Collatz 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 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 Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial All Languages ><> ALGOL 68 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 ArkScript 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 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 ArkScript 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 Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Bytes Time Submitted 1st Lydxn 🇨🇦 1,000 49 36ms 4 May 2022 1st JayXon 🇺🇸 1,000 49 37ms 17 Oct 2022 1st GrayJoKing 🇦🇺 1,000 49 38ms 15 Nov 2022 1st radarek 🇵🇱 1,000 49 188ms 26 Aug 2025 5th canissimia 🇦🇶 980 50 40ms 5 May 2022 5th ovs-code 🇩🇪 980 50 236ms 7 May 2022 5th sisyphus-ppcg 🇦🇺 980 50 42ms 20 Feb 2023 5th Steffan153 🇫🇮 980 50 43ms 20 Jul 2024 5th sean-niemann 🇺🇸 980 50 40ms 9 Jun 2025 5th pardouin 🇫🇷 980 50 40ms 22 Aug 2025 11th nwellnhof 🇩🇪 961 51 35ms 4 May 2022 11th primo-ppcg 🇹🇭 961 51 38ms 6 May 2022 11th janlelis 961 51 36ms 10 May 2022 11th Natanaelel 🇸🇪 961 51 39ms 2 Jun 2022 11th blaztoma 🇱🇹 961 51 40ms 3 hours ago 16th shinh 942 52 37ms 29 Jun 2022 17th MeWhenI 🇻🇦 925 53 40ms 1 Jun 2022 17th stefangimmillaro 925 53 37ms 2 Oct 2022 17th Haksell 🇦🇶 925 53 42ms 22 Feb 2023 20th Andriamanitra 🇫🇮 907 54 41ms 21 Jul 2022 20th jared-hughes 907 54 37ms 12 Sep 2022 20th OhmNomNom 907 54 37ms 7 Oct 2022 20th olleicua 🇺🇸 907 54 41ms 21 Jan 2024 20th LostSyntax21 🇬🇧 907 54 41ms 12 Mar 2025 20th AbrahamJLR 🇻🇪 907 54 40ms 4 Jun 2025 20th vishal-mohanty 907 54 40ms 25 Aug 2025 27th SirBogman 🇺🇸 891 55 38ms 5 May 2022 27th olivermrose 🇺🇸 891 55 42ms 6 May 2022 27th 4hg 🇺🇸 891 55 50ms 24 Aug 2022 27th DialFrost 🇸🇬 891 55 43ms 1 Jan 2023 27th error256 891 55 40ms 4 May 2024 32nd ChiefChippy2 875 56 40ms 4 May 2022 32nd aksyristos 875 56 39ms 29 Jan 2023 32nd 3dm4n 🇫🇮 875 56 36ms 11 Mar 2024 32nd anter69 🇭🇺 875 56 38ms 18 Sep 2024 32nd lgrandco 875 56 40ms 9 Oct 2024 32nd D-MOVE 🇵🇭 875 56 39ms 8 Dec 2025 32nd denkyuu1 875 56 44ms 27 days ago 39th Irratix 🇳🇱 860 57 39ms 29 Jun 2022 39th lacrosse 860 57 38ms 27 Nov 2025 41st tkr-sh 🇰🇵 845 58 37ms 8 Sep 2022 41st annaproxy 845 58 40ms 15 Sep 2023 41st Shanethegamer 🇺🇸 845 58 36ms 25 Dec 2023 41st emgordon154 845 58 39ms 26 Jul 2024 41st tatzyr 🇯🇵 845 58 43ms 10 Dec 2024 46th rniii 831 59 40ms 26 Mar 2024 46th ejini6969 831 59 38ms 13 Jun 2025 46th Laellekoenig 831 59 37ms 6 Nov 2025 49th DaCuteRaccoon 817 60 43ms 5 May 2022 49th razetime 817 60 38ms 22 Aug 2022 49th janbehrens 🇩🇪 817 60 37ms 17 May 2023 52nd fynnkroeger 803 61 39ms 6 Jan 2023 52nd aaronze 🇦🇺 803 61 39ms 17 Sep 2023 54th purp 790 62 35ms 13 Aug 2022 55th RuyiLi 778 63 37ms 21 Feb 2024 55th dokutan 778 63 41ms 15 Jul 2024 57th Waffle3z 766 64 38ms 6 May 2022 57th snoozingnewt 🇨🇦 766 64 41ms 25 Oct 2025 59th KatieLG 🇬🇧 754 65 42ms 26 Dec 2023 59th TheZwierzLF 🇵🇱 754 65 40ms 6 Jan 2026 61st Feniske 🇫🇷 742 66 40ms 8 Oct 2022 62nd adoxography 721 68 37ms 2 Mar 2024 63rd vrnprkh 700 70 35ms 30 Mar 2023 63rd truisseaux 700 70 39ms 12 Apr 2024 65th pfysches-boop 690 71 37ms 6 Aug 2023 65th madeforlosers 690 71 38ms 7 Nov 2024 67th beergit 681 72 38ms 7 Aug 2024 68th Ohh-n 671 73 38ms 9 Aug 2025 69th jamespeilunli 653 75 38ms 4 Jul 2022 70th kmathis22 628 78 38ms 5 Sep 2025 71st hollma 605 81 37ms 20 Oct 2023 72nd catflip 590 83 37ms 30 Nov 2023 73rd msbranicky 576 85 35ms 10 Oct 2023 74th Betuaredead 527 93 37ms 5 Jan 2023 75th yobatm 500 98 38ms 22 Aug 2025 76th sreedevk 🇺🇸 485 101 38ms 4 Dec 2022 77th JRaspass 🇬🇧 15 3,231 37ms 4 May 2022 77th KatieLG-Transpiler 🇬🇧 15 3,231 34ms 24 Jun 2022 77th retrohun 15 3,231 34ms 27 Dec 2022 77th HumanoidCPU 15 3,231 36ms 3 May 2024 1–80 of 82 Next 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