The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 days. Why not try and solve them ahead of time?
Farey Sequence 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 Shanethegamer 🇺🇸 705 73 1,270ms 1 Dec 2023 642nd Yewzir 🇧🇪 704 137 281ms 5 Jan 2024 643rd DialFrost 🇸🇬 702 60 323ms 16 Jul 2024 644th weliveinhell 🇭🇹 702 92 2ms 2 Dec 2023 645th agreegious 699 91 11ms 17 Nov 2024 645th ahmetdemirag 🇨🇾 699 91 12ms 1 Feb 2026 647th MeWhenI 🇻🇦 698 101 1,025ms 1 Dec 2023 648th KatieLG 🇬🇧 698 105 467ms 8 Jan 2026 649th saito-ta 🇯🇵 697 141 2,676ms 14 Dec 2023 650th albanian-laundromat 696 270 14ms 8 Dec 2025 651st Shanethegamer 🇺🇸 693 91 74ms 13 Dec 2024 652nd MeWhenI 🇻🇦 692 108 4ms 1 Dec 2023 653rd Babafaba 691 92 11ms 22 Oct 2025 653rd Matter1024 🇮🇳 691 92 11ms 2 days ago 655th Yewzir 🇧🇪 690 98 11ms 9 Jan 2025 656th msbranicky 689 140 301ms 1 Jan 2024 657th Yewzir 🇧🇪 688 83 1,179ms 5 Feb 2025 658th HumanoidCPU 688 124 58ms 5 Mar 2024 659th MateuszPietrzak 🇵🇱 687 94 2ms 7 Dec 2023 660th error256 686 75 1,251ms 11 Feb 2026 661st Yewzir 🇧🇪 686 79 1ms 26 May 2024 662nd HumanoidCPU 685 96 2ms 16 Nov 2025 663rd fantaize 685 111 125ms 18 days ago 664th tatzyr 🇯🇵 684 61 45ms 29 Dec 2024 665th keelimeguy 🇺🇸 684 93 12ms 14 Jun 2025 666th cyrilboyer 🇫🇷 684 141 282ms 14 Dec 2023 667th Shanethegamer 🇺🇸 683 90 85ms 1 Dec 2023 667th commandz0 🇺🇸 683 90 479ms 15 Jan 2024 669th SirFireball3521 682 64 142ms 13 Sep 2024 670th JohandeRuiter 🇳🇱 680 95 2ms 22 Jan 2025 671st mikehanus 677 94 12ms 5 Dec 2023 671st eiburns 677 94 12ms 13 Dec 2023 671st msbranicky 677 94 12ms 1 Jan 2024 671st InigoK 🇺🇸 677 94 11ms 29 Aug 2025 675th SirBogman 🇺🇸 676 54 36ms 1 Dec 2023 676th MeWhenI 🇻🇦 675 82 7ms 1 Dec 2023 677th the-zammers 674 108 129ms 15 Dec 2023 678th Shanethegamer 🇺🇸 673 106 14ms 31 Jan 2024 678th AlephSquirrel 673 106 11ms 24 Jun 2024 680th janbehrens 🇩🇪 670 95 11ms 1 Dec 2023 680th wuzekai518 670 95 11ms 16 Jul 2024 680th CoolBvll 670 95 12ms 13 Jun 2025 680th Techdude01 670 95 11ms 14 Aug 2025 684th kmathis22 670 113 533ms 6 Dec 2025 685th DialFrost 🇸🇬 669 101 11ms 12 Dec 2024 686th Babafaba 668 92 473ms 22 Oct 2025 687th Ripick 668 94 129ms 24 Jun 2024 688th janbehrens 🇩🇪 667 83 7ms 1 Dec 2023 689th Daniel-Ellison 665 75 487ms 26 days ago 690th HumanoidCPU 665 114 454ms 8 Nov 2025 691st NickTheEASDude 🇺🇸 664 87 13ms 25 Apr 2024 692nd BREMAUCY 🇫🇷 663 106 109ms 4 Dec 2023 693rd MichalMarsalek 🇨🇿 661 95 125ms 1 Dec 2023 694th luuumine 🇫🇷 659 98 2ms 19 Nov 2025 695th tobeannouncd 656 111 128ms 11 Jan 2024 696th MeWhenI 🇻🇦 654 191 7ms 1 Dec 2023 697th msbranicky 653 94 436ms 17 Jan 2024 698th MeWhenI 🇻🇦 650 84 5ms 16 Aug 2024 699th bac0id 649 98 11ms 10 Jan 2025 699th Troon 649 98 11ms 18 Feb 2025 699th JOrE20 649 98 11ms 22 Feb 2026 702nd dokutan 648 149 293ms 10 Dec 2024 703rd alomiF 644 113 152ms 6 Dec 2023 704th cyrilboyer 🇫🇷 644 118 118ms 19 Dec 2023 705th Ripick 643 99 12ms 1 Dec 2023 705th hellwue 643 99 11ms 22 Feb 2024 707th snoozingnewt 🇨🇦 643 150 281ms 15 Oct 2025 708th jbt 642 90 13ms 24 Dec 2023 708th JOrE20 642 90 11ms 27 Jan 2026 710th elgan65536 🇺🇸 640 101 2ms 5 Dec 2023 710th madex 🇩🇪 640 101 2ms 13 Feb 2024 710th Herbert00709 🇵🇱 640 101 2ms 3 Sep 2024 713th Yewzir 🇧🇪 639 92 150ms 27 Mar 2024 714th snoozingnewt 🇨🇦 639 110 93ms 15 Oct 2025 715th dokutan 638 106 11ms 30 Nov 2025 716th gifti258 637 99 69ms 8 Aug 2025 717th AstroOrbis 636 100 11ms 22 Feb 2026 718th janbehrens 🇩🇪 635 91 11ms 1 Dec 2023 718th eranws 635 91 12ms 16 Mar 2024 720th northsuperman 633 102 2ms 24 Mar 2024 First Prev 641–720 of 1,547 Next Last