The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
√2 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 641st edsrzf 🇳🇿 823 94 258ms 9 Jun 2025 642nd inventshah 821 65 1,306ms 27 Sep 2023 643rd emgordon154 818 93 481ms 30 May 2025 644th DialFrost 🇸🇬 817 39 1,391ms 2 Sep 2025 645th Sp3000 🇦🇺 816 35 12ms 28 May 2021 646th guliyevemil1 🇦🇿 816 59 12ms 16 Apr 2020 646th milotoor 816 59 12ms 18 Apr 2020 646th yishayv 816 59 9ms 23 Jan 2023 646th falsidge 816 59 9ms 5 Jul 2023 646th gussy420 816 59 10ms 23 Oct 2023 646th namelessiw 816 59 20ms 6 Dec 2023 646th piano-miles 816 59 12ms 31 Dec 2023 646th wuzekai518 816 59 24ms 21 Jun 2024 646th mohammad-sayed-ahmad 816 59 13ms 21 Jul 2024 646th jatloe 816 59 18ms 27 Sep 2024 646th agreegious 816 59 83ms 16 Mar 2025 646th solisolu 816 59 18ms 30 Jan 2026 646th Ultra814 816 59 10ms 12 days ago 659th j-Ewan 814 112 291ms 15 Mar 2022 660th flawr 813 73 112ms 19 Jul 2019 660th annaproxy 813 73 124ms 18 Aug 2022 662nd Shanethegamer 🇺🇸 812 42 34ms 28 Jan 2022 662nd Natanaelel 🇸🇪 812 42 36ms 28 Dec 2022 662nd emgordon154 812 42 36ms 19 Jan 2025 665th didion0 🇺🇸 810 62 30ms 11 Feb 2022 665th alexsave 810 62 11ms 3 Jan 2026 667th Yax42 🇫🇷 809 105 422ms 25 Dec 2024 667th AdrienHache 🇫🇷 809 105 531ms 12 Aug 2025 669th jerrandolph 807 113 296ms 22 Oct 2023 670th SirBogman 🇺🇸 806 31 85ms 3 Oct 2022 670th betaveros 806 31 100ms 4 Jan 2023 672nd sean-niemann 🇺🇸 805 168 147ms 8 Jun 2025 673rd Yewzir 🇧🇪 804 57 400ms 4 Feb 2024 674th glassala 802 60 12ms 25 Dec 2024 675th Jeremy-Stafford 802 74 144ms 28 Feb 2023 676th edsrzf 🇳🇿 802 105 175ms 6 Dec 2025 677th chunes3 🇺🇸 800 52 68ms 19 Sep 2023 678th fuzzylojik-golf 🇺🇸 797 40 1,470ms 14 Sep 2025 678th snoozingnewt 🇨🇦 797 40 1,017ms 22 Oct 2025 680th dokutan 797 43 7ms 25 Feb 2026 681st AlephSquirrel 797 63 11ms 15 Nov 2021 681st gigaprofisi 🇺🇸 797 63 10ms 1 Sep 2025 681st Yax42 🇫🇷 797 63 10ms 5 Sep 2025 684th Steffan153 🇫🇮 794 54 5ms 29 Aug 2024 684th AlephSquirrel 794 54 5ms 3 Oct 2024 686th Herbert00709 🇵🇱 794 128 12ms 8 Jun 2024 687th Mukundan314 793 43 35ms 16 Apr 2025 687th csharpython 793 43 35ms 24 Aug 2025 687th anter69 🇭🇺 793 43 36ms 8 Jan 2026 690th lifthrasiir 🇰🇷 793 316 3,544ms 15 Dec 2024 691st DialFrost 🇸🇬 792 157 1,716ms 18 Jan 2026 692nd MeWhenI 🇻🇦 791 59 372ms 14 Jul 2024 693rd Waffle3z 789 61 181ms 24 Jul 2021 693rd tomtheisen 🇺🇸 789 61 15ms 29 Jan 2023 693rd fgrosshans 🇫🇷 789 61 21ms 3 May 2023 696th SirBogman 🇺🇸 787 78 1,417ms 4 Jan 2022 697th DialFrost 🇸🇬 787 93 134ms 23 Mar 2025 698th 52525rr 784 64 9ms 12 Jun 2025 698th Lv0Sys 🇵🇱 784 64 26ms 2 Dec 2025 700th varhammer 780 55 4ms 20 Aug 2021 700th fuzzylojik-golf 🇺🇸 780 55 5ms 12 Aug 2025 702nd DialFrost 🇸🇬 779 109 634ms 22 Jul 2025 703rd mpldr 🇩🇪 779 117 300ms 26 Nov 2023 704th primo-ppcg 🇹🇭 779 133 76ms 11 Dec 2025 705th namelessiw 777 59 451ms 5 Mar 2024 706th glesnick 776 62 24ms 18 Aug 2022 707th PatrickStephansen 🇿🇦 772 65 40ms 5 Mar 2021 708th billings7 🇬🇧 772 110 408ms 21 Nov 2021 709th primo-ppcg 🇹🇭 771 37 48ms 6 Dec 2020 710th KasperKivimaeki 🇫🇮 768 135 493ms 20 Nov 2025 710th sean-niemann 🇺🇸 768 135 76ms 23 Dec 2025 712th SirBogman 🇺🇸 765 61 320ms 9 Jun 2020 713th namelessiw 765 111 427ms 30 Jul 2024 714th Secozzi 764 63 13ms 4 Nov 2020 714th georgehulme 764 63 12ms 28 Jan 2022 714th cyxv 764 63 14ms 30 Jun 2022 714th Herbert00709 🇵🇱 764 63 20ms 6 May 2024 714th ei14 764 63 71ms 7 May 2024 714th LostSyntax21 🇬🇧 764 63 13ms 25 Sep 2024 714th DraigRygbi 764 63 12ms 19 Dec 2024 First Prev 641–720 of 2,925 Next Last