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?
√2 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 826th firegene 🇮🇪 705 68 12ms 24 Nov 2023 826th m42km 705 68 12ms 8 Dec 2023 826th epic-programmer-guy 705 68 12ms 17 Dec 2023 826th smokestacklightnin 🇺🇸 705 68 12ms 29 Dec 2023 826th Dataen 705 68 13ms 12 Jan 2024 826th scpchicken 🇵🇼 705 68 12ms 1 Feb 2024 826th Just4FunCoder 705 68 12ms 26 Feb 2024 826th sultan 705 68 12ms 9 Mar 2024 826th stertooy 🇧🇪 705 68 13ms 11 Jun 2024 826th codingisgreatbutiamnot 705 68 11ms 14 Jul 2024 826th voytxt 🇨🇿 705 68 12ms 13 Sep 2024 826th starfihs 705 68 12ms 26 Feb 2025 826th gigaprofisi 🇺🇸 705 68 12ms 2 Mar 2025 826th 0dyse 705 68 13ms 29 Apr 2025 826th codewrite 🇬🇧 705 68 13ms 7 May 2025 826th Voltrifrodec 🇸🇰 705 68 12ms 14 May 2025 826th JOrE-Softwares 705 68 11ms 21 May 2025 826th BenjaminHGong 705 68 13ms 23 May 2025 826th sainiayush 705 68 13ms 14 Jul 2025 826th GoldStar184 705 68 13ms 17 Jul 2025 826th cthierfelder 🇲🇨 705 68 12ms 7 Aug 2025 826th muser-logiccpu 🇺🇦 705 68 12ms 9 Aug 2025 826th Andrey2001 705 68 13ms 15 Dec 2025 826th JOrE20 705 68 13ms 25 Dec 2025 826th JesseNoEyes 🇺🇸 705 68 12ms 20 Jan 2026 826th netfri25 🇮🇱 705 68 12ms 14 Feb 2026 826th Aquateraneal 🇺🇸 705 68 12ms 19 Feb 2026 908th Schmitt-Very-Cool 703 87 473ms 3 Oct 2025 908th raphaelimahorn 703 87 400ms 13 days ago 910th SirFireball3521 702 40 101ms 1 Mar 2023 911th owen-c-parker 🇺🇸 702 71 29ms 31 Mar 2023 911th Protothor 702 71 24ms 9 Jul 2025 911th iczelia 🇩🇪 702 71 24ms 10 Oct 2025 914th BrenSchaap 701 48 36ms 12 Nov 2021 914th jared-hughes 701 48 36ms 20 Jan 2023 914th DialFrost 🇸🇬 701 48 75ms 27 Dec 2024 917th LHLaurini 🇧🇷 701 84 119ms 5 Jul 2024 918th ovs-code 🇩🇪 698 104 123ms 13 Oct 2022 918th MeWhenI 🇻🇦 698 104 186ms 14 Oct 2022 920th jmhowl 695 69 14ms 19 Jan 2020 920th cmdrsabre 695 69 13ms 30 Jan 2020 920th artyom-razinov 695 69 11ms 13 Feb 2020 920th HemangRajvanshy 695 69 12ms 1 Apr 2020 920th msrawson 695 69 11ms 14 May 2020 920th PyPylia 🇦🇺 695 69 13ms 7 Aug 2020 920th billylanchantin 695 69 12ms 23 Aug 2020 920th magnickolas 695 69 12ms 29 Aug 2020 920th WillowBee7 695 69 12ms 28 Sep 2020 920th ralsei 695 69 13ms 6 Oct 2020 920th jdrouvin 695 69 12ms 2 Dec 2020 920th befoster 695 69 10ms 10 Apr 2021 920th StHagel 695 69 12ms 7 May 2021 920th 8Bit1Byte 695 69 13ms 20 Jun 2021 920th Fmbalbuena 695 69 13ms 17 Sep 2021 920th Ted-Barrett 🇦🇺 695 69 12ms 29 Sep 2021 920th forlack 695 69 13ms 8 Nov 2021 920th shibacho 🇯🇵 695 69 12ms 27 Nov 2021 920th pecholsjones 695 69 12ms 12 Dec 2021 920th CuboidRaptor 🇨🇦 695 69 12ms 3 Apr 2022 920th MakkCH 695 69 12ms 24 Apr 2022 920th bonevbs 695 69 12ms 20 Nov 2022 920th KevinLyvers 695 69 13ms 13 Dec 2022 920th jtaxen 695 69 12ms 4 Jan 2023 920th SucukMitEi 695 69 12ms 7 Jan 2023 920th atazzam 🇺🇸 695 69 12ms 5 Mar 2023 920th DrPiranoid 695 69 12ms 26 Mar 2023 920th Hortaros 695 69 13ms 15 Apr 2023 920th XioR112 🇵🇱 695 69 12ms 29 Aug 2023 920th jameswmccarty 695 69 12ms 6 Jun 2024 920th dtbao20 🇻🇳 695 69 12ms 8 Oct 2024 920th sciencedjinn 695 69 13ms 8 Nov 2024 920th Unknownuserfrommars 695 69 11ms 21 Nov 2024 920th yokasuretsu 695 69 10ms 31 Dec 2024 920th clayboll99 695 69 12ms 10 Jul 2025 955th janbehrens 🇩🇪 693 72 42ms 30 Dec 2023 955th emgordon154 693 72 88ms 4 Aug 2024 957th SmartK8 🇨🇿 692 122 465ms 1 Nov 2022 957th tomh1012 692 122 426ms 8 Sep 2025 959th MeWhenI 🇻🇦 690 29 581ms 25 Jul 2022 959th lifthrasiir 🇰🇷 690 29 55ms 5 Dec 2024 First Prev 881–960 of 2,894 Next Last
