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 bytes. 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 Bytes Time Submitted 881st CaedenHarper 🇨🇦 705 99 600ms 3 Oct 2025 882nd mbittner20 703 72 17ms 27 May 2023 882nd eiburns 703 72 19ms 27 Oct 2023 882nd WillowWispy 703 72 17ms 14 Mar 2025 885th yzhs 🇩🇪 702 88 195ms 26 Jun 2023 886th Yewzir 🇧🇪 701 80 111ms 12 Feb 2024 887th dokutan 700 71 42ms 18 Nov 2025 888th kevinnaviapaiva 700 78 24ms 2 Feb 2026 889th janbehrens 🇩🇪 699 92 415ms 17 Apr 2025 889th MeWhenI 🇻🇦 699 92 382ms 19 Jun 2025 891st tatzyr 🇯🇵 698 59 54ms 17 Nov 2024 891st ejini6969 698 59 59ms 14 Jun 2025 893rd Shanethegamer 🇺🇸 697 77 53ms 30 Nov 2022 894th msbranicky 693 60 329ms 15 Jan 2024 894th alemelis 693 60 422ms 29 Aug 2024 896th MeWhenI 🇻🇦 693 100 478ms 9 Apr 2024 897th Florian-Mt 692 99 129ms 12 Jul 2024 898th voytxt 🇨🇿 691 64 15ms 21 Jul 2023 899th Steffan153 🇫🇮 691 74 10ms 11 Feb 2026 900th MeWhenI 🇻🇦 691 78 4ms 9 Apr 2024 901st dokutan 691 129 287ms 10 Mar 2025 902nd prplz 🇦🇺 685 113 31ms 31 Dec 2022 903rd CaedenHarper 🇨🇦 685 130 273ms 3 Dec 2024 904th Anthony-Williams-06 684 74 18ms 12 Sep 2024 905th steffan-polygolf 684 77 81ms 24 Feb 2023 906th annaproxy 684 94 409ms 22 Oct 2023 907th janbehrens 🇩🇪 682 79 4ms 20 Nov 2022 907th weliveinhell 🇭🇹 682 79 4ms 21 May 2024 909th Yewzir 🇧🇪 681 73 40ms 24 Feb 2024 910th weliveinhell 🇭🇹 680 65 15ms 15 Sep 2023 910th dylanarmstrong 680 65 16ms 25 Jan 2024 910th Yewzir 🇧🇪 680 65 15ms 12 Feb 2024 913th Yewzir 🇧🇪 680 69 7ms 13 Feb 2024 914th msbranicky 680 76 2,565ms 6 Jan 2025 915th snoozingnewt 🇨🇦 680 102 464ms 9 Oct 2025 916th kkoenig 680 131 280ms 2 Jan 2024 917th snoozingnewt 🇨🇦 679 52 5ms 9 Oct 2025 918th MeWhenI 🇻🇦 679 77 152ms 9 Apr 2024 919th AlephSquirrel 678 97 6ms 5 Aug 2024 920th angel-p57 🇯🇵 678 215 291ms 11 Dec 2023 921st MeWhenI 🇻🇦 678 245 442ms 19 Apr 2025 922nd CatsAreFluffy 677 57 50ms 31 Jan 2023 923rd epic-programmer-guy 677 70 533ms 15 Apr 2024 923rd Stockoh 🇫🇷 677 70 743ms 24 Jun 2024 925th lacrosse 675 61 46ms 28 Nov 2025 926th CedricGebistorf 675 75 25ms 4 May 2023 926th namelessiw 675 75 26ms 11 Jan 2024 928th emgordon154 675 87 35ms 19 Mar 2025 929th gjoacorp 🇬🇧 673 109 57ms 4 Aug 2025 930th MeWhenI 🇻🇦 672 171 1,690ms 7 Nov 2025 931st helbling 🇨🇭 670 66 17ms 5 Apr 2024 931st snoozingnewt 🇨🇦 670 66 16ms 30 Dec 2025 933rd Steffan153 🇫🇮 668 71 5ms 20 Nov 2022 934th namcartoon06 667 110 64ms 15 Jul 2023 935th jacksonhenry3 666 76 24ms 2 Dec 2022 935th Irratix 🇳🇱 666 76 24ms 31 Jan 2023 935th NoahBolohan 🇨🇦 666 76 26ms 8 Feb 2023 935th Andrey2001 666 76 25ms 9 Dec 2025 935th Pyroan 666 76 25ms 22 Jan 2026 940th MeWhenI 🇻🇦 666 79 96ms 7 Aug 2023 941st snoozingnewt 🇨🇦 665 48 142ms 9 Oct 2025 942nd Yewzir 🇧🇪 665 81 5ms 12 Feb 2024 942nd dokutan 665 81 4ms 23 Mar 2024 944th SirBogman 🇺🇸 661 51 1,187ms 22 Nov 2022 944th janbehrens 🇩🇪 661 51 1,216ms 27 Nov 2022 946th dokutan 661 70 8ms 19 Nov 2025 947th snoozingnewt 🇨🇦 661 71 7ms 9 Oct 2025 948th Steffan153 🇫🇮 661 251 53ms 2 Aug 2023 949th Codsilla 🇨🇦 660 63 291ms 3 Nov 2023 949th Daniel-Ellison 660 63 372ms 11 Feb 2026 951st fuzzylojik-golf 🇺🇸 660 67 45ms 9 Jul 2025 951st JOrE20 660 67 13ms 5 Feb 2026 953rd msbranicky 658 80 84ms 10 Sep 2023 954th jakobkordez 🇸🇮 657 77 2,257ms 20 Nov 2022 955th dokutan 656 98 396ms 2 Dec 2025 956th dokutan 656 103 83ms 23 Feb 2026 957th SirBogman 🇺🇸 656 253 79ms 22 Nov 2022 958th aksyristos 655 112 62ms 23 Jan 2023 959th albanian-laundromat 655 192 1,485ms 20 Oct 2025 960th BREMAUCY 🇫🇷 654 63 41ms 15 Apr 2024 First Prev 881–960 of 1,885 Next Last