Collatz in all languages in bytes. Cheevos Holes Recent Holes Langs Medals Misc 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 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 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 Tower of Hanoi Turtle Tutorial All Languages ><> Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir 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 Erlang 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 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 Erlang 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 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 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 Tower of Hanoi Turtle Tutorial # Golfer Points Bytes Time Submitted 586th betaveros 883 70 18ms 9 Aug 2022 586th shelerr 883 70 20ms 9 Sep 2022 586th stewSquared 🇺🇸 883 70 30ms 27 Sep 2022 586th orthoplex 🇨🇽 883 70 24ms 9 Oct 2022 586th 5quiwyrm 883 70 21ms 19 Oct 2022 586th myfatemi04 883 70 18ms 4 Nov 2022 586th kevinmchung 883 70 19ms 4 Nov 2022 586th FlorianCassayre 🇫🇷 883 70 19ms 7 Nov 2022 586th fourth-bit 883 70 21ms 29 Nov 2022 586th QuincyNash 🇺🇸 883 70 19ms 29 Nov 2022 586th aksyristos 883 70 31ms 25 Dec 2022 586th thizanne 883 70 19ms 27 Dec 2022 586th Alex-x90 🇺🇸 883 70 26ms 20 Jan 2023 586th bob-th 883 70 20ms 24 Jan 2023 586th SirFireball3521 883 70 19ms 25 Jan 2023 586th stefangimmillaro 883 70 20ms 6 Feb 2023 586th Seek64 🇩🇪 883 70 18ms 7 Feb 2023 586th FieryIceStickie 883 70 19ms 3 Apr 2023 586th MeWhenI 🇻🇦 883 70 18ms 30 Apr 2023 586th fgrosshans 🇫🇷 883 70 20ms 5 May 2023 586th Shanethegamer 🇺🇸 883 70 21ms 25 May 2023 586th InigoK 🇺🇸 883 70 18ms 14 Jun 2023 586th quimey 883 70 16ms 15 Jun 2023 586th CornerMercury 🇬🇧 883 70 20ms 19 Jun 2023 586th ndren 883 70 19ms 2 Aug 2023 586th bizy-coder 883 70 22ms 14 Aug 2023 586th janbehrens 🇩🇪 883 70 19ms 24 Nov 2023 586th namelessiw 883 70 19ms 9 Jan 2024 586th mathisfun271 883 70 18ms 13 Feb 2024 586th Just4FunCoder 883 70 19ms 17 Feb 2024 586th ThijsLuttikhuis 883 70 26ms 3 Mar 2024 586th elgan65536 883 70 20ms 5 Mar 2024 586th jtaxen 883 70 22ms 1 Apr 2024 586th HumanoidCPU 883 70 29ms 6 May 2024 586th abc7-12 883 70 18ms 6 May 2024 586th ahmetdemirag 🇨🇾 883 70 19ms 9 Jun 2024 586th FranklinJiaChen 883 70 19ms 4 Jul 2024 586th 5cw 🇺🇸 883 70 18ms 13 Jul 2024 586th CaedenHarper 🇨🇦 883 70 18ms 3 Aug 2024 586th emgordon154 883 70 26ms 5 Aug 2024 586th dokutan 883 70 19ms 9 Aug 2024 586th jatloe 883 70 19ms 26 Aug 2024 586th lgrandco 883 70 18ms 9 Oct 2024 586th snydej 883 70 19ms 21 Nov 2024 586th erikji 883 70 19ms 4 Feb 2025 586th CutSandstone 883 70 20ms 4 Feb 2025 586th albanian-laundromat 883 70 18ms 12 Apr 2025 586th xsot 🇸🇬 883 70 20ms 3 May 2025 586th fuzzylojik-golf 🇺🇸 883 70 19ms 14 Jun 2025 586th smilesformiles3 883 70 22ms 14 Jun 2025 586th KasperKivimaeki 🇫🇮 883 70 19ms 30 Jun 2025 586th adaGrad1 883 70 20ms 10 Aug 2025 586th EthanJantz 883 70 18ms 10 Aug 2025 586th qpwoeirut 883 70 16ms 10 Aug 2025 586th katss2 883 70 19ms 17 Aug 2025 586th intgrah 883 70 22ms 23 Sep 2025 586th ryyyn 🇺🇸 883 70 20ms 19 days ago 586th luuumine 🇫🇷 883 70 19ms 14 days ago 586th Babafaba 883 70 18ms 10 days ago 586th commandblockguy 🇺🇸 883 70 22ms 45 hours ago 661st Irratix 🇳🇱 883 96 53ms 4 May 2022 661st MeWhenI 🇻🇦 883 96 56ms 1 Jun 2022 661st janbehrens 🇩🇪 883 96 54ms 21 Apr 2023 661st Shanethegamer 🇺🇸 883 96 56ms 15 May 2023 661st Yewzir 🇧🇪 883 96 57ms 11 Nov 2023 661st MateuszPietrzak 🇵🇱 883 96 56ms 18 Nov 2023 661st kkoenig 883 96 55ms 21 Dec 2023 661st BlankSpruce 883 96 56ms 20 Aug 2024 661st fuzzylojik-golf 🇺🇸 883 96 63ms 14 Jun 2025 670th Shanethegamer 🇺🇸 882 51 405ms 15 May 2023 671st GrayJoKing 🇦🇺 882 60 142ms 24 Oct 2024 672nd Shanethegamer 🇺🇸 881 73 90ms 8 May 2025 672nd DialFrost 🇸🇬 881 73 100ms 3 Jun 2025 672nd edsrzf 🇳🇿 881 73 101ms 4 Jul 2025 675th GrayJoKing 🇦🇺 881 84 53ms 19 Jun 2022 First Prev 601–675 of 3,471 Next Last