The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 32 hours. 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 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 64th anter69 🇭🇺 893 28 36ms 9 Feb 2023 64th Andriamanitra 🇫🇮 893 28 39ms 17 Jul 2023 64th Yewzir 🇧🇪 893 28 38ms 7 Nov 2023 64th Betuaredead 893 28 37ms 13 Nov 2023 64th BREMAUCY 🇫🇷 893 28 34ms 17 Mar 2024 64th voytxt 🇨🇿 893 28 34ms 7 Apr 2024 64th jipsong 🇩🇪 893 28 33ms 13 Jun 2024 64th CaedenHarper 🇨🇦 893 28 36ms 28 Aug 2025 64th jacekwladzinski 893 28 38ms 9 Oct 2025 64th blaztoma 🇱🇹 893 28 34ms 11 Oct 2025 64th solisolu 893 28 33ms 18 Nov 2025 64th Matter1024 🇮🇳 893 28 35ms 4 hours ago 93rd graft 862 29 35ms 11 Mar 2018 93rd ryanmt 862 29 35ms 27 Jun 2019 93rd reireias 862 29 37ms 29 Jul 2019 93rd akira-aizawa 🇯🇵 862 29 35ms 3 Nov 2020 93rd liemvo 🇻🇳 862 29 35ms 11 May 2021 93rd DaCuteRaccoon 862 29 35ms 30 Nov 2022 93rd badboj40 862 29 36ms 13 Feb 2023 93rd TFeld00 🇩🇰 862 29 35ms 14 Feb 2023 93rd dokutan 862 29 38ms 5 Jul 2024 93rd HumanoidCPU 862 29 33ms 8 Aug 2024 93rd LostSyntax21 🇬🇧 862 29 34ms 3 Dec 2024 93rd csharpython 862 29 36ms 22 Jul 2025 93rd Babafaba 862 29 35ms 21 Nov 2025 93rd D-MOVE 🇵🇭 862 29 32ms 15 Dec 2025 93rd matricronia 862 29 36ms 31 Jan 2026 108th vonagam 833 30 41ms 8 Nov 2017 108th ConorOBrien-Foxx 833 30 36ms 10 Apr 2018 108th jaredcrystal 🇺🇸 833 30 34ms 22 Sep 2018 108th hugolgst 833 30 35ms 15 May 2019 108th sapphyrus 833 30 34ms 2 Aug 2019 108th sk- 833 30 34ms 12 Sep 2019 108th taw 833 30 34ms 22 Jun 2020 108th jngbsn 833 30 34ms 30 Jun 2020 108th marcin7Cd 833 30 34ms 8 Oct 2020 108th Marin-Kitagawa 833 30 35ms 18 Jul 2021 108th olivermrose 🇺🇸 833 30 34ms 27 Aug 2021 108th CedricGebistorf 833 30 38ms 4 Mar 2022 108th nyoshe 833 30 32ms 10 Oct 2023 108th wowu 833 30 35ms 19 Sep 2024 108th FortuiteMan 🇫🇷 833 30 33ms 28 Nov 2025 123rd VladYermakov 806 31 37ms 27 Oct 2017 123rd j55d 806 31 34ms 5 Dec 2017 123rd biinari 806 31 34ms 18 Mar 2018 123rd philipper905 806 31 35ms 11 Apr 2018 123rd segiddins 806 31 36ms 24 Aug 2018 123rd mgergi 806 31 35ms 10 Oct 2018 123rd acornellier 806 31 35ms 7 Dec 2018 123rd fynnkroeger 806 31 34ms 10 Jan 2021 123rd kirbyyourmom 🇬🇧 806 31 36ms 25 Feb 2021 123rd souta-1326 806 31 34ms 20 Apr 2021 123rd aaronze 🇦🇺 806 31 34ms 30 Apr 2021 123rd XorZy 806 31 35ms 29 May 2021 123rd kinoute 🇫🇷 806 31 35ms 10 Sep 2021 123rd BrenSchaap 806 31 35ms 18 Nov 2021 123rd shibacho 🇯🇵 806 31 36ms 18 Mar 2022 123rd bryanmytko 806 31 36ms 2 Jul 2022 123rd Alex-x90 🇺🇸 806 31 35ms 3 Feb 2023 123rd Haksell 🇦🇶 806 31 34ms 22 Feb 2023 123rd ejini6969 806 31 37ms 22 Mar 2023 123rd mikiymk 806 31 35ms 21 Sep 2023 123rd mathisfun271 806 31 34ms 21 Feb 2024 123rd qytiz 806 31 33ms 15 Apr 2024 123rd kaizer1308 806 31 36ms 11 Mar 2025 123rd AetherQuantity 806 31 34ms 21 Oct 2025 123rd Thinkr1 806 31 33ms 19 Nov 2025 123rd JOrE20 806 31 37ms 30 Dec 2025 123rd bitsandbeyond 🇳🇱 806 31 33ms 11 Jan 2026 123rd FranklinJiaChen 806 31 35ms 15 Feb 2026 151st kieraneglin 781 32 36ms 8 Nov 2017 151st handisb 781 32 37ms 14 Sep 2019 151st Anonymousellama21 781 32 38ms 18 Feb 2022 151st raphaelimahorn 781 32 35ms 18 days ago 155th venus-as-a-boy 758 33 34ms 22 Oct 2018 155th KrausRaus 🇺🇸 758 33 34ms 23 Mar 2020 155th doberan 758 33 34ms 2 Nov 2020 155th Secozzi 758 33 38ms 3 Nov 2020 155th ls-samer-abuthaher 758 33 35ms 7 Oct 2022 155th desecaw13 758 33 37ms 25 Jan 2025 First Prev 81–160 of 281 Next Last
