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 Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz 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 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 Apéry’s Constant Binary Lambda Calculus Calendar Connect Four Continued Fractions 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 Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial All Languages ><> 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 ALGOL 68 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Bytes Chars Scoring Bytes Chars Language All ><> 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 ALGOL 68 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight 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 Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz 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 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 Apéry’s Constant Binary Lambda Calculus Calendar Connect Four Continued Fractions 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 Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Bytes Time Submitted 1st Lydxn 🇨🇦 1,000 57 38ms 27 Feb 2022 2nd JayXon 🇺🇸 983 58 32ms 28 Dec 2024 3rd canissimia 🇦🇶 934 61 58ms 18 Jul 2022 4th primo-ppcg 🇹🇭 919 62 34ms 11 Jan 2022 4th Steffan153 🇫🇮 919 62 43ms 28 Jun 2024 4th Natanaelel 🇸🇪 919 62 34ms 18 May 2025 4th xsot 🇸🇬 919 62 36ms 6 Jul 2025 4th sean-niemann 🇺🇸 919 62 34ms 3 Aug 2025 4th pardouin 🇫🇷 919 62 41ms 2 Sep 2025 10th ovs-code 🇩🇪 905 63 33ms 9 May 2023 10th nwellnhof 🇩🇪 905 63 37ms 18 Jul 2023 12th sisyphus-ppcg 🇦🇺 891 64 34ms 11 Jan 2022 12th GrayJoKing 🇦🇺 891 64 42ms 10 Feb 2022 14th MeWhenI 🇻🇦 877 65 37ms 7 Dec 2023 15th error256 864 66 36ms 8 May 2025 16th janlelis 851 67 38ms 11 Jan 2022 16th stefangimmillaro 851 67 33ms 26 Dec 2024 18th akshatj27 🇦🇶 838 68 38ms 10 Jan 2022 18th SirBogman 🇺🇸 838 68 35ms 19 May 2022 18th Shanethegamer 🇺🇸 838 68 33ms 27 May 2022 18th Haksell 🇦🇶 838 68 38ms 23 Feb 2023 18th anter69 🇭🇺 838 68 38ms 20 Nov 2023 23rd 4hg 🇺🇸 826 69 37ms 30 Nov 2022 23rd Andriamanitra 🇫🇮 826 69 46ms 17 Apr 2023 25th DialFrost 🇸🇬 803 71 35ms 26 Dec 2024 26th tatzyr 🇯🇵 792 72 32ms 28 Dec 2024 27th lacrosse 781 73 32ms 4 days ago 28th Waffle3z 770 74 48ms 12 Jan 2022 28th olleicua 🇺🇸 770 74 36ms 16 Feb 2024 28th emgordon154 770 74 54ms 25 Jun 2024 31st jared-hughes 760 75 38ms 9 Sep 2022 32nd jstanley0 740 77 34ms 5 Feb 2022 32nd olivermrose 🇺🇸 740 77 35ms 5 Dec 2022 34th aaronze 🇦🇺 713 80 48ms 21 Sep 2023 35th galloj 🇨🇿 687 83 37ms 9 Sep 2022 36th HumanoidCPU 620 92 36ms 2 Mar 2025 37th KatieLG 🇬🇧 613 93 37ms 9 Jun 2024 38th adoxography 588 97 38ms 20 Jan 2022 38th alexjurkiewicz 🇦🇺 588 97 37ms 7 Jul 2022 40th LostSyntax21 🇬🇧 576 99 44ms 9 Sep 2024 41st madex 🇩🇪 467 122 34ms 16 Jun 2024 42nd mosegontar 410 139 33ms 6 Jul 2022 43rd Ralac07 🇦🇺 375 152 36ms 21 Jun 2024 44th KatieLG-Transpiler 🇬🇧 288 198 35ms 3 Jul 2022 1–44 of 44
