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 Submitted 817th Palladium02 846 63 12 May 2025 817th 4very 846 63 10 Jun 2025 817th gigaprofisi 🇺🇸 846 63 17 Jun 2025 817th Ultra814 846 63 21 Aug 2025 830th Natanaelel 🇸🇪 845 57 17 Jan 2024 830th Kacarott 🇦🇺 845 57 10 Sep 2024 830th albanian-laundromat 845 57 14 days ago 833rd NewDefectus 🇮🇱 845 73 6 May 2022 833rd inventshah 845 73 12 Jun 2022 833rd Natanaelel 🇸🇪 845 73 15 Jun 2022 833rd Herbert00709 🇵🇱 845 73 22 Dec 2023 833rd LorenzoDeGaspari 845 73 27 May 2024 833rd Bpc-CPU 845 73 12 Jul 2025 833rd AZTECCO 845 73 16 Sep 2025 833rd CaedenHarper 🇨🇦 845 73 23 days ago 841st lynn 845 96 30ms 11 Jul 2023 842nd Shanethegamer 🇺🇸 845 98 26 Oct 2022 842nd emgordon154 845 98 18 Feb 2025 844th jared-hughes 845 100 20 Jul 2022 844th ZakkkkAttackkkk 🇵🇭 845 100 10 Aug 2022 844th Walter225 845 100 25 Jul 2023 847th retrohun 844 64 6 Nov 2022 847th Re-Adventures 🇮🇳 844 64 7 Nov 2022 847th stellartux 844 64 26 Dec 2023 847th bac0id 844 64 29 Jun 2024 847th snoozingnewt 🇺🇸 844 64 1 Sep 2024 847th albanian-laundromat 844 64 22 Sep 2025 853rd janAkali 🇷🇺 843 77 12 Feb 2025 854th bschorno 843 92 12 Oct 2022 854th ChrisTheisen 843 92 14 Dec 2022 854th kellantech 843 92 4 Jul 2023 854th Mezzofloat 843 92 26 Aug 2023 854th Maximizer02 843 92 1 Oct 2023 854th madeforlosers 843 92 21 Nov 2024 854th ChromaChroma 843 92 14 days ago 854th snoozingnewt 🇺🇸 843 92 13 days ago 862nd DialFrost 🇸🇬 842 66 7 Apr 2025 863rd SirBogman 🇺🇸 842 89 4 May 2022 864th dokutan 842 93 24 days ago 865th KatieLG 🇬🇧 842 115 275ms 25 Sep 2022 865th emgordon154 842 115 273ms 17 Jan 2025 867th ovs-code 🇩🇪 842 161 14 Sep 2025 868th krcs 🇵🇱 841 53 9 May 2022 868th ryanlanegit 841 53 19 Jun 2022 868th sisyphus-ppcg 🇦🇺 841 53 15 Aug 2022 871st raszpi 🇭🇺 840 77 128ms 1 Sep 2023 872nd error256 840 81 13 Sep 2024 873rd eshilo-draper 839 75 6 Sep 2022 873rd kmathis22 839 75 5 Sep 2025 875th sean-niemann 🇺🇸 839 76 8 Oct 2024 876th frankgraziano 838 66 20 Apr 2025 877th emplv 🇱🇻 838 124 31 Oct 2022 878th Codsilla 🇨🇦 837 51 1 Jul 2022 879th Andriamanitra 🇫🇮 837 83 17 Apr 2023 879th Natanaelel 🇸🇪 837 83 8 Jul 2023 881st Steffan153 🇫🇮 837 97 33ms 18 Jan 2023 882nd CatsAreFluffy 837 101 18 Feb 2023 882nd annaproxy 837 101 9 May 2023 882nd wojtekmal 837 101 15 Nov 2023 882nd HumanoidCPU 837 101 6 May 2024 882nd eMGeeneer 837 101 27 Jun 2024 882nd bac0id 837 101 29 Jun 2024 882nd michaelmoynihan 837 101 3 Sep 2025 882nd snoozingnewt 🇺🇸 837 101 15 days ago 890th DialFrost 🇸🇬 837 162 13 Sep 2025 890th emgordon154 837 162 17 Sep 2025 892nd ovs-code 🇩🇪 836 85 11 Dec 2023 893rd dokutan 836 88 9 Jun 2024 894th CLOStrophobic 🇮🇹 836 89 14 Feb 2025 895th scpchicken 🇵🇼 835 55 4 May 2022 895th SirBogman 🇺🇸 835 55 5 May 2022 895th Shanethegamer 🇺🇸 835 55 19 May 2023 895th DialFrost 🇸🇬 835 55 14 Feb 2025 899th Yewzir 🇧🇪 835 69 24 Dec 2024 900th Re-Adventures 🇮🇳 835 116 278ms 16 Jul 2023 First Prev 826–900 of 3,383 Next Last