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 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 719th HumanoidCPU 623 90 21ms 5 Jun 2024 719th Bmrl7 623 90 12ms 24 Dec 2025 723rd Babafaba 621 86 412ms 22 Oct 2025 724th two-bad 🇬🇧 621 93 13ms 5 Feb 2024 724th helbling 🇨🇭 621 93 14ms 16 Jun 2024 724th snoozingnewt 🇨🇦 621 93 12ms 15 Oct 2025 727th iczelia 🇩🇪 621 104 2ms 10 Oct 2025 728th SirBogman 🇺🇸 620 68 289ms 18 May 2024 729th msbranicky 619 154 25ms 3 Jan 2024 730th MeWhenI 🇻🇦 618 105 17ms 1 Dec 2023 731st agreegious 616 91 11ms 17 Nov 2024 731st ahmetdemirag 🇨🇾 616 91 12ms 1 Feb 2026 733rd Lydxn 🇨🇦 616 123 414ms 16 Dec 2023 734th dokutan 615 155 25ms 20 Apr 2025 735th Shanethegamer 🇺🇸 614 68 39ms 1 Dec 2023 736th Andrey-Plotnikov 614 94 11ms 13 Jan 2025 737th bac0id 614 139 446ms 10 Jan 2025 738th Maximizer02 613 113 12ms 7 Nov 2024 739th denkyuu1 610 79 725ms 4 days ago 740th dokutan 609 86 132ms 29 Oct 2024 741st Matter1024 🇮🇳 609 92 11ms 2 days ago 742nd FortuiteMan 🇫🇷 608 96 13ms 18 Dec 2025 743rd uttumuttu 🇫🇮 608 101 91ms 21 Dec 2023 744th dokutan 607 94 1,164ms 23 Sep 2025 745th msbranicky 606 116 92ms 2 Jan 2024 746th h3ra993huskp 🇯🇵 606 125 466ms 30 Nov 2025 747th annaproxy 604 107 2ms 20 Dec 2023 748th dokutan 604 134 452ms 27 Sep 2025 749th emgordon154 603 48 3ms 11 days ago 750th msbranicky 603 235 1,619ms 16 Sep 2025 751st dcgjb 602 70 1,057ms 25 Mar 2024 752nd Yewzir 🇧🇪 602 96 12ms 5 Feb 2024 752nd dokutan 602 96 10ms 15 Jun 2025 754th dokutan 602 113 118ms 31 Oct 2024 755th Yewzir 🇧🇪 599 135 479ms 5 Feb 2024 756th dokutan 598 237 1,728ms 19 Oct 2025 757th Natanaelel 🇸🇪 597 122 137ms 22 Mar 2024 758th mikehanus 596 94 12ms 5 Dec 2023 758th eiburns 596 94 12ms 13 Dec 2023 758th msbranicky 596 94 12ms 1 Jan 2024 758th InigoK 🇺🇸 596 94 11ms 29 Aug 2025 762nd MeWhenI 🇻🇦 594 71 265ms 1 Dec 2023 763rd commandz0 🇺🇸 593 90 479ms 15 Jan 2024 763rd HumanoidCPU 593 90 447ms 5 Jun 2024 765th emgordon154 593 126 12ms 2 Jan 2025 766th dokutan 593 144 61ms 30 Mar 2025 767th JOrE20 593 161 27ms 14 Feb 2026 768th dokutan 592 106 2ms 12 Nov 2025 769th Yewzir 🇧🇪 592 115 110ms 5 Feb 2024 770th dokutan 592 128 387ms 21 Feb 2026 771st dokutan 591 119 103ms 31 Mar 2025 772nd janbehrens 🇩🇪 590 95 11ms 1 Dec 2023 772nd wuzekai518 590 95 11ms 16 Jul 2024 772nd CoolBvll 590 95 12ms 13 Jun 2025 772nd Techdude01 590 95 11ms 14 Aug 2025 776th janbehrens 🇩🇪 590 137 430ms 22 Dec 2023 777th janbehrens 🇩🇪 589 145 65ms 22 Dec 2023 778th HumanoidCPU 588 164 274ms 26 Aug 2024 779th msbranicky 587 112 2ms 2 Jan 2024 780th arctouch-cristiannevianna 586 125 393ms 19 Feb 2024 781st dokutan 584 128 4ms 14 Feb 2026 782nd Yewzir 🇧🇪 583 130 373ms 2 Oct 2025 783rd Jonatan6 🇩🇰 582 111 2ms 27 Apr 2024 783rd dokutan 582 111 2ms 30 Mar 2025 785th MeWhenI 🇻🇦 580 132 3ms 1 Dec 2023 786th coreynash 578 100 12ms 14 Jul 2024 787th Jonatan6 🇩🇰 577 148 61ms 27 Apr 2024 788th dokutan 574 84 657ms 9 Apr 2024 789th snoozingnewt 🇨🇦 574 141 469ms 15 Oct 2025 790th bac0id 572 98 11ms 10 Jan 2025 790th Troon 572 98 11ms 18 Feb 2025 792nd c0d3-4-F00d 🇩🇪 572 113 2ms 4 Dec 2023 792nd bac0id 572 113 2ms 10 Jan 2025 794th snoozingnewt 🇨🇦 572 115 2ms 15 Oct 2025 795th steffan-polygolf 570 131 4ms 29 Feb 2024 796th ethanlally 570 133 458ms 14 Nov 2025 796th snoozingnewt 🇨🇦 570 133 497ms 5 Dec 2025 798th rboath 569 108 94ms 17 Dec 2024 799th brimstonetrader 569 128 130ms 23 Feb 2024 800th snoozingnewt 🇨🇦 569 150 436ms 15 Oct 2025 First Prev 721–800 of 1,535 Next Last