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?
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 721st Yewzir 🇧🇪 633 111 83ms 5 Feb 2024 721st HumanoidCPU 633 111 85ms 5 Jun 2024 723rd luuumine 🇫🇷 633 120 127ms 19 Nov 2025 724th denkyuu1 632 79 725ms 39 hours ago 725th 051 🇸🇬 630 101 11ms 24 Dec 2023 726th lifthrasiir 🇰🇷 629 46 2ms 5 Dec 2024 727th IISResetMe 629 67 883ms 4 Dec 2023 728th Creative0708 🇨🇦 628 121 117ms 16 Dec 2023 728th mousetail 🇳🇱 628 121 120ms 24 Mar 2024 730th WillConker 624 102 28ms 10 Mar 2024 730th FlorianCassayre 🇫🇷 624 102 11ms 18 May 2024 732nd snoozingnewt 🇨🇦 624 109 103ms 29 Nov 2025 733rd two-bad 🇬🇧 621 93 13ms 5 Feb 2024 733rd helbling 🇨🇭 621 93 14ms 16 Jun 2024 733rd thisishowmymindworks 🇳🇴 621 93 14ms 28 Jun 2024 736th iczelia 🇩🇪 621 104 2ms 10 Oct 2025 737th markusgraube 618 103 11ms 22 Jun 2024 738th MeWhenI 🇻🇦 618 105 17ms 1 Dec 2023 739th msbranicky 618 154 25ms 3 Jan 2024 740th Lydxn 🇨🇦 616 123 414ms 16 Dec 2023 741st Shanethegamer 🇺🇸 614 68 39ms 1 Dec 2023 742nd Andrey-Plotnikov 614 94 11ms 13 Jan 2025 743rd bac0id 614 139 446ms 10 Jan 2025 744th dokutan 614 155 25ms 20 Apr 2025 745th FortuiteMan 🇫🇷 613 98 13ms 18 Dec 2025 746th Maximizer02 613 113 12ms 7 Nov 2024 747th KadinSchultz 612 104 10ms 4 Dec 2023 747th cros107 🇦🇺 612 104 11ms 26 Dec 2023 749th HumanoidCPU 608 95 10ms 16 Nov 2025 750th uttumuttu 🇫🇮 608 101 91ms 21 Dec 2023 751st madex 🇩🇪 606 105 12ms 21 May 2024 752nd msbranicky 606 116 78ms 2 Jan 2024 753rd h3ra993huskp 🇯🇵 606 125 466ms 30 Nov 2025 754th annaproxy 604 107 2ms 20 Dec 2023 755th dokutan 604 134 452ms 27 Sep 2025 756th emgordon154 603 48 3ms 8 days ago 757th MeWhenI 🇻🇦 603 132 95ms 1 Dec 2023 758th msbranicky 603 235 1,619ms 16 Sep 2025 759th SirBogman 🇺🇸 602 70 294ms 28 Feb 2024 760th dokutan 602 113 118ms 31 Oct 2024 761st Yewzir 🇧🇪 601 96 12ms 5 Feb 2024 762nd Yewzir 🇧🇪 599 135 479ms 5 Feb 2024 763rd JRaspass 🇬🇧 598 73 128ms 4 Jan 2024 764th snoozingnewt 🇨🇦 598 133 91ms 15 Oct 2025 765th dokutan 598 237 1,728ms 19 Oct 2025 766th Natanaelel 🇸🇪 597 122 137ms 22 Mar 2024 767th MeWhenI 🇻🇦 594 71 265ms 1 Dec 2023 768th CatsAreFluffy 593 93 53ms 14 Mar 2024 769th emgordon154 593 126 12ms 2 Jan 2025 770th dokutan 593 144 61ms 30 Mar 2025 771st dokutan 592 106 2ms 12 Nov 2025 772nd Yewzir 🇧🇪 592 115 110ms 5 Feb 2024 773rd dokutan 592 128 387ms 21 Feb 2026 774th dokutan 591 119 81ms 31 Mar 2025 775th JOrE20 591 161 27ms 14 Feb 2026 776th janbehrens 🇩🇪 590 137 430ms 22 Dec 2023 777th neihousaigaai 589 108 11ms 11 Feb 2024 778th janbehrens 🇩🇪 589 145 65ms 22 Dec 2023 779th HumanoidCPU 588 164 274ms 26 Aug 2024 780th dokutan 587 85 666ms 9 Apr 2024 781st msbranicky 587 112 2ms 2 Jan 2024 782nd arctouch-cristiannevianna 586 125 393ms 19 Feb 2024 783rd Bodo171 584 109 11ms 1 Jul 2024 783rd trist224 🇫🇷 584 109 11ms 3 Aug 2025 785th Yewzir 🇧🇪 583 130 373ms 2 Oct 2025 786th Jonatan6 🇩🇰 582 111 2ms 27 Apr 2024 786th dokutan 582 111 2ms 30 Mar 2025 788th MeWhenI 🇻🇦 580 132 3ms 1 Dec 2023 789th rollershutter 578 110 13ms 20 Dec 2023 789th fourth-bit 578 110 23ms 1 Jul 2024 789th jipsong 🇩🇪 578 110 21ms 5 Jul 2025 792nd coreynash 577 100 12ms 14 Jul 2024 792nd snoozingnewt 🇨🇦 577 100 11ms 15 Oct 2025 794th Jonatan6 🇩🇰 577 148 61ms 27 Apr 2024 795th snoozingnewt 🇨🇦 574 141 469ms 15 Oct 2025 796th minhtrancccp 573 111 11ms 1 Dec 2023 796th croc54 573 111 21ms 30 Dec 2024 796th Mikey-Beep 🇬🇧 573 111 21ms 24 Jul 2025 796th CommandLeo 🇮🇹 573 111 21ms 1 Nov 2025 800th c0d3-4-F00d 🇩🇪 572 113 2ms 4 Dec 2023 First Prev 721–800 of 1,545 Next Last