The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 28 hours. Why not try and solve them ahead of time?
Fibonacci in C# 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 241st ezrillex 689 74 380ms 21 Nov 2021 241st HassanAliKadhem 🇧🇭 689 74 372ms 16 Jan 2022 241st lalkkot 689 74 373ms 29 Apr 2022 241st phpboyscout 689 74 368ms 27 Apr 2023 241st azure-blondon 689 74 381ms 5 May 2024 246th mort607e 680 75 366ms 21 Nov 2021 246th lesserfish 680 75 375ms 21 Nov 2021 248th mykroft42 671 76 410ms 21 Nov 2021 249th daviddostal 654 78 368ms 21 Nov 2021 249th joll05 🇸🇪 654 78 375ms 21 Nov 2021 249th hacktick 654 78 384ms 22 Mar 2022 249th malworthy 654 78 387ms 13 Oct 2023 249th brimstonetrader 654 78 357ms 5 Jan 2024 254th hklemp 🇩🇪 646 79 391ms 21 Nov 2021 254th MarkStockwellZA 646 79 356ms 4 Jan 2022 254th ElysiaVesper 646 79 370ms 19 Nov 2023 254th JesseNoEyes 🇺🇸 646 79 477ms 25 Sep 2024 254th qrakhen 646 79 375ms 5 Nov 2025 259th brianonymous 630 81 352ms 30 Jul 2022 259th KiwiLT 630 81 378ms 14 Nov 2022 261st lilyyy411 622 82 380ms 21 Nov 2021 262nd ClFeSc 607 84 379ms 3 Aug 2022 263rd Lizard314 600 85 370ms 21 Nov 2021 264th mduckles 593 86 345ms 18 Nov 2022 265th c0d3-4-F00d 🇩🇪 586 87 385ms 21 Nov 2021 265th Rambso 586 87 387ms 28 Mar 2025 267th dillon-duncando 580 88 378ms 21 Dec 2021 268th mihaits 573 89 395ms 21 Nov 2021 268th apocriva 573 89 386ms 24 Nov 2023 270th JacobStanleyJones 567 90 380ms 21 Mar 2022 271st bschorno 560 91 374ms 29 Jul 2022 272nd BradSissons 🇳🇿 554 92 386ms 21 Nov 2021 272nd Xeoneid 554 92 373ms 21 Nov 2021 272nd zaekyo 554 92 384ms 5 Jul 2022 272nd Smetalo 554 92 360ms 24 Aug 2022 276th oschmidh 548 93 388ms 21 Nov 2021 276th sech1p 🇵🇱 548 93 389ms 21 Nov 2021 276th rifatx 548 93 395ms 24 Jul 2024 279th aske0778 543 94 356ms 21 Nov 2021 279th RockOfStone 543 94 359ms 23 Mar 2024 279th BeansMage42 543 94 389ms 29 Dec 2024 282nd ze-h 🇺🇸 531 96 364ms 12 Jan 2022 282nd cingulataluke 531 96 382ms 2 Jun 2024 282nd Emilioso007 531 96 402ms 28 Dec 2025 285th pikti 515 99 407ms 21 Nov 2021 285th artisiole 🇺🇸 515 99 375ms 24 Mar 2024 285th johannes-looney-lizard 515 99 397ms 29 Apr 2025 288th mhayesm 510 100 340ms 21 Nov 2021 288th Robbe7730 510 100 370ms 21 Nov 2021 290th Jennifervl 🇸🇪 505 101 398ms 10 Dec 2021 290th uncertaain 505 101 371ms 28 Dec 2023 292nd tbschff 500 102 346ms 15 Apr 2022 293rd richard-oelze 🇩🇪 490 104 389ms 24 Jan 2021 294th tik25 486 105 360ms 28 Mar 2024 295th wescombs10 481 106 384ms 30 Oct 2022 295th lbussell 481 106 406ms 16 Dec 2022 297th NovemberOrWhatever 477 107 390ms 6 Nov 2022 297th bilal2709 477 107 373ms 13 Aug 2025 297th Melvovin 477 107 394ms 17 Jan 2026 300th Mortistar 472 108 402ms 18 Jul 2023 301st iPablol 468 109 389ms 25 Oct 2023 302nd johnlowerytn 447 114 390ms 30 Dec 2024 303rd sm1lko 440 116 371ms 12 Oct 2022 304th sd-tang 🇦🇺 436 117 375ms 12 Dec 2021 304th gpikmddk 436 117 382ms 17 Oct 2022 306th Noah-Fox 432 118 362ms 1 Jun 2022 307th arctouch-kseniyagaripova 429 119 391ms 9 Nov 2022 308th DaCuteRaccoon 421 121 375ms 28 Apr 2022 309th Anthony-Williams-06 411 124 353ms 30 Nov 2022 309th od86 411 124 373ms 12 Nov 2025 311th abailey2020 🇺🇸 408 125 382ms 21 Nov 2021 312th AwexoTeam 398 128 380ms 17 Jul 2025 313th Endoxos0 381 134 390ms 2 Sep 2022 314th RobertEves92 🇬🇧 372 137 407ms 8 Aug 2023 315th BarisYildiz 367 139 383ms 21 Nov 2021 316th Philipuss1 362 141 384ms 21 Nov 2021 317th arthvr9 359 142 393ms 23 Oct 2024 318th sandbxk 347 147 394ms 24 Aug 2022 319th mwarvik 🇳🇴 336 152 385ms 5 Jan 2026 320th jsermini2 333 153 393ms 21 Nov 2021 First Prev 241–320 of 330 Next Last