 2022 634th snoozingnewt 🇨🇦 795 65 2,562ms 27 Sep 2025 635th inventshah 795 69 13ms 20 Nov 2022 636th msbranicky 794 72 141ms 1 Sep 2023 636th snoozingnewt 🇨🇦 794 72 148ms 9 Oct 2025 638th DialFrost 🇸🇬 793 67 35ms 1 Nov 2023 639th emplv 🇱🇻 793 109 295ms 21 Jun 2023 640th Steffan153 🇫🇮 792 78 4,183ms 10 Oct 2023 First Prev 561–640 of 1,870 Next Last