The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?
Farey Sequence 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 718th Bmrl7 623 90 12ms 24 Dec 2025 722nd Babafaba 621 86 412ms 22 Oct 2025 723rd two-bad 🇬🇧 621 93 13ms 5 Feb 2024 723rd helbling 🇨🇭 621 93 14ms 16 Jun 2024 723rd snoozingnewt 🇨🇦 621 93 12ms 15 Oct 2025 726th iczelia 🇩🇪 621 104 2ms 10 Oct 2025 727th SirBogman 🇺🇸 620 68 289ms 18 May 2024 728th MeWhenI 🇻🇦 618 105 17ms 1 Dec 2023 729th msbranicky 618 154 25ms 3 Jan 2024 730th agreegious 616 91 11ms 17 Nov 2024 730th ahmetdemirag 🇨🇾 616 91 12ms 1 Feb 2026 732nd Lydxn 🇨🇦 616 123 414ms 16 Dec 2023 733rd Shanethegamer 🇺🇸 614 68 39ms 1 Dec 2023 734th Andrey-Plotnikov 614 94 11ms 13 Jan 2025 735th bac0id 614 139 446ms 10 Jan 2025 736th dokutan 614 155 25ms 20 Apr 2025 737th Maximizer02 613 113 12ms 7 Nov 2024 738th denkyuu1 610 79 725ms 2 days ago 739th dokutan 609 86 132ms 29 Oct 2024 740th Matter1024 🇮🇳 609 92 11ms 14 hours ago 741st FortuiteMan 🇫🇷 608 96 13ms 18 Dec 2025 742nd uttumuttu 🇫🇮 608 101 91ms 21 Dec 2023 743rd dokutan 607 94 1,164ms 23 Sep 2025 744th msbranicky 606 116 92ms 2 Jan 2024 745th h3ra993huskp 🇯🇵 606 125 466ms 30 Nov 2025 746th annaproxy 604 107 2ms 20 Dec 2023 747th dokutan 604 134 452ms 27 Sep 2025 748th emgordon154 603 48 3ms 9 days ago 749th msbranicky 603 235 1,619ms 16 Sep 2025 750th dcgjb 602 70 1,057ms 25 Mar 2024 751st dokutan 602 113 118ms 31 Oct 2024 752nd Yewzir 🇧🇪 601 96 12ms 5 Feb 2024 752nd dokutan 601 96 10ms 15 Jun 2025 754th Yewzir 🇧🇪 599 135 479ms 5 Feb 2024 755th dokutan 598 237 1,728ms 19 Oct 2025 756th Natanaelel 🇸🇪 597 122 137ms 22 Mar 2024 757th mikehanus 596 94 12ms 5 Dec 2023 757th eiburns 596 94 12ms 13 Dec 2023 757th msbranicky 596 94 12ms 1 Jan 2024 757th InigoK 🇺🇸 596 94 11ms 29 Aug 2025 761st MeWhenI 🇻🇦 594 71 265ms 1 Dec 2023 762nd commandz0 🇺🇸 593 90 479ms 15 Jan 2024 762nd HumanoidCPU 593 90 447ms 5 Jun 2024 764th emgordon154 593 126 12ms 2 Jan 2025 765th dokutan 593 144 61ms 30 Mar 2025 766th dokutan 592 106 2ms 12 Nov 2025 767th Yewzir 🇧🇪 592 115 110ms 5 Feb 2024 768th dokutan 592 128 387ms 21 Feb 2026 769th dokutan 591 119 103ms 31 Mar 2025 770th JOrE20 591 161 27ms 14 Feb 2026 771st janbehrens 🇩🇪 590 95 11ms 1 Dec 2023 771st wuzekai518 590 95 11ms 16 Jul 2024 771st CoolBvll 590 95 12ms 13 Jun 2025 771st Techdude01 590 95 11ms 14 Aug 2025 775th janbehrens 🇩🇪 590 137 430ms 22 Dec 2023 776th janbehrens 🇩🇪 589 145 65ms 22 Dec 2023 777th HumanoidCPU 588 164 274ms 26 Aug 2024 778th msbranicky 587 112 2ms 2 Jan 2024 779th arctouch-cristiannevianna 586 125 393ms 19 Feb 2024 780th dokutan 584 128 4ms 14 Feb 2026 781st Yewzir 🇧🇪 583 130 373ms 2 Oct 2025 782nd Jonatan6 🇩🇰 582 111 2ms 27 Apr 2024 782nd dokutan 582 111 2ms 30 Mar 2025 784th MeWhenI 🇻🇦 580 132 3ms 1 Dec 2023 785th coreynash 577 100 12ms 14 Jul 2024 786th Jonatan6 🇩🇰 577 148 61ms 27 Apr 2024 787th dokutan 574 84 657ms 9 Apr 2024 788th snoozingnewt 🇨🇦 574 141 469ms 15 Oct 2025 789th bac0id 572 98 11ms 10 Jan 2025 789th Troon 572 98 11ms 18 Feb 2025 791st c0d3-4-F00d 🇩🇪 572 113 2ms 4 Dec 2023 791st bac0id 572 113 2ms 10 Jan 2025 793rd snoozingnewt 🇨🇦 572 115 2ms 15 Oct 2025 794th steffan-polygolf 570 131 4ms 29 Feb 2024 795th ethanlally 570 133 458ms 14 Nov 2025 795th snoozingnewt 🇨🇦 570 133 497ms 5 Dec 2025 797th rboath 569 108 94ms 17 Dec 2024 798th brimstonetrader 569 128 130ms 23 Feb 2024 799th snoozingnewt 🇨🇦 569 150 436ms 15 Oct 2025 800th msbranicky 568 94 436ms 17 Jan 2024 First Prev 721–800 of 1,533 Next Last