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 815th gigaprofisi 🇺🇸 846 63 17 Jun 2025 815th Ultra814 846 63 21 Aug 2025 828th Natanaelel 🇸🇪 845 57 17 Jan 2024 828th Kacarott 🇦🇺 845 57 10 Sep 2024 828th albanian-laundromat 845 57 10 days ago 831st NewDefectus 🇮🇱 845 73 6 May 2022 831st inventshah 845 73 12 Jun 2022 831st Natanaelel 🇸🇪 845 73 15 Jun 2022 831st Herbert00709 🇵🇱 845 73 22 Dec 2023 831st LorenzoDeGaspari 845 73 27 May 2024 831st Bpc-CPU 845 73 12 Jul 2025 831st AZTECCO 845 73 16 Sep 2025 831st CaedenHarper 🇨🇦 845 73 19 days ago 839th lynn 845 96 11 Jul 2023 840th Shanethegamer 🇺🇸 845 98 26 Oct 2022 840th emgordon154 845 98 18 Feb 2025 842nd jared-hughes 845 100 20 Jul 2022 842nd ZakkkkAttackkkk 🇵🇭 845 100 10 Aug 2022 842nd Walter225 845 100 25 Jul 2023 845th retrohun 844 64 6 Nov 2022 845th Re-Adventures 🇮🇳 844 64 7 Nov 2022 845th stellartux 844 64 26 Dec 2023 845th bac0id 844 64 29 Jun 2024 845th snoozingnewt 🇺🇸 844 64 1 Sep 2024 845th albanian-laundromat 844 64 25 days ago 851st janAkali 🇷🇺 843 77 12 Feb 2025 852nd bschorno 843 92 12 Oct 2022 852nd ChrisTheisen 843 92 14 Dec 2022 852nd kellantech 843 92 4 Jul 2023 852nd Mezzofloat 843 92 26 Aug 2023 852nd Maximizer02 843 92 1 Oct 2023 852nd madeforlosers 843 92 21 Nov 2024 852nd ChromaChroma 843 92 10 days ago 852nd snoozingnewt 🇺🇸 843 92 9 days ago 860th DialFrost 🇸🇬 842 66 7 Apr 2025 861st SirBogman 🇺🇸 842 89 4 May 2022 862nd dokutan 842 93 20 days ago 863rd KatieLG 🇬🇧 842 115 25 Sep 2022 863rd emgordon154 842 115 17 Jan 2025 865th ovs-code 🇩🇪 842 161 14 Sep 2025 866th krcs 🇵🇱 841 53 9 May 2022 866th ryanlanegit 841 53 19 Jun 2022 866th sisyphus-ppcg 🇦🇺 841 53 15 Aug 2022 869th raszpi 🇭🇺 840 77 1 Sep 2023 870th error256 840 81 13 Sep 2024 871st eshilo-draper 839 75 6 Sep 2022 871st kmathis22 839 75 5 Sep 2025 873rd sean-niemann 🇺🇸 839 76 8 Oct 2024 874th frankgraziano 838 66 20 Apr 2025 875th emplv 🇱🇻 838 124 31 Oct 2022 876th Codsilla 🇨🇦 837 51 1 Jul 2022 877th Andriamanitra 🇫🇮 837 83 17 Apr 2023 877th Natanaelel 🇸🇪 837 83 8 Jul 2023 879th Steffan153 🇫🇮 837 97 18 Jan 2023 880th CatsAreFluffy 837 101 18 Feb 2023 880th annaproxy 837 101 9 May 2023 880th wojtekmal 837 101 15 Nov 2023 880th HumanoidCPU 837 101 6 May 2024 880th eMGeeneer 837 101 27 Jun 2024 880th bac0id 837 101 29 Jun 2024 880th michaelmoynihan 837 101 3 Sep 2025 880th snoozingnewt 🇺🇸 837 101 11 days ago 888th DialFrost 🇸🇬 837 162 13 Sep 2025 888th emgordon154 837 162 17 Sep 2025 890th ovs-code 🇩🇪 836 85 11 Dec 2023 891st dokutan 836 88 9 Jun 2024 892nd CLOStrophobic 🇮🇹 836 89 14 Feb 2025 893rd scpchicken 🇵🇼 835 55 4 May 2022 893rd SirBogman 🇺🇸 835 55 5 May 2022 893rd Shanethegamer 🇺🇸 835 55 19 May 2023 893rd DialFrost 🇸🇬 835 55 14 Feb 2025 897th Yewzir 🇧🇪 835 69 24 Dec 2024 898th Re-Adventures 🇮🇳 835 116 16 Jul 2023 898th Yewzir 🇧🇪 835 116 7 Feb 2024 900th SirBogman 🇺🇸 834 36 5 May 2022 First Prev 826–900 of 3,375 Next Last