Collatz in all languages in chars. 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 Chars Time 375th AlephSquirrel 903 93 21 Jan 2023 375th kg583 🇺🇸 903 93 26 Dec 2024 375th CLOStrophobic 🇮🇹 903 93 17 Jan 2025 375th edsrzf 🇳🇿 903 93 3 Jul 2025 380th Shanethegamer 🇺🇸 902 77 15 May 2023 381st krcs 🇵🇱 902 86 10 May 2022 381st billings7 🇬🇧 902 86 15 May 2022 381st revlayle 🇺🇸 902 86 7 Dec 2022 381st albanian-laundromat 902 86 21 days ago 385th m-tkach 🇺🇦 902 90 7 Dec 2023 386th shellbertt 🇨🇦 901 62 4 May 2022 386th ZakkkkAttackkkk 🇵🇭 901 62 5 May 2022 386th annaproxy 901 62 8 Jun 2022 386th bob-th 901 62 9 Jul 2022 386th btjones0 901 62 15 Jul 2022 386th tri1212 🇻🇳 901 62 18 Jul 2022 386th fredrik-bakke 🇳🇴 901 62 5 Oct 2022 386th jakobkordez 🇸🇮 901 62 19 Oct 2022 386th Fishron 901 62 29 Nov 2022 386th KatieLG 🇬🇧 901 62 11 Dec 2022 386th ItsMeNoobieboy 901 62 20 Dec 2022 386th firegene 🇮🇪 901 62 3 Jan 2023 386th ljweel 901 62 13 Feb 2023 386th 2011-Chan-Ethan 901 62 9 Jul 2023 386th elgan65536 901 62 18 Nov 2023 386th Dataen 901 62 16 Jan 2024 386th Yewzir 🇧🇪 901 62 5 Apr 2024 386th cuboids 901 62 11 Jul 2024 386th wuzekai518 901 62 26 Jul 2024 386th abhishekg999 901 62 17 Sep 2024 386th lifthrasiir 🇰🇷 901 62 16 Nov 2024 386th Artemis21 🇬🇧 901 62 17 Jan 2025 386th lolgeny 901 62 22 Feb 2025 386th keelimeguy 🇺🇸 901 62 15 May 2025 386th Flekay 🇩🇪 901 62 19 Jun 2025 386th DoubleUynn 901 62 25 Jun 2025 412th GolfingSuccess 🇬🇷 901 64 14 Dec 2024 412th MeWhenI 🇻🇦 901 64 24 Dec 2024 414th edsrzf 🇳🇿 901 72 3 Jul 2025 415th Betuaredead 900 60 5 Jan 2023 415th Yewzir 🇧🇪 900 60 12 Feb 2023 415th Steffan153 🇫🇮 900 60 23 Feb 2023 415th DialFrost 🇸🇬 900 60 30 Jul 2024 415th GolfingSuccess 🇬🇷 900 60 16 Oct 2024 415th sean-niemann 🇺🇸 900 60 7 Mar 2025 421st Lydxn 🇨🇦 900 64 1 Apr 2023 422nd DialFrost 🇸🇬 900 76 3 Aug 2025 423rd Kacarott 🇦🇺 900 79 13 Jun 2024 423rd kg583 🇺🇸 900 79 30 Jul 2025 425th stefangimmillaro 900 92 24 Oct 2023 425th inverseLorentz 🇦🇺 900 92 27 May 2024 425th sean-niemann 🇺🇸 900 92 8 Jun 2025 428th MeWhenI 🇻🇦 899 63 5 May 2022 429th Shanethegamer 🇺🇸 899 72 4 May 2022 429th jared-hughes 899 72 4 May 2022 429th Waffle3z 899 72 5 May 2022 429th Blendi-Goose 899 72 16 Mar 2025 429th edsrzf 🇳🇿 899 72 12 Apr 2025 429th sean-niemann 🇺🇸 899 72 4 days ago 435th michael-pruglo 🇺🇦 899 94 5 Jul 2022 435th zygoloid 899 94 5 Aug 2024 437th shinh 898 52 29 Jun 2022 437th MeWhenI 🇻🇦 898 52 25 Jul 2023 439th Lydxn 🇨🇦 898 70 7 May 2022 440th MeWhenI 🇻🇦 898 71 20 Aug 2024 441st m-tkach 🇺🇦 898 72 16 Oct 2022 441st GrayJoKing 🇦🇺 898 72 22 Oct 2022 441st emplv 🇱🇻 898 72 27 Oct 2022 441st sean-niemann 🇺🇸 898 72 7 Mar 2025 445th Steffan153 🇫🇮 897 82 1 Apr 2023 445th sean-niemann 🇺🇸 897 82 12 Jul 2024 447th edsrzf 🇳🇿 897 83 14 Jan 2025 447th kg583 🇺🇸 897 83 14 Feb 2025 449th albanian-laundromat 896 55 22 Sep 2025 450th sean-niemann 🇺🇸 896 108 25 May 2024 First Prev 376–450 of 3,383 Next Last