The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 days. Why not try and solve them ahead of time?
Fibonacci in Ruby 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 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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 1st Lydxn 🇨🇦 1,000 25 65ms 4 Jun 2021 1st primo-ppcg 🇹🇭 1,000 25 37ms 4 Jun 2021 1st radarek 🇵🇱 1,000 25 36ms 2 Feb 2022 1st sisyphus-ppcg 🇦🇺 1,000 25 62ms 2 Feb 2022 1st GrayJoKing 🇦🇺 1,000 25 34ms 24 Aug 2023 1st error256 1,000 25 36ms 10 May 2024 1st Steffan153 🇫🇮 1,000 25 68ms 11 Feb 2026 8th xsot 🇸🇬 962 26 33ms 22 Apr 2018 8th UladzimirSukharukau 962 26 33ms 9 May 2018 8th hrrs01 962 26 34ms 31 Jan 2019 8th janlelis 962 26 35ms 12 Apr 2019 8th prplz 🇦🇺 962 26 35ms 21 Dec 2019 8th dbdr 962 26 34ms 5 Jan 2020 8th nwellnhof 🇩🇪 962 26 32ms 15 Feb 2020 8th antimon2 🇯🇵 962 26 38ms 27 Jun 2020 8th KatieLG 🇬🇧 962 26 34ms 22 Sep 2020 8th hiddicop 🇸🇪 962 26 36ms 26 Jan 2021 8th NewDefectus 🇮🇱 962 26 38ms 6 Feb 2021 8th JayXon 🇺🇸 962 26 32ms 19 Feb 2021 8th MatheusAvellar 🇧🇷 962 26 36ms 6 May 2021 8th Shanethegamer 🇺🇸 962 26 34ms 21 May 2021 8th gilufin 962 26 35ms 30 May 2021 8th Irratix 🇳🇱 962 26 36ms 4 Jun 2021 8th stefangimmillaro 962 26 35ms 16 Jun 2021 8th mrondon8 962 26 37ms 5 Sep 2021 8th ovs-code 🇩🇪 962 26 34ms 18 Nov 2021 8th SirBogman 🇺🇸 962 26 34ms 20 Nov 2021 8th Natanaelel 🇸🇪 962 26 34ms 12 Dec 2021 8th MeWhenI 🇻🇦 962 26 35ms 6 Jan 2022 8th akshatj27 🇦🇶 962 26 36ms 11 Jan 2022 8th btnlq 962 26 36ms 1 Feb 2022 8th lynn 962 26 38ms 25 May 2022 8th Mortis66666 962 26 36ms 12 Jul 2022 8th 4hg 🇺🇸 962 26 36ms 14 Jul 2022 8th tkr-sh 🇰🇵 962 26 34ms 14 Jul 2022 8th OhmNomNom 962 26 33ms 14 Oct 2022 8th DialFrost 🇸🇬 962 26 34ms 2 Dec 2022 8th aksyristos 962 26 34ms 26 Jan 2023 8th m-tkach 🇺🇦 962 26 33ms 9 Feb 2023 8th AlephSquirrel 962 26 34ms 14 Apr 2023 8th snoozingnewt 🇨🇦 962 26 35ms 23 Sep 2023 8th FlyingPenguin223 962 26 39ms 16 Oct 2023 8th rniii 962 26 34ms 19 Oct 2023 8th sean-niemann 🇺🇸 962 26 39ms 3 Jan 2024 8th wlaud9 962 26 34ms 5 Feb 2024 8th olleicua 🇺🇸 962 26 35ms 15 Feb 2024 8th ngthanhtrung23 962 26 37ms 10 Mar 2024 8th neel11235813 962 26 35ms 26 Mar 2024 8th duckyluuk 🇳🇱 962 26 35ms 9 Apr 2024 8th pardouin 🇫🇷 962 26 34ms 4 Sep 2024 8th tatzyr 🇯🇵 962 26 34ms 3 Dec 2024 8th ndren 962 26 35ms 17 Dec 2024 8th plcc0 962 26 37ms 27 Mar 2025 8th AbrahamJLR 🇻🇪 962 26 34ms 14 Jun 2025 8th vishal-mohanty 962 26 36ms 24 Aug 2025 8th fuzzylojik-golf 🇺🇸 962 26 35ms 29 Aug 2025 8th beirigo 🇧🇷 962 26 37ms 23 Oct 2025 8th CornerMercury 🇬🇧 962 26 33ms 4 Dec 2025 8th darrenks 🇺🇸 962 26 36ms 19 mins ago 60th mirroredcat 926 27 40ms 1 Jun 2021 60th emgordon154 926 27 37ms 12 Dec 2021 60th jared-hughes 926 27 31ms 20 Sep 2022 60th aydamak 926 27 36ms 7 May 2024 64th n1LS 893 28 36ms 26 Sep 2019 64th osinsky 893 28 33ms 6 Nov 2019 64th yzhs 🇩🇪 893 28 33ms 2 Feb 2020 64th proton 🇩🇪 893 28 38ms 20 Jun 2020 64th OddballGreg 893 28 33ms 26 Sep 2020 64th Waffle3z 893 28 36ms 8 Oct 2020 64th BBoehm 🇩🇪 893 28 36ms 26 Dec 2020 64th SnowballSH 893 28 34ms 27 Jan 2021 64th rak1507 🇬🇧 893 28 34ms 6 Feb 2021 64th roor0 893 28 36ms 18 Mar 2021 64th janbehrens 🇩🇪 893 28 35ms 24 Mar 2021 64th davishyer 893 28 37ms 12 Apr 2021 64th razetime 893 28 34ms 29 Apr 2021 64th ytaki0801 🇯🇵 893 28 33ms 19 Jun 2021 64th schachmattmatt 893 28 34ms 3 Oct 2021 64th orthoplex 🇨🇽 893 28 35ms 29 Mar 2022 64th scpchicken 🇵🇼 893 28 36ms 10 Jan 2023 1–80 of 280 Next Last
