The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 27 hours. 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 798th CommandLeo 🇮🇹 573 111 21ms 1 Nov 2025 802nd c0d3-4-F00d 🇩🇪 572 113 2ms 4 Dec 2023 802nd bac0id 572 113 2ms 10 Jan 2025 804th snoozingnewt 🇨🇦 572 115 2ms 15 Oct 2025 805th steffan-polygolf 570 131 4ms 29 Feb 2024 806th ethanlally 570 133 458ms 14 Nov 2025 806th snoozingnewt 🇨🇦 570 133 497ms 5 Dec 2025 808th rboath 569 108 94ms 17 Dec 2024 809th brimstonetrader 569 128 130ms 23 Feb 2024 810th snoozingnewt 🇨🇦 569 150 436ms 15 Oct 2025 811th knutae 🇳🇴 568 112 23ms 16 Dec 2023 812th msbranicky 568 128 2,496ms 9 Jan 2025 813th dokutan 568 129 438ms 26 Oct 2024 813th snoozingnewt 🇨🇦 568 129 381ms 15 Oct 2025 815th madeforlosers 563 112 41ms 8 Dec 2023 816th mathisfun271 563 113 20ms 23 Dec 2023 816th fkantelberg 563 113 22ms 12 Jul 2025 816th Artemis21 🇬🇧 563 113 12ms 22 Jan 2026 819th Natanaelel 🇸🇪 562 133 19ms 29 Dec 2023 820th snoozingnewt 🇨🇦 561 170 25ms 15 Oct 2025 821st snoozingnewt 🇨🇦 560 130 119ms 15 Oct 2025 822nd dokutan 559 102 1,076ms 22 Sep 2025 823rd Chinay-Domitrix 🇺🇸 559 130 2,621ms 4 Nov 2025 823rd dokutan 559 130 8ms 25 Feb 2026 825th jerrandolph 558 173 286ms 22 Dec 2023 826th Protothor 555 104 11ms 27 Feb 2026 827th dokutan 554 111 88ms 31 Mar 2025 828th mrmena 🇦🇺 553 114 43ms 11 May 2024 829th anarconic 553 115 12ms 11 Dec 2023 829th moustave 553 115 22ms 19 Nov 2024 829th damoose717 553 115 21ms 23 May 2025 832nd kkoenig 552 117 2ms 22 Dec 2023 832nd tsschepens 552 117 2ms 26 Feb 2026 834th dokutan 551 132 2,677ms 26 Oct 2024 835th msbranicky 551 155 1,449ms 2 Jan 2024 836th dokutan 550 105 10ms 5 Jun 2025 837th msbranicky 549 112 86ms 8 Jan 2024 838th MeWhenI 🇻🇦 548 115 68ms 1 Dec 2023 839th NanduBC 548 116 12ms 6 Sep 2024 840th Yewzir 🇧🇪 547 139 124ms 5 Feb 2024 841st snoozingnewt 🇨🇦 546 156 3ms 15 Oct 2025 842nd MWI-polygolf 545 137 4ms 7 Dec 2023 843rd Apataras 545 139 424ms 3 Jul 2025 844th KatieLG 🇬🇧 544 113 462ms 19 Apr 2025 845th HumanoidCPU 543 119 2ms 5 Mar 2024 846th janbehrens 🇩🇪 538 120 2ms 22 Dec 2023 847th CatsAreFluffy 537 159 73ms 31 Jan 2024 848th msbranicky 536 117 124ms 2 Jan 2024 849th msbranicky 536 151 148ms 2 Jan 2024 850th blaztoma 🇱🇹 535 78 40ms 4 Nov 2025 851st emgordon154 535 103 52ms 19 Feb 2026 852nd tomh1012 535 108 11ms 3 days ago 853rd jeff-at-tamer-dot-codes 🇺🇸 535 119 21ms 19 Dec 2023 854th MeWhenI 🇻🇦 532 84 2ms 1 Dec 2023 855th janbehrens 🇩🇪 531 138 414ms 17 Apr 2025 856th Yewzir 🇧🇪 529 150 3ms 29 Mar 2024 857th HumanoidCPU 529 153 104ms 16 Nov 2025 858th dcgjb 527 80 1,115ms 25 Mar 2024 859th YAJUE114514 527 138 146ms 23 Jul 2025 860th TinyTheBrontosaurus 526 121 20ms 3 Dec 2023 860th RobertHoeh 526 121 12ms 9 Dec 2023 860th klixel 🇨🇦 526 121 12ms 21 Jun 2025 863rd anarconic 526 125 2ms 11 Dec 2023 864th Yewzir 🇧🇪 525 117 89ms 5 Feb 2024 865th MeWhenI 🇻🇦 525 132 11ms 12 Dec 2023 866th CarsonChr 🇺🇸 524 145 124ms 24 Dec 2023 867th HumanoidCPU 522 80 36ms 5 Jun 2024 868th msbranicky 522 152 3ms 2 Jan 2024 869th snoozingnewt 🇨🇦 521 121 1,347ms 15 Oct 2025 870th Just4FunCoder 521 122 23ms 26 Feb 2024 870th SB-945 521 122 24ms 7 Apr 2024 870th lelbal 521 122 11ms 27 days ago 873rd steffan-polygolf 521 133 12ms 29 Feb 2024 874th dokutan 519 121 120ms 29 Oct 2024 875th JDiLenarda 🇫🇷 517 122 1,277ms 13 Sep 2024 876th Stockoh 🇫🇷 517 123 12ms 23 Apr 2024 876th jatloe 517 123 24ms 24 Aug 2024 878th snoozingnewt 🇨🇦 517 125 2ms 15 Oct 2025 879th weliveinhell 🇭🇹 517 147 131ms 2 Dec 2023 880th janbehrens 🇩🇪 515 97 657ms 9 Jan 2024 First Prev 801–880 of 1,548 Next Last