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 721st lynn 759 102 30ms 18 Jul 2023 721st m-tkach 🇺🇦 759 102 31ms 7 Dec 2023 723rd DialFrost 🇸🇬 758 69 163ms 19 Dec 2025 724th janbehrens 🇩🇪 757 52 44ms 27 Nov 2022 725th SirBogman 🇺🇸 756 41 372ms 9 Jan 2024 725th dcgjb 756 41 1,752ms 31 Jan 2024 725th IISResetMe 756 41 339ms 10 Apr 2024 725th juliansiebert 🇩🇪 756 41 347ms 2 Feb 2025 729th Alex-x90 🇺🇸 756 97 64ms 20 Nov 2022 730th aksyristos 753 66 19ms 17 Jan 2023 730th OllieBoyne 🇬🇧 753 66 20ms 28 Feb 2023 730th randolchance 753 66 20ms 12 Mar 2023 730th CheeseCake628 🇳🇴 753 66 21ms 19 Mar 2023 730th adamnielson42 🇺🇸 753 66 18ms 31 Mar 2023 730th ehulinsky 🇺🇸 753 66 20ms 8 May 2023 730th MeWhenI 🇻🇦 753 66 41ms 14 May 2023 730th TheoKeller1 753 66 18ms 11 Jun 2023 730th dranjohn 753 66 18ms 11 Sep 2023 730th inverseLorentz 🇦🇺 753 66 20ms 23 Oct 2023 730th RedzGoose 🇦🇺 753 66 19ms 23 Oct 2024 730th JunkIce 753 66 21ms 24 Nov 2024 730th yokasuretsu 753 66 18ms 7 Jan 2025 730th croc54 753 66 19ms 13 Jan 2025 730th ejini6969 753 66 18ms 14 Jun 2025 730th osNiko 🇧🇷 753 66 18ms 20 Aug 2025 730th Troon 753 66 23ms 22 Aug 2025 747th GrayJoKing 🇦🇺 753 78 43ms 13 Aug 2023 748th prestosilver 🇺🇸 752 76 375ms 39 hours ago 749th Yewzir 🇧🇪 751 90 467ms 12 Feb 2024 749th dokutan 751 90 432ms 15 Feb 2026 751st dokutan 750 32 3ms 14 Nov 2024 752nd retrohun 750 64 4,085ms 5 Nov 2023 753rd Shanethegamer 🇺🇸 750 81 1,318ms 30 Nov 2022 754th inventshah 749 59 12ms 20 Nov 2022 754th Argeento 🇵🇱 749 59 12ms 26 Aug 2023 754th DialFrost 🇸🇬 749 59 24ms 19 Dec 2025 754th error256 749 59 12ms 24 Dec 2025 758th tigerdan2 🇩🇪 748 92 503ms 30 Nov 2025 759th MeWhenI 🇻🇦 748 98 65ms 9 Apr 2024 759th snoozingnewt 🇨🇦 748 98 416ms 6 Oct 2025 761st Natanaelel 🇸🇪 747 38 176ms 5 Jan 2024 762nd m-tkach 🇺🇦 747 106 44ms 13 Mar 2023 763rd GolfingSuccess 🇬🇷 747 108 118ms 11 days ago 764th MostParsingVex 746 71 4ms 8 hours ago 765th Yewzir 🇧🇪 745 72 27ms 6 Mar 2024 766th msbranicky 745 92 121ms 1 Oct 2023 767th janbehrens 🇩🇪 745 116 286ms 20 Nov 2022 768th janbehrens 🇩🇪 744 63 14ms 20 Nov 2022 769th Kaffeleif 744 71 23ms 8 Feb 2024 769th snoozingnewt 🇨🇦 744 71 27ms 9 Oct 2025 771st GolfingSuccess 🇬🇷 743 79 31ms 11 days ago 772nd dokutan 743 92 26ms 24 Nov 2025 773rd bob-th 741 67 19ms 23 Dec 2022 773rd n0Oo0Oo0b 741 67 18ms 29 Dec 2022 773rd betaveros 741 67 31ms 31 Dec 2022 773rd vgamula 🇺🇦 741 67 18ms 15 Mar 2023 773rd HumanoidCPU 741 67 22ms 19 Feb 2025 773rd VictorStenvers 🇳🇱 741 67 18ms 26 Mar 2025 779th janbehrens 🇩🇪 741 99 62ms 20 Nov 2022 779th Yewzir 🇧🇪 741 99 56ms 12 Feb 2024 781st Steffan153 🇫🇮 738 65 1,411ms 14 Jan 2023 782nd thisishowmymindworks 🇳🇴 737 60 13ms 19 Jun 2024 782nd stefangimmillaro 737 60 12ms 4 Sep 2024 782nd targrik 737 60 13ms 6 Feb 2025 785th m-tkach 🇺🇦 736 72 4ms 22 Nov 2022 785th emplv 🇱🇻 736 72 4ms 30 Nov 2022 785th Steffan153 🇫🇮 736 72 4ms 3 Jan 2023 785th sean-niemann 🇺🇸 736 72 5ms 7 May 2024 785th solisolu 736 72 4ms 19 Nov 2025 790th DialFrost 🇸🇬 736 84 45ms 30 Dec 2025 791st rucin93 🇵🇱 735 63 8ms 18 Nov 2025 792nd snoozingnewt 🇨🇦 733 118 299ms 9 Oct 2025 793rd h3ra993huskp 🇯🇵 732 94 476ms 30 Nov 2025 794th MaxElf999 731 68 18ms 21 Nov 2022 794th guilhem-roy 🇫🇷 731 68 20ms 21 Nov 2022 794th knutae 🇳🇴 731 68 17ms 30 Nov 2022 794th 4ndyJ 🇬🇧 731 68 17ms 10 Jan 2023 794th andre-lameirinhas 🇵🇹 731 68 18ms 18 May 2023 794th WillConker 731 68 18ms 16 Jul 2023 794th AforAmpere 731 68 17ms 20 Sep 2023 First Prev 721–800 of 1,868 Next Last