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 819th CaedenHarper 🇨🇦 845 73 4 days ago 827th lynn 845 96 11 Jul 2023 828th Shanethegamer 🇺🇸 845 98 26 Oct 2022 828th emgordon154 845 98 18 Feb 2025 830th jared-hughes 845 100 20 Jul 2022 830th ZakkkkAttackkkk 🇵🇭 845 100 10 Aug 2022 830th Walter225 845 100 25 Jul 2023 833rd Natanaelel 🇸🇪 844 57 17 Jan 2024 833rd Kacarott 🇦🇺 844 57 10 Sep 2024 835th retrohun 844 64 6 Nov 2022 835th Re-Adventures 🇮🇳 844 64 7 Nov 2022 835th stellartux 844 64 26 Dec 2023 835th bac0id 844 64 29 Jun 2024 835th snoozingnewt 🇺🇸 844 64 1 Sep 2024 835th albanian-laundromat 844 64 10 days ago 841st janAkali 🇷🇺 843 77 12 Feb 2025 842nd bschorno 843 92 12 Oct 2022 842nd ChrisTheisen 843 92 14 Dec 2022 842nd kellantech 843 92 4 Jul 2023 842nd Mezzofloat 843 92 26 Aug 2023 842nd Maximizer02 843 92 1 Oct 2023 842nd madeforlosers 843 92 21 Nov 2024 848th DialFrost 🇸🇬 842 66 7 Apr 2025 849th SirBogman 🇺🇸 842 89 4 May 2022 850th ovs-code 🇩🇪 842 161 18 days ago 851st krcs 🇵🇱 841 53 9 May 2022 851st ryanlanegit 841 53 19 Jun 2022 851st sisyphus-ppcg 🇦🇺 841 53 15 Aug 2022 854th dokutan 841 93 5 days ago 855th eshilo-draper 839 75 6 Sep 2022 855th kmathis22 839 75 27 days ago 857th sean-niemann 🇺🇸 839 76 8 Oct 2024 858th raszpi 🇭🇺 839 77 1 Sep 2023 859th frankgraziano 838 66 20 Apr 2025 860th error256 838 81 13 Sep 2024 861st Codsilla 🇨🇦 837 51 1 Jul 2022 862nd Andriamanitra 🇫🇮 837 83 17 Apr 2023 862nd Natanaelel 🇸🇪 837 83 8 Jul 2023 864th Steffan153 🇫🇮 837 97 18 Jan 2023 865th DialFrost 🇸🇬 837 162 19 days ago 865th emgordon154 837 162 15 days ago 867th CLOStrophobic 🇮🇹 836 89 14 Feb 2025 868th CatsAreFluffy 836 101 18 Feb 2023 868th annaproxy 836 101 9 May 2023 868th wojtekmal 836 101 15 Nov 2023 868th HumanoidCPU 836 101 6 May 2024 868th eMGeeneer 836 101 27 Jun 2024 868th bac0id 836 101 29 Jun 2024 868th michaelmoynihan 836 101 3 Sep 2025 875th emplv 🇱🇻 836 124 31 Oct 2022 876th scpchicken 🇵🇼 835 55 4 May 2022 876th SirBogman 🇺🇸 835 55 5 May 2022 876th Shanethegamer 🇺🇸 835 55 19 May 2023 876th DialFrost 🇸🇬 835 55 14 Feb 2025 880th Yewzir 🇧🇪 835 69 24 Dec 2024 881st ovs-code 🇩🇪 835 85 11 Dec 2023 882nd cduerm 835 118 13 days ago 883rd SirBogman 🇺🇸 834 36 5 May 2022 883rd HPWiz 🇳🇿 834 36 7 May 2022 883rd Natanaelel 🇸🇪 834 36 15 Jun 2022 883rd Steffan153 🇫🇮 834 36 18 Jan 2023 883rd codereport 🇨🇦 834 36 1 Jun 2024 883rd GolfinK 834 36 21 Nov 2024 883rd lifthrasiir 🇰🇷 834 36 1 Dec 2024 883rd GolfingSuccess 🇬🇷 834 36 20 Mar 2025 891st ChiefChippy2 834 56 4 May 2022 891st aksyristos 834 56 29 Jan 2023 891st anter69 🇭🇺 834 56 12 Feb 2024 891st 3dm4n 🇫🇮 834 56 11 Mar 2024 891st lgrandco 834 56 9 Oct 2024 891st tatzyr 🇯🇵 834 56 10 Dec 2024 897th moustave 834 67 7 Nov 2024 898th inverseLorentz 🇦🇺 834 69 3 Jun 2024 898th CLOStrophobic 🇮🇹 834 69 28 May 2025 900th Shanethegamer 🇺🇸 834 82 15 May 2023 Prev 826–900 of 3,339 Next