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 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 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 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 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 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 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 Snake Sphenic Numbers Trinomial Triangle Turtle Tutorial # Golfer Points Chars Time 822nd error256 849 55 4 May 2024 827th mtirado1 849 74 24 Dec 2022 827th Betuaredead 849 74 6 Jan 2023 827th KatieLG 🇬🇧 849 74 15 Jan 2023 827th bwat2 849 74 31 Mar 2023 827th stackotter 849 74 29 May 2023 827th ovs-code 🇩🇪 849 74 17 Apr 2024 827th madeforlosers 849 74 21 Nov 2024 834th Shanethegamer 🇺🇸 849 99 27 Apr 2023 835th Re-Adventures 🇮🇳 848 116 16 Jul 2023 835th Yewzir 🇧🇪 848 116 7 Feb 2024 837th azka1368 848 138 23 Nov 2023 838th JayXon 🇺🇸 847 56 9 May 2022 839th MeWhenI 🇻🇦 846 26 25 Aug 2022 839th AlephSquirrel 846 26 6 Jan 2023 839th ovs-code 🇩🇪 846 26 5 May 2024 839th saito-ta 🇯🇵 846 26 12 Dec 2024 843rd Shanethegamer 🇺🇸 846 59 4 days ago 843rd albanian-laundromat 846 59 2 days ago 845th the-zammers 846 68 2 Oct 2023 846th randolchance 845 63 8 Jan 2023 846th CatsAreFluffy 845 63 18 Feb 2023 846th amiralitaheri 845 63 23 Feb 2023 846th RuyiLi 845 63 1 Apr 2023 846th TaserTheFox 🇺🇸 845 63 25 May 2023 846th pfysches-boop 845 63 6 Aug 2023 846th mhgockel 845 63 19 Aug 2023 846th NickTheEASDude 🇺🇸 845 63 18 Jan 2024 846th 823126 845 63 14 Nov 2024 846th Palladium02 845 63 12 May 2025 846th 4very 845 63 10 Jun 2025 846th gigaprofisi 🇺🇸 845 63 17 Jun 2025 846th Ultra814 845 63 12 days ago 859th NewDefectus 🇮🇱 845 73 6 May 2022 859th inventshah 845 73 12 Jun 2022 859th Natanaelel 🇸🇪 845 73 15 Jun 2022 859th Herbert00709 🇵🇱 845 73 22 Dec 2023 859th LorenzoDeGaspari 845 73 27 May 2024 859th Bpc-CPU 845 73 12 Jul 2025 865th lynn 844 96 11 Jul 2023 866th Shanethegamer 🇺🇸 844 98 26 Oct 2022 866th emgordon154 844 98 18 Feb 2025 868th jared-hughes 844 100 20 Jul 2022 868th ZakkkkAttackkkk 🇵🇭 844 100 10 Aug 2022 868th Walter225 844 100 25 Jul 2023 871st Natanaelel 🇸🇪 843 57 17 Jan 2024 871st Kacarott 🇦🇺 843 57 10 Sep 2024 873rd retrohun 843 64 6 Nov 2022 873rd Re-Adventures 🇮🇳 843 64 7 Nov 2022 873rd stellartux 843 64 26 Dec 2023 873rd bac0id 843 64 29 Jun 2024 873rd snoozingnewt 🇺🇸 843 64 1 Sep 2024 878th janAkali 🇷🇺 843 77 12 Feb 2025 879th bschorno 843 92 12 Oct 2022 879th ChrisTheisen 843 92 14 Dec 2022 879th kellantech 843 92 4 Jul 2023 879th Mezzofloat 843 92 26 Aug 2023 879th Maximizer02 843 92 1 Oct 2023 879th madeforlosers 843 92 21 Nov 2024 885th DialFrost 🇸🇬 842 66 7 Apr 2025 886th Smetalo 842 139 25 Aug 2022 886th ToxicP1e 842 139 2 Mar 2023 888th krcs 🇵🇱 841 53 9 May 2022 888th ryanlanegit 841 53 19 Jun 2022 888th sisyphus-ppcg 🇦🇺 841 53 15 Aug 2022 891st SirBogman 🇺🇸 841 89 4 May 2022 892nd raszpi 🇭🇺 839 77 1 Sep 2023 893rd sean-niemann 🇺🇸 838 76 8 Oct 2024 894th error256 838 81 13 Sep 2024 895th Codsilla 🇨🇦 837 51 1 Jul 2022 896th frankgraziano 837 66 20 Apr 2025 897th eshilo-draper 837 75 6 Sep 2022 898th CatsAreFluffy 836 101 18 Feb 2023 898th annaproxy 836 101 9 May 2023 898th wojtekmal 836 101 15 Nov 2023 Prev 826–900 of 3,272 Next