Collatz in all languages in bytes. 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 Minesweeper 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 Binary Lambda Calculus Calendar Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Tower of Hanoi 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 Minesweeper 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 Binary Lambda Calculus Calendar Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Tower of Hanoi Turtle Tutorial # Golfer Points Bytes Time Submitted 826th HPWiz 🇳🇿 862 50 259ms 4 May 2022 826th JayXon 🇺🇸 862 50 274ms 5 May 2022 826th Steffan153 🇫🇮 862 50 303ms 10 Dec 2022 826th ovs-code 🇩🇪 862 50 407ms 24 Oct 2023 826th sean-niemann 🇺🇸 862 50 254ms 12 Jul 2024 831st typeswitch-dev 🇵🇹 862 75 5ms 22 Jul 2023 832nd ovs-code 🇩🇪 862 161 1,597ms 14 Sep 2025 832nd Yewzir 🇧🇪 862 161 1,672ms 3 days ago 834th Shanethegamer 🇺🇸 861 58 790ms 17 Sep 2025 835th NewDefectus 🇮🇱 861 73 3ms 6 May 2022 835th Natanaelel 🇸🇪 861 73 2ms 15 Jun 2022 835th LorenzoDeGaspari 861 73 3ms 27 May 2024 835th Bpc-CPU 861 73 2ms 12 Jul 2025 835th AZTECCO 861 73 3ms 16 Sep 2025 835th CaedenHarper 🇨🇦 861 73 3ms 28 Sep 2025 841st 386asm 🇺🇸 861 86 45ms 9 Apr 2023 842nd o0lit3 🇺🇸 859 54 8ms 22 Jun 2023 842nd Natanaelel 🇸🇪 859 54 8ms 10 Feb 2025 844th scpchicken 🇵🇼 859 72 20ms 4 May 2022 844th sultan 859 72 16ms 6 Jun 2022 844th annaproxy 859 72 21ms 22 Aug 2022 844th BlankSpruce 859 72 27ms 9 Sep 2022 844th ValentinCassayre 859 72 20ms 8 Oct 2022 844th mathb0y512 859 72 21ms 1 Dec 2022 844th NoahBolohan 🇨🇦 859 72 23ms 28 Feb 2023 844th neel11235813 859 72 19ms 8 Mar 2023 844th Kacarott 🇦🇺 859 72 15ms 24 Mar 2023 844th Fracture17 859 72 20ms 8 Apr 2023 844th ayushdewan 859 72 24ms 7 May 2023 844th PeterTillema 🇳🇱 859 72 24ms 17 Oct 2023 844th Glinte 859 72 23ms 11 Dec 2023 844th nanatsu8 859 72 25ms 11 May 2024 844th thej10n 859 72 20ms 12 Jun 2024 844th duckyluuk 🇳🇱 859 72 19ms 13 Jun 2024 844th tobeannouncd 859 72 16ms 25 Apr 2025 844th YAJUE114514 859 72 17ms 15 Aug 2025 844th blaztoma 🇱🇹 859 72 23ms 26 Sep 2025 863rd Liibe 859 97 334ms 25 Sep 2025 864th Yewzir 🇧🇪 858 65 4ms 9 Oct 2023 864th MeWhenI 🇻🇦 858 65 3ms 10 Oct 2023 866th Shanethegamer 🇺🇸 858 83 1,291ms 4 May 2022 867th frankgraziano 858 198 102ms 14 Oct 2025 868th dokutan 857 93 428ms 27 Sep 2025 869th henrydukepickle 857 97 128ms 8 Jul 2025 870th yeminghan2021 857 99 56ms 3 Feb 2025 871st DialFrost 🇸🇬 857 162 1,795ms 13 Sep 2025 871st emgordon154 857 162 1,676ms 17 Sep 2025 873rd JayXon 🇺🇸 856 56 998ms 9 May 2022 874th mtirado1 856 74 73ms 24 Dec 2022 874th Betuaredead 856 74 77ms 6 Jan 2023 874th KatieLG 🇬🇧 856 74 79ms 15 Jan 2023 874th bwat2 856 74 80ms 31 Mar 2023 874th stackotter 856 74 77ms 29 May 2023 874th ovs-code 🇩🇪 856 74 79ms 17 Apr 2024 874th madeforlosers 856 74 76ms 21 Nov 2024 881st frosster 856 76 7ms 12 May 2023 881st kyleclaassen 856 76 11ms 20 May 2023 881st NickTheEASDude 🇺🇸 856 76 6ms 7 May 2024 881st koipondx86 856 76 8ms 8 Nov 2024 885th eshilo-draper 856 91 348ms 4 Sep 2022 885th ericlangedijk 🇸🇮 856 91 387ms 23 May 2023 885th KatieLG 🇬🇧 856 91 356ms 30 Apr 2024 885th Mikey-Beep 🇬🇧 856 91 345ms 3 Sep 2024 889th SirBogman 🇺🇸 855 55 43ms 5 May 2022 889th olivermrose 🇺🇸 855 55 45ms 6 May 2022 889th 4hg 🇺🇸 855 55 46ms 24 Aug 2022 889th DialFrost 🇸🇬 855 55 50ms 1 Jan 2023 889th error256 855 55 43ms 4 May 2024 894th DialFrost 🇸🇬 855 61 505ms 21 Jan 2024 895th Shanethegamer 🇺🇸 855 99 27ms 27 Apr 2023 896th ovs-code 🇩🇪 853 62 132ms 3 Aug 2024 896th MeWhenI 🇻🇦 853 62 139ms 25 Oct 2024 896th Shanethegamer 🇺🇸 853 62 135ms 19 Dec 2024 899th Grrisly 853 114 264ms 25 Mar 2024 900th JRaspass 🇬🇧 852 46 344ms 4 May 2022 First Prev 826–900 of 3,470 Next Last