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 801st msbranicky 568 128 2,496ms 9 Jan 2025 802nd dokutan 568 129 438ms 26 Oct 2024 802nd snoozingnewt 🇨🇦 568 129 381ms 15 Oct 2025 804th Ripick 566 99 12ms 1 Dec 2023 804th hellwue 566 99 11ms 22 Feb 2024 806th madeforlosers 563 112 41ms 8 Dec 2023 807th Natanaelel 🇸🇪 562 133 19ms 29 Dec 2023 808th AstroOrbis 561 100 11ms 22 Feb 2026 809th snoozingnewt 🇨🇦 560 130 119ms 15 Oct 2025 810th snoozingnewt 🇨🇦 560 170 25ms 15 Oct 2025 811th Chinay-Domitrix 🇺🇸 559 130 2,621ms 4 Nov 2025 811th dokutan 559 130 8ms 25 Feb 2026 813th jerrandolph 558 173 286ms 22 Dec 2023 814th 051 🇸🇬 555 101 11ms 24 Dec 2023 815th Protothor 555 104 11ms 27 days ago 816th mrmena 🇦🇺 553 114 43ms 11 May 2024 817th kkoenig 552 117 2ms 22 Dec 2023 817th tsschepens 552 117 2ms 26 Feb 2026 819th JRaspass 🇬🇧 551 73 128ms 4 Jan 2024 820th dokutan 551 132 2,677ms 26 Oct 2024 821st msbranicky 551 155 1,449ms 2 Jan 2024 822nd WillConker 550 102 28ms 10 Mar 2024 823rd msbranicky 549 112 86ms 8 Jan 2024 824th MeWhenI 🇻🇦 548 115 68ms 1 Dec 2023 825th Yewzir 🇧🇪 547 139 124ms 5 Feb 2024 826th snoozingnewt 🇨🇦 546 156 3ms 15 Oct 2025 827th MWI-polygolf 545 137 4ms 7 Dec 2023 828th Apataras 545 139 424ms 3 Jul 2025 829th markusgraube 544 103 11ms 22 Jun 2024 830th HumanoidCPU 543 119 2ms 5 Mar 2024 831st dokutan 542 77 41ms 29 Oct 2024 832nd KadinSchultz 539 104 10ms 4 Dec 2023 832nd cros107 🇦🇺 539 104 11ms 26 Dec 2023 832nd JunkIce 539 104 12ms 24 Nov 2024 835th janbehrens 🇩🇪 538 120 2ms 22 Dec 2023 836th CatsAreFluffy 537 159 73ms 31 Jan 2024 837th msbranicky 536 117 124ms 2 Jan 2024 838th msbranicky 536 151 148ms 2 Jan 2024 839th blaztoma 🇱🇹 535 78 40ms 4 Nov 2025 840th tomh1012 535 108 11ms 3 hours ago 841st madex 🇩🇪 534 105 12ms 21 May 2024 842nd MeWhenI 🇻🇦 532 84 3ms 1 Dec 2023 843rd janbehrens 🇩🇪 531 138 414ms 17 Apr 2025 844th Yewzir 🇧🇪 529 150 3ms 29 Mar 2024 845th HumanoidCPU 529 153 104ms 16 Nov 2025 846th YAJUE114514 527 138 146ms 23 Jul 2025 847th anarconic 526 125 2ms 11 Dec 2023 848th Yewzir 🇧🇪 525 117 89ms 5 Feb 2024 849th CarsonChr 🇺🇸 524 145 124ms 24 Dec 2023 850th msbranicky 522 152 3ms 2 Jan 2024 851st snoozingnewt 🇨🇦 521 121 1,347ms 15 Oct 2025 852nd steffan-polygolf 521 133 12ms 29 Feb 2024 853rd neihousaigaai 519 108 11ms 11 Feb 2024 854th dokutan 519 121 120ms 29 Oct 2024 855th JDiLenarda 🇫🇷 517 122 1,277ms 13 Sep 2024 856th snoozingnewt 🇨🇦 517 125 2ms 15 Oct 2025 857th weliveinhell 🇭🇹 517 147 131ms 2 Dec 2023 858th Bodo171 514 109 11ms 1 Jul 2024 858th trist224 🇫🇷 514 109 11ms 3 Aug 2025 860th janAkali 🇷🇺 514 122 1,898ms 8 days ago 861st JunkIce 513 104 373ms 3 Dec 2024 862nd Kokusui 🇯🇵 513 108 5ms 26 Jul 2024 863rd rollershutter 510 110 13ms 20 Dec 2023 863rd fourth-bit 510 110 23ms 1 Jul 2024 863rd jipsong 🇩🇪 510 110 21ms 5 Jul 2025 866th msbranicky 510 149 115ms 1 Jan 2024 867th snoozingnewt 🇨🇦 509 136 9ms 15 Oct 2025 868th dokutan 509 156 3ms 26 Oct 2024 869th snoozingnewt 🇨🇦 508 143 2,552ms 15 Oct 2025 870th msbranicky 507 116 163ms 1 Jan 2024 871st typeswitch-dev 🇵🇹 507 151 5ms 25 Jun 2024 872nd alphafalfa 506 107 2ms 26 Aug 2024 873rd dokutan 505 100 7ms 28 Oct 2024 874th minhtrancccp 505 111 11ms 1 Dec 2023 874th croc54 505 111 21ms 30 Dec 2024 874th Mikey-Beep 🇬🇧 505 111 21ms 24 Jul 2025 874th CommandLeo 🇮🇹 505 111 21ms 1 Nov 2025 878th MeWhenI 🇻🇦 505 132 95ms 1 Dec 2023 879th snoozingnewt 🇨🇦 502 133 91ms 15 Oct 2025 880th knutae 🇳🇴 500 112 23ms 16 Dec 2023 First Prev 801–880 of 1,534 Next Last