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 801st msbranicky 568 94 436ms 17 Jan 2024 802nd msbranicky 568 128 2,496ms 9 Jan 2025 803rd dokutan 568 129 438ms 26 Oct 2024 803rd snoozingnewt 🇨🇦 568 129 381ms 15 Oct 2025 805th Ripick 566 99 12ms 1 Dec 2023 805th hellwue 566 99 11ms 22 Feb 2024 807th madeforlosers 563 112 41ms 8 Dec 2023 808th Natanaelel 🇸🇪 562 133 19ms 29 Dec 2023 809th AstroOrbis 561 100 11ms 22 Feb 2026 810th snoozingnewt 🇨🇦 561 170 25ms 15 Oct 2025 811th snoozingnewt 🇨🇦 560 130 119ms 15 Oct 2025 812th Chinay-Domitrix 🇺🇸 559 130 2,621ms 4 Nov 2025 812th dokutan 559 130 8ms 25 Feb 2026 814th jerrandolph 558 173 286ms 22 Dec 2023 815th 051 🇸🇬 555 101 11ms 24 Dec 2023 816th Protothor 555 104 11ms 27 Feb 2026 817th mrmena 🇦🇺 553 114 43ms 11 May 2024 818th kkoenig 552 117 2ms 22 Dec 2023 818th tsschepens 552 117 2ms 26 Feb 2026 820th JRaspass 🇬🇧 551 73 128ms 4 Jan 2024 821st dokutan 551 132 2,677ms 26 Oct 2024 822nd msbranicky 551 155 1,449ms 2 Jan 2024 823rd WillConker 550 102 28ms 10 Mar 2024 824th msbranicky 549 112 86ms 8 Jan 2024 825th MeWhenI 🇻🇦 548 115 68ms 1 Dec 2023 826th Yewzir 🇧🇪 547 139 124ms 5 Feb 2024 827th snoozingnewt 🇨🇦 546 156 3ms 15 Oct 2025 828th MWI-polygolf 545 137 4ms 7 Dec 2023 829th Apataras 545 139 424ms 3 Jul 2025 830th markusgraube 544 103 11ms 22 Jun 2024 831st HumanoidCPU 543 119 2ms 5 Mar 2024 832nd dokutan 542 77 41ms 29 Oct 2024 833rd KadinSchultz 539 104 10ms 4 Dec 2023 833rd cros107 🇦🇺 539 104 11ms 26 Dec 2023 833rd JunkIce 539 104 12ms 24 Nov 2024 836th janbehrens 🇩🇪 538 120 2ms 22 Dec 2023 837th CatsAreFluffy 537 159 73ms 31 Jan 2024 838th msbranicky 536 117 124ms 2 Jan 2024 839th msbranicky 536 151 148ms 2 Jan 2024 840th blaztoma 🇱🇹 535 78 40ms 4 Nov 2025 841st tomh1012 535 108 11ms 2 days ago 842nd madex 🇩🇪 534 105 12ms 21 May 2024 843rd MeWhenI 🇻🇦 532 84 3ms 1 Dec 2023 844th janbehrens 🇩🇪 531 138 414ms 17 Apr 2025 845th Yewzir 🇧🇪 529 150 3ms 29 Mar 2024 846th HumanoidCPU 529 153 104ms 16 Nov 2025 847th YAJUE114514 527 138 146ms 23 Jul 2025 848th anarconic 526 125 2ms 11 Dec 2023 849th Yewzir 🇧🇪 525 117 89ms 5 Feb 2024 850th CarsonChr 🇺🇸 524 145 124ms 24 Dec 2023 851st msbranicky 522 152 3ms 2 Jan 2024 852nd snoozingnewt 🇨🇦 521 121 1,347ms 15 Oct 2025 853rd steffan-polygolf 521 133 12ms 29 Feb 2024 854th neihousaigaai 519 108 11ms 11 Feb 2024 855th dokutan 519 121 120ms 29 Oct 2024 856th JDiLenarda 🇫🇷 517 122 1,277ms 13 Sep 2024 857th snoozingnewt 🇨🇦 517 125 2ms 15 Oct 2025 858th weliveinhell 🇭🇹 517 147 131ms 2 Dec 2023 859th Bodo171 514 109 11ms 1 Jul 2024 859th trist224 🇫🇷 514 109 11ms 3 Aug 2025 861st janAkali 🇷🇺 514 122 1,898ms 10 days ago 862nd JunkIce 513 104 373ms 3 Dec 2024 863rd Kokusui 🇯🇵 513 108 5ms 26 Jul 2024 864th rollershutter 510 110 13ms 20 Dec 2023 864th fourth-bit 510 110 23ms 1 Jul 2024 864th jipsong 🇩🇪 510 110 21ms 5 Jul 2025 867th msbranicky 510 149 115ms 1 Jan 2024 868th snoozingnewt 🇨🇦 509 136 9ms 15 Oct 2025 869th dokutan 509 156 3ms 26 Oct 2024 870th snoozingnewt 🇨🇦 508 143 2,552ms 15 Oct 2025 871st msbranicky 507 116 163ms 1 Jan 2024 872nd typeswitch-dev 🇵🇹 507 151 5ms 25 Jun 2024 873rd alphafalfa 506 107 2ms 26 Aug 2024 874th dokutan 505 100 7ms 28 Oct 2024 875th minhtrancccp 505 111 11ms 1 Dec 2023 875th croc54 505 111 21ms 30 Dec 2024 875th Mikey-Beep 🇬🇧 505 111 21ms 24 Jul 2025 875th CommandLeo 🇮🇹 505 111 21ms 1 Nov 2025 879th MeWhenI 🇻🇦 505 132 95ms 1 Dec 2023 880th snoozingnewt 🇨🇦 502 133 91ms 15 Oct 2025 First Prev 801–880 of 1,535 Next Last