ISBN in Ruby 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 Gray Code Decoder Gray Code Encoder 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 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 Gray Code Decoder Gray Code Encoder 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 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 1st Lydxn 🇨🇦 1,000 57 40ms 27 Feb 2022 2nd JayXon 🇺🇸 983 58 36ms 28 Dec 2024 3rd canissimia 🇦🇶 934 61 39ms 18 Jul 2022 3rd Steffan153 🇫🇮 934 61 36ms 9 Mar 2026 5th primo-ppcg 🇹🇭 919 62 37ms 11 Jan 2022 5th Natanaelel 🇸🇪 919 62 37ms 18 May 2025 5th xsot 🇸🇬 919 62 38ms 6 Jul 2025 5th sean-niemann 🇺🇸 919 62 37ms 3 Aug 2025 5th pardouin 🇫🇷 919 62 36ms 2 Sep 2025 10th ovs-code 🇩🇪 905 63 40ms 9 May 2023 10th nwellnhof 🇩🇪 905 63 36ms 18 Jul 2023 12th sisyphus-ppcg 🇦🇺 891 64 39ms 11 Jan 2022 12th GrayJoKing 🇦🇺 891 64 38ms 10 Feb 2022 14th MeWhenI 🇻🇦 877 65 35ms 7 Dec 2023 15th error256 864 66 37ms 8 May 2025 16th janlelis 851 67 36ms 11 Jan 2022 16th stefangimmillaro 851 67 40ms 26 Dec 2024 18th akshatj27 🇦🇶 838 68 35ms 10 Jan 2022 18th SirBogman 🇺🇸 838 68 38ms 19 May 2022 18th Shanethegamer 🇺🇸 838 68 35ms 27 May 2022 18th Haksell 🇦🇶 838 68 37ms 23 Feb 2023 18th anter69 🇭🇺 838 68 38ms 20 Nov 2023 23rd 4hg 🇺🇸 826 69 35ms 30 Nov 2022 23rd Andriamanitra 🇫🇮 826 69 39ms 17 Apr 2023 25th denkyuu1 814 70 36ms 18 Feb 2026 26th DialFrost 🇸🇬 803 71 36ms 26 Dec 2024 26th blaztoma 🇱🇹 803 71 37ms 3 hours ago 28th tatzyr 🇯🇵 792 72 36ms 28 Dec 2024 29th lacrosse 781 73 35ms 28 Nov 2025 30th Waffle3z 770 74 36ms 12 Jan 2022 30th olleicua 🇺🇸 770 74 37ms 16 Feb 2024 30th emgordon154 770 74 36ms 25 Jun 2024 33rd jared-hughes 760 75 38ms 9 Sep 2022 34th jstanley0 740 77 35ms 5 Feb 2022 34th olivermrose 🇺🇸 740 77 39ms 5 Dec 2022 36th aaronze 🇦🇺 713 80 37ms 21 Sep 2023 37th TheZwierzLF 🇵🇱 695 82 36ms 21 Dec 2025 38th galloj 🇨🇿 687 83 36ms 9 Sep 2022 39th HumanoidCPU 620 92 37ms 2 Mar 2025 40th KatieLG 🇬🇧 613 93 36ms 9 Jun 2024 41st adoxography 588 97 35ms 20 Jan 2022 41st alexjurkiewicz 🇦🇺 588 97 37ms 7 Jul 2022 43rd LostSyntax21 🇬🇧 576 99 37ms 9 Sep 2024 43rd flekAI 576 99 38ms 6 days ago 45th madex 🇩🇪 467 122 37ms 16 Jun 2024 46th mosegontar 410 139 38ms 6 Jul 2022 47th Ralac07 🇦🇺 375 152 36ms 21 Jun 2024 48th KatieLG-Transpiler 🇬🇧 288 198 37ms 3 Jul 2022 49th jusaka 282 202 35ms 3 days ago 1–49 of 49
