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 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 Calendar Connect Four CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers Minesweeper NFA Simulator Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers 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 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 Calendar Connect Four CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers Minesweeper NFA Simulator Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Turtle Tutorial # Golfer Points Bytes Time 526th marshallward 🇺🇸 909 83 10 May 2022 527th primo-ppcg 🇹🇭 909 93 7 May 2022 527th AlephSquirrel 909 93 21 Jan 2023 527th kg583 🇺🇸 909 93 26 Dec 2024 527th CLOStrophobic 🇮🇹 909 93 17 Jan 2025 527th edsrzf 🇳🇿 909 93 3 Jul 2025 532nd edsrzf 🇳🇿 908 72 3 Jul 2025 533rd DialFrost 🇸🇬 908 76 3 Aug 2025 534th ovs-code 🇩🇪 908 84 25 Sep 2022 534th GrayJoKing 🇦🇺 908 84 11 Aug 2023 536th m-tkach 🇺🇦 908 90 7 Dec 2023 537th KrausRaus 🇺🇸 907 59 4 May 2022 537th voytxt 🇨🇿 907 59 4 May 2022 537th KingSkyrock 🇺🇸 907 59 18 May 2022 537th ZakkkkAttackkkk 🇵🇭 907 59 14 Jul 2022 537th aksyristos 907 59 28 Oct 2022 537th nstearns96 🇬🇧 907 59 28 Nov 2022 537th janbehrens 🇩🇪 907 59 17 May 2023 537th Shanethegamer 🇺🇸 907 59 25 May 2023 537th Maznek 907 59 26 Jun 2023 537th SpiritAxolotl 🇺🇸 907 59 20 Mar 2024 537th Andrey-Plotnikov 907 59 19 May 2024 537th emgordon154 907 59 5 Aug 2024 537th duckyluuk 🇳🇱 907 59 3 Oct 2024 537th lifthrasiir 🇰🇷 907 59 23 Nov 2024 537th fuzzylojik-golf 🇺🇸 907 59 1 Jun 2025 537th acollett89 907 59 17 Jun 2025 537th iczelia 🇩🇪 907 59 23 Sep 2025 554th Betuaredead 907 60 5 Jan 2023 554th Yewzir 🇧🇪 907 60 12 Feb 2023 554th Steffan153 🇫🇮 907 60 23 Feb 2023 554th DialFrost 🇸🇬 907 60 30 Jul 2024 554th GolfingSuccess 🇬🇷 907 60 16 Oct 2024 554th sean-niemann 🇺🇸 907 60 7 Mar 2025 560th nipzu 906 48 8 Sep 2024 561st albanian-laundromat 906 55 22 Sep 2025 562nd Steffan153 🇫🇮 906 80 15 Nov 2022 562nd error256 906 80 8 Apr 2025 564th krcs 🇵🇱 906 86 10 May 2022 564th billings7 🇬🇧 906 86 15 May 2022 564th revlayle 🇺🇸 906 86 7 Dec 2022 564th Widgitty 906 86 1 Sep 2023 564th albanian-laundromat 906 86 21 days ago 569th shinh 905 52 29 Jun 2022 570th Lydxn 🇨🇦 905 64 1 Apr 2023 571st Lydxn 🇨🇦 905 70 7 May 2022 572nd MeWhenI 🇻🇦 905 71 20 Aug 2024 573rd Shanethegamer 🇺🇸 905 82 19 Dec 2023 573rd edsrzf 🇳🇿 905 82 6 Jan 2025 575th Shanethegamer 🇺🇸 904 72 4 May 2022 575th jared-hughes 904 72 4 May 2022 575th Waffle3z 904 72 5 May 2022 575th m-tkach 🇺🇦 904 72 16 Oct 2022 575th GrayJoKing 🇦🇺 904 72 22 Oct 2022 575th emplv 🇱🇻 904 72 27 Oct 2022 575th sean-niemann 🇺🇸 904 72 7 Mar 2025 575th Blendi-Goose 904 72 16 Mar 2025 575th edsrzf 🇳🇿 904 72 12 Apr 2025 575th sean-niemann 🇺🇸 904 72 5 days ago 585th edsrzf 🇳🇿 904 83 14 Jan 2025 585th kg583 🇺🇸 904 83 14 Feb 2025 587th Steffan153 🇫🇮 903 82 1 Apr 2023 587th sean-niemann 🇺🇸 903 82 12 Jul 2024 589th stefangimmillaro 903 92 24 Oct 2023 589th inverseLorentz 🇦🇺 903 92 27 May 2024 589th sean-niemann 🇺🇸 903 92 8 Jun 2025 592nd Lydxn 🇨🇦 902 69 12 Sep 2022 592nd GrayJoKing 🇦🇺 902 69 12 Sep 2022 592nd btnlq 902 69 24 Sep 2022 595th michael-pruglo 🇺🇦 902 94 5 Jul 2022 595th zygoloid 902 94 5 Aug 2024 597th TobyBoyne 🇬🇧 901 74 4 May 2022 597th RDShah 901 74 6 May 2022 597th Indivicivet 901 74 9 May 2022 597th CedricGebistorf 901 74 9 May 2022 First Prev 526–600 of 3,406 Next Last