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 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 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 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 Hilbert Curve Mandelbrot Minesweeper NFA Simulator Odd Polyomino Tiling p-adic Expansion 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 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 Groovy Harbour Hare Haxe Hush Hy iogii Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua 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 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 Groovy Harbour Hare Haxe Hush Hy iogii Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua 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 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 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 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 Hilbert Curve Mandelbrot Minesweeper NFA Simulator Odd Polyomino Tiling p-adic Expansion QR Encoder Quadratic Formula Semiprime Numbers Snake Sphenic Numbers Trinomial Triangle Turtle Tutorial # Golfer Points Chars Time 747th error256 848 55 4 May 2024 752nd JayXon 🇺🇸 847 56 9 May 2022 753rd Re-Adventures 🇮🇳 847 116 16 Jul 2023 753rd Yewzir 🇧🇪 847 116 7 Feb 2024 755th azka1368 847 138 23 Nov 2023 755th Schmitt-Very-Cool 847 138 19 Jul 2024 757th MeWhenI 🇻🇦 846 26 25 Aug 2022 757th AlephSquirrel 846 26 6 Jan 2023 757th ovs-code 🇩🇪 846 26 5 May 2024 757th saito-ta 🇯🇵 846 26 12 Dec 2024 761st mossiegoat 846 66 4 days ago 762nd the-zammers 846 68 2 Oct 2023 763rd mtirado1 846 74 24 Dec 2022 763rd Betuaredead 846 74 6 Jan 2023 763rd KatieLG 🇬🇧 846 74 15 Jan 2023 763rd bwat2 846 74 31 Mar 2023 763rd stackotter 846 74 29 May 2023 763rd ovs-code 🇩🇪 846 74 17 Apr 2024 763rd madeforlosers 846 74 21 Nov 2024 770th randolchance 845 63 8 Jan 2023 770th CatsAreFluffy 845 63 18 Feb 2023 770th amiralitaheri 845 63 23 Feb 2023 770th RuyiLi 845 63 1 Apr 2023 770th TaserTheFox 🇺🇸 845 63 25 May 2023 770th pfysches-boop 845 63 6 Aug 2023 770th mhgockel 845 63 19 Aug 2023 770th NickTheEASDude 🇺🇸 845 63 18 Jan 2024 770th 823126 845 63 14 Nov 2024 770th Palladium02 845 63 20 days ago 780th NewDefectus 🇮🇱 844 73 6 May 2022 780th inventshah 844 73 12 Jun 2022 780th Natanaelel 🇸🇪 844 73 15 Jun 2022 780th 5quiwyrm 844 73 19 Oct 2022 780th Herbert00709 🇵🇱 844 73 22 Dec 2023 780th LorenzoDeGaspari 844 73 27 May 2024 786th bschorno 844 92 12 Oct 2022 786th kellantech 844 92 4 Jul 2023 786th Mezzofloat 844 92 26 Aug 2023 786th Maximizer02 844 92 1 Oct 2023 786th michelebastione 🇮🇹 844 92 22 Dec 2023 786th madeforlosers 844 92 21 Nov 2024 792nd jared-hughes 844 100 20 Jul 2022 792nd ZakkkkAttackkkk 🇵🇭 844 100 10 Aug 2022 792nd Walter225 844 100 25 Jul 2023 795th Natanaelel 🇸🇪 843 57 17 Jan 2024 795th Kacarott 🇦🇺 843 57 10 Sep 2024 797th retrohun 843 64 6 Nov 2022 797th Re-Adventures 🇮🇳 843 64 7 Nov 2022 797th stellartux 843 64 26 Dec 2023 797th bac0id 843 64 29 Jun 2024 797th snoozingnewt 🇺🇸 843 64 1 Sep 2024 802nd DialFrost 🇸🇬 843 86 15 Dec 2024 803rd Shanethegamer 🇺🇸 843 98 26 Oct 2022 803rd emgordon154 843 98 18 Feb 2025 805th krcs 🇵🇱 841 53 9 May 2022 805th ryanlanegit 841 53 19 Jun 2022 805th sisyphus-ppcg 🇦🇺 841 53 15 Aug 2022 808th DialFrost 🇸🇬 841 66 7 Apr 2025 809th Shanethegamer 🇺🇸 841 82 15 May 2023 810th lynn 841 96 11 Jul 2023 811th Smetalo 841 139 25 Aug 2022 811th ToxicP1e 841 139 2 Mar 2023 811th TheZwierzLF 🇵🇱 841 139 28 hours ago 814th janAkali 🇷🇺 840 77 12 Feb 2025 815th raszpi 🇭🇺 838 77 1 Sep 2023 816th error256 838 81 13 Sep 2024 817th Codsilla 🇨🇦 837 51 1 Jul 2022 818th frankgraziano 836 66 20 Apr 2025 819th SirBogman 🇺🇸 836 89 4 May 2022 820th eshilo-draper 835 75 6 Sep 2022 821st Andriamanitra 🇫🇮 835 83 17 Apr 2023 821st Natanaelel 🇸🇪 835 83 8 Jul 2023 823rd Smetalo 835 93 25 Aug 2022 823rd malworthy 835 93 19 Aug 2024 823rd 123mjb 835 93 17 Oct 2024 Prev 751–825 of 3,055 Next