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 (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 mbittner20 703 72 17ms 27 May 2023 881st eiburns 703 72 19ms 27 Oct 2023 881st WillowWispy 703 72 17ms 14 Mar 2025 884th yzhs 🇩🇪 702 88 195ms 26 Jun 2023 885th Yewzir 🇧🇪 701 80 111ms 12 Feb 2024 886th dokutan 700 71 42ms 18 Nov 2025 887th kevinnaviapaiva 700 78 24ms 2 Feb 2026 888th janbehrens 🇩🇪 699 92 415ms 17 Apr 2025 888th MeWhenI 🇻🇦 699 92 382ms 19 Jun 2025 890th tatzyr 🇯🇵 698 59 54ms 17 Nov 2024 890th ejini6969 698 59 59ms 14 Jun 2025 892nd Shanethegamer 🇺🇸 697 77 53ms 30 Nov 2022 893rd msbranicky 693 60 329ms 15 Jan 2024 893rd alemelis 693 60 422ms 29 Aug 2024 895th MeWhenI 🇻🇦 693 100 478ms 9 Apr 2024 896th Florian-Mt 692 99 129ms 12 Jul 2024 897th voytxt 🇨🇿 691 64 14ms 21 Jul 2023 898th Steffan153 🇫🇮 691 74 10ms 11 Feb 2026 899th MeWhenI 🇻🇦 691 78 4ms 9 Apr 2024 900th dokutan 691 129 287ms 10 Mar 2025 901st prplz 🇦🇺 685 113 31ms 31 Dec 2022 902nd CaedenHarper 🇨🇦 685 130 273ms 3 Dec 2024 903rd Anthony-Williams-06 684 74 18ms 12 Sep 2024 904th steffan-polygolf 684 77 81ms 24 Feb 2023 905th annaproxy 684 94 409ms 22 Oct 2023 906th janbehrens 🇩🇪 682 79 4ms 20 Nov 2022 906th weliveinhell 🇭🇹 682 79 4ms 21 May 2024 908th Yewzir 🇧🇪 681 73 40ms 24 Feb 2024 909th weliveinhell 🇭🇹 680 65 16ms 15 Sep 2023 909th dylanarmstrong 680 65 13ms 25 Jan 2024 909th Yewzir 🇧🇪 680 65 21ms 12 Feb 2024 912th Yewzir 🇧🇪 680 69 7ms 13 Feb 2024 913th msbranicky 680 76 2,565ms 6 Jan 2025 914th snoozingnewt 🇨🇦 680 102 464ms 9 Oct 2025 915th kkoenig 680 131 280ms 2 Jan 2024 916th snoozingnewt 🇨🇦 679 52 5ms 9 Oct 2025 917th MeWhenI 🇻🇦 679 77 152ms 9 Apr 2024 918th AlephSquirrel 678 97 6ms 5 Aug 2024 919th angel-p57 🇯🇵 678 215 291ms 11 Dec 2023 920th MeWhenI 🇻🇦 678 245 442ms 19 Apr 2025 921st CatsAreFluffy 677 57 50ms 31 Jan 2023 922nd epic-programmer-guy 677 70 533ms 15 Apr 2024 922nd Stockoh 🇫🇷 677 70 743ms 24 Jun 2024 924th lacrosse 675 61 46ms 28 Nov 2025 925th CedricGebistorf 675 75 25ms 4 May 2023 925th namelessiw 675 75 26ms 11 Jan 2024 927th emgordon154 675 87 35ms 19 Mar 2025 928th gjoacorp 🇬🇧 672 109 61ms 4 Aug 2025 929th MeWhenI 🇻🇦 672 171 1,690ms 7 Nov 2025 930th helbling 🇨🇭 670 66 14ms 5 Apr 2024 930th snoozingnewt 🇨🇦 670 66 17ms 30 Dec 2025 932nd Steffan153 🇫🇮 668 71 5ms 20 Nov 2022 933rd jacksonhenry3 666 76 24ms 2 Dec 2022 933rd Irratix 🇳🇱 666 76 24ms 31 Jan 2023 933rd NoahBolohan 🇨🇦 666 76 26ms 8 Feb 2023 933rd Andrey2001 666 76 25ms 9 Dec 2025 933rd Pyroan 666 76 25ms 22 Jan 2026 938th MeWhenI 🇻🇦 666 79 96ms 7 Aug 2023 939th namcartoon06 666 110 63ms 15 Jul 2023 940th snoozingnewt 🇨🇦 665 48 142ms 9 Oct 2025 941st Yewzir 🇧🇪 665 81 5ms 12 Feb 2024 941st dokutan 665 81 4ms 23 Mar 2024 943rd SirBogman 🇺🇸 661 51 1,187ms 22 Nov 2022 943rd janbehrens 🇩🇪 661 51 1,216ms 27 Nov 2022 945th dokutan 661 70 8ms 19 Nov 2025 946th snoozingnewt 🇨🇦 661 71 7ms 9 Oct 2025 947th Steffan153 🇫🇮 661 251 53ms 2 Aug 2023 948th Codsilla 🇨🇦 660 63 291ms 3 Nov 2023 948th Daniel-Ellison 660 63 372ms 11 Feb 2026 950th fuzzylojik-golf 🇺🇸 660 67 43ms 9 Jul 2025 950th JOrE20 660 67 53ms 5 Feb 2026 952nd msbranicky 658 80 84ms 10 Sep 2023 953rd jakobkordez 🇸🇮 657 77 2,257ms 20 Nov 2022 954th dokutan 656 98 396ms 2 Dec 2025 955th dokutan 656 103 83ms 23 Feb 2026 956th SirBogman 🇺🇸 656 253 79ms 22 Nov 2022 957th albanian-laundromat 655 192 1,485ms 20 Oct 2025 958th BREMAUCY 🇫🇷 654 63 41ms 15 Apr 2024 958th TheZwierzLF 🇵🇱 654 63 48ms 21 Dec 2025 960th aksyristos 654 112 62ms 23 Jan 2023 First Prev 881–960 of 1,884 Next Last