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 814th Ultra814 846 63 21 Aug 2025 827th Natanaelel 🇸🇪 845 57 17 Jan 2024 827th Kacarott 🇦🇺 845 57 10 Sep 2024 827th albanian-laundromat 845 57 10 days ago 830th NewDefectus 🇮🇱 845 73 6 May 2022 830th inventshah 845 73 12 Jun 2022 830th Natanaelel 🇸🇪 845 73 15 Jun 2022 830th Herbert00709 🇵🇱 845 73 22 Dec 2023 830th LorenzoDeGaspari 845 73 27 May 2024 830th Bpc-CPU 845 73 12 Jul 2025 830th AZTECCO 845 73 16 Sep 2025 830th CaedenHarper 🇨🇦 845 73 19 days ago 838th lynn 845 96 11 Jul 2023 839th Shanethegamer 🇺🇸 845 98 26 Oct 2022 839th emgordon154 845 98 18 Feb 2025 841st jared-hughes 845 100 20 Jul 2022 841st ZakkkkAttackkkk 🇵🇭 845 100 10 Aug 2022 841st Walter225 845 100 25 Jul 2023 844th retrohun 844 64 6 Nov 2022 844th Re-Adventures 🇮🇳 844 64 7 Nov 2022 844th stellartux 844 64 26 Dec 2023 844th bac0id 844 64 29 Jun 2024 844th snoozingnewt 🇺🇸 844 64 1 Sep 2024 844th albanian-laundromat 844 64 25 days ago 850th janAkali 🇷🇺 843 77 12 Feb 2025 851st bschorno 843 92 12 Oct 2022 851st ChrisTheisen 843 92 14 Dec 2022 851st kellantech 843 92 4 Jul 2023 851st Mezzofloat 843 92 26 Aug 2023 851st Maximizer02 843 92 1 Oct 2023 851st madeforlosers 843 92 21 Nov 2024 851st ChromaChroma 843 92 9 days ago 851st snoozingnewt 🇺🇸 843 92 8 days ago 859th DialFrost 🇸🇬 842 66 7 Apr 2025 860th SirBogman 🇺🇸 842 89 4 May 2022 861st dokutan 842 93 20 days ago 862nd KatieLG 🇬🇧 842 115 25 Sep 2022 862nd emgordon154 842 115 17 Jan 2025 864th ovs-code 🇩🇪 842 161 14 Sep 2025 865th krcs 🇵🇱 841 53 9 May 2022 865th ryanlanegit 841 53 19 Jun 2022 865th sisyphus-ppcg 🇦🇺 841 53 15 Aug 2022 868th raszpi 🇭🇺 840 77 1 Sep 2023 869th error256 840 81 13 Sep 2024 870th eshilo-draper 839 75 6 Sep 2022 870th kmathis22 839 75 5 Sep 2025 872nd sean-niemann 🇺🇸 839 76 8 Oct 2024 873rd frankgraziano 838 66 20 Apr 2025 874th emplv 🇱🇻 838 124 31 Oct 2022 875th Codsilla 🇨🇦 837 51 1 Jul 2022 876th Andriamanitra 🇫🇮 837 83 17 Apr 2023 876th Natanaelel 🇸🇪 837 83 8 Jul 2023 878th Steffan153 🇫🇮 837 97 18 Jan 2023 879th CatsAreFluffy 837 101 18 Feb 2023 879th annaproxy 837 101 9 May 2023 879th wojtekmal 837 101 15 Nov 2023 879th HumanoidCPU 837 101 6 May 2024 879th eMGeeneer 837 101 27 Jun 2024 879th bac0id 837 101 29 Jun 2024 879th michaelmoynihan 837 101 3 Sep 2025 879th snoozingnewt 🇺🇸 837 101 10 days ago 887th DialFrost 🇸🇬 837 162 13 Sep 2025 887th emgordon154 837 162 17 Sep 2025 889th ovs-code 🇩🇪 836 85 11 Dec 2023 890th dokutan 836 88 9 Jun 2024 891st CLOStrophobic 🇮🇹 836 89 14 Feb 2025 892nd scpchicken 🇵🇼 835 55 4 May 2022 892nd SirBogman 🇺🇸 835 55 5 May 2022 892nd Shanethegamer 🇺🇸 835 55 19 May 2023 892nd DialFrost 🇸🇬 835 55 14 Feb 2025 896th Yewzir 🇧🇪 835 69 24 Dec 2024 897th Re-Adventures 🇮🇳 835 116 16 Jul 2023 897th Yewzir 🇧🇪 835 116 7 Feb 2024 899th SirBogman 🇺🇸 834 36 5 May 2022 899th HPWiz 🇳🇿 834 36 7 May 2022 First Prev 826–900 of 3,374 Next Last