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 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 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 Transpose Sentence 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 Hilbert Curve Mandelbrot Minesweeper NFA Simulator Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Snake Sphenic Numbers Trinomial Triangle 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 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 Groovy Harbour Hare Haxe Hush Hy iogii Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua 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 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 Groovy Harbour Hare Haxe Hush Hy iogii Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua 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 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 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 Transpose Sentence 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 Hilbert Curve Mandelbrot Minesweeper NFA Simulator Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Snake Sphenic Numbers Trinomial Triangle Turtle Tutorial # Golfer Points Chars Time 826th raszpi 🇭🇺 838 77 1 Sep 2023 827th error256 838 81 13 Sep 2024 828th Codsilla 🇨🇦 837 51 1 Jul 2022 829th frankgraziano 836 66 20 Apr 2025 830th SirBogman 🇺🇸 836 89 4 May 2022 831st CatsAreFluffy 836 101 18 Feb 2023 831st annaproxy 836 101 9 May 2023 831st wojtekmal 836 101 15 Nov 2023 831st HumanoidCPU 836 101 6 May 2024 831st eMGeeneer 836 101 27 Jun 2024 831st bac0id 836 101 29 Jun 2024 837th eshilo-draper 835 75 6 Sep 2022 838th sean-niemann 🇺🇸 835 76 8 Oct 2024 839th Andriamanitra 🇫🇮 835 83 17 Apr 2023 839th Natanaelel 🇸🇪 835 83 8 Jul 2023 841st Smetalo 835 93 25 Aug 2022 841st malworthy 835 93 19 Aug 2024 843rd SirBogman 🇺🇸 834 36 5 May 2022 843rd HPWiz 🇳🇿 834 36 7 May 2022 843rd Natanaelel 🇸🇪 834 36 15 Jun 2022 843rd Steffan153 🇫🇮 834 36 18 Jan 2023 843rd codereport 🇨🇦 834 36 1 Jun 2024 843rd GolfinK 834 36 21 Nov 2024 843rd lifthrasiir 🇰🇷 834 36 1 Dec 2024 843rd GolfingSuccess 🇬🇷 834 36 20 Mar 2025 851st scpchicken 🇵🇼 834 55 4 May 2022 851st SirBogman 🇺🇸 834 55 5 May 2022 851st Shanethegamer 🇺🇸 834 55 19 May 2023 851st DialFrost 🇸🇬 834 55 14 Feb 2025 855th inverseLorentz 🇦🇺 834 69 3 Jun 2024 855th CLOStrophobic 🇮🇹 834 69 22 days ago 857th primo-ppcg 🇹🇭 834 216 23 Apr 2025 858th ChiefChippy2 833 56 4 May 2022 858th aksyristos 833 56 29 Jan 2023 858th anter69 🇭🇺 833 56 12 Feb 2024 858th 3dm4n 🇫🇮 833 56 11 Mar 2024 858th lgrandco 833 56 9 Oct 2024 858th tatzyr 🇯🇵 833 56 10 Dec 2024 864th moustave 833 67 7 Nov 2024 865th Alex-x90 🇺🇸 833 74 4 Dec 2022 865th undersquire 833 74 24 Jun 2023 865th rdmsr 833 74 24 Jun 2023 865th Bmrl7 833 74 9 Jul 2023 865th Vinterion 833 74 6 Nov 2023 865th namelessiw 833 74 28 Dec 2023 865th Jonatan6 🇩🇰 833 74 15 Mar 2024 865th Mandrzejy 🇵🇱 833 74 12 Apr 2024 865th kaurakeksi 🇫🇮 833 74 29 Dec 2024 874th CLOStrophobic 🇮🇹 833 89 14 Feb 2025 875th Steffan153 🇫🇮 833 97 18 Jan 2023 876th RyanMHsiao 833 159 24 Sep 2024 877th Steffan153 🇫🇮 832 55 21 Dec 2022 878th Shanethegamer 🇺🇸 832 57 15 Dec 2022 878th anter69 🇭🇺 832 57 23 Feb 2023 878th stefangimmillaro 832 57 6 May 2023 881st elisherer 🇮🇱 832 64 5 Jun 2022 881st Ashikpaul 🇮🇳 832 64 29 Jul 2022 881st LukeBridges 🇬🇧 832 64 26 Oct 2022 881st florton 832 64 18 Jan 2023 881st DayDun 🇸🇪 832 64 24 Jan 2023 881st lyphyser 832 64 3 Jun 2023 881st Davr1 🇨🇿 832 64 14 Oct 2023 881st stellartux 832 64 26 Dec 2023 881st goodwyna21 832 64 12 Nov 2024 881st xShadowBlade 832 64 26 Dec 2024 891st dokutan 832 88 9 Jun 2024 892nd MeWhenI 🇻🇦 832 101 5 May 2022 893rd Yewzir 🇧🇪 831 69 24 Dec 2024 894th nwellnhof 🇩🇪 831 117 16 Nov 2022 895th ovs-code 🇩🇪 830 60 3 Aug 2024 895th GrayJoKing 🇦🇺 830 60 24 Oct 2024 895th Shanethegamer 🇺🇸 830 60 19 Dec 2024 898th alphafalfa 830 65 23 Aug 2024 899th emplv 🇱🇻 830 124 31 Oct 2022 900th Natanaelel 🇸🇪 829 39 10 Feb 2025 Prev 826–900 of 3,076 Next