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 743rd xiaoyiming123 857 72 12 Jul 2025 752nd KatieLG 🇬🇧 857 115 25 Sep 2022 752nd emgordon154 857 115 17 Jan 2025 754th MeWhenI 🇻🇦 857 145 28 Mar 2025 755th typeswitch-dev 🇵🇹 855 75 22 Jul 2023 756th ovs-code 🇩🇪 855 83 1 Jul 2024 757th Liibe 855 97 7 days ago 757th Schmitt-Very-Cool 855 97 6 days ago 759th Frowny 854 38 5 May 2022 759th stackofbears 854 38 14 Mar 2025 761st DialFrost 🇸🇬 854 50 24 Oct 2023 762nd MeWhenI 🇻🇦 854 71 13 Dec 2022 763rd 386asm 🇺🇸 854 86 9 Apr 2023 764th henrydukepickle 853 97 8 Jul 2025 765th yeminghan2021 853 99 3 Feb 2025 766th eshilo-draper 852 91 4 Sep 2022 766th ericlangedijk 🇸🇮 852 91 23 May 2023 766th KatieLG 🇬🇧 852 91 30 Apr 2024 766th Mikey-Beep 🇬🇧 852 91 3 Sep 2024 770th o0lit3 🇺🇸 851 54 22 Jun 2023 770th Natanaelel 🇸🇪 851 54 10 Feb 2025 772nd Yewzir 🇧🇪 851 65 9 Oct 2023 772nd MeWhenI 🇻🇦 851 65 10 Oct 2023 774th frosster 851 76 12 May 2023 774th kyleclaassen 851 76 20 May 2023 774th RockOfStone 851 76 17 Mar 2024 774th NickTheEASDude 🇺🇸 851 76 7 May 2024 774th koipondx86 851 76 8 Nov 2024 779th Shanethegamer 🇺🇸 851 83 4 May 2022 780th mtirado1 850 74 24 Dec 2022 780th Betuaredead 850 74 6 Jan 2023 780th KatieLG 🇬🇧 850 74 15 Jan 2023 780th bwat2 850 74 31 Mar 2023 780th stackotter 850 74 29 May 2023 780th ovs-code 🇩🇪 850 74 17 Apr 2024 780th madeforlosers 850 74 21 Nov 2024 787th MeWhenI 🇻🇦 850 92 10 Oct 2022 787th Betuaredead 850 92 5 Jan 2023 787th emgordon154 850 92 27 May 2025 790th SirBogman 🇺🇸 849 55 5 May 2022 790th olivermrose 🇺🇸 849 55 6 May 2022 790th 4hg 🇺🇸 849 55 24 Aug 2022 790th DialFrost 🇸🇬 849 55 1 Jan 2023 790th error256 849 55 4 May 2024 795th Shanethegamer 🇺🇸 849 99 27 Apr 2023 796th Re-Adventures 🇮🇳 849 116 16 Jul 2023 796th Yewzir 🇧🇪 849 116 7 Feb 2024 798th Shanethegamer 🇺🇸 848 58 15 days ago 799th JayXon 🇺🇸 847 56 9 May 2022 800th MeWhenI 🇻🇦 846 26 25 Aug 2022 800th AlephSquirrel 846 26 6 Jan 2023 800th ovs-code 🇩🇪 846 26 5 May 2024 800th saito-ta 🇯🇵 846 26 12 Dec 2024 804th randolchance 846 63 8 Jan 2023 804th CatsAreFluffy 846 63 18 Feb 2023 804th amiralitaheri 846 63 23 Feb 2023 804th RuyiLi 846 63 1 Apr 2023 804th TaserTheFox 🇺🇸 846 63 25 May 2023 804th pfysches-boop 846 63 6 Aug 2023 804th mhgockel 846 63 19 Aug 2023 804th NickTheEASDude 🇺🇸 846 63 18 Jan 2024 804th 823126 846 63 14 Nov 2024 804th Palladium02 846 63 12 May 2025 804th 4very 846 63 10 Jun 2025 804th gigaprofisi 🇺🇸 846 63 17 Jun 2025 804th Ultra814 846 63 21 Aug 2025 804th alexsave 846 63 16 days ago 818th the-zammers 846 68 2 Oct 2023 819th NewDefectus 🇮🇱 845 73 6 May 2022 819th inventshah 845 73 12 Jun 2022 819th Natanaelel 🇸🇪 845 73 15 Jun 2022 819th Herbert00709 🇵🇱 845 73 22 Dec 2023 819th LorenzoDeGaspari 845 73 27 May 2024 819th Bpc-CPU 845 73 12 Jul 2025 819th AZTECCO 845 73 16 days ago First Prev 751–825 of 3,340 Next Last