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 373rd Natanaelel 🇸🇪 922 51 39ms 2 Jun 2022 377th uiamn 922 58 11ms 6 Sep 2022 377th 5quiwyrm 922 58 11ms 29 Sep 2022 377th alasdair-greenland 922 58 10ms 13 Jan 2023 377th kirjavascript 922 58 11ms 4 Aug 2025 377th Posandu 922 58 13ms 26 Aug 2025 377th mrxz 🇳🇱 922 58 10ms 3 Sep 2025 383rd MichalMarsalek 🇨🇿 922 71 122ms 5 May 2022 383rd Lydxn 🇨🇦 922 71 126ms 7 May 2022 383rd GrayJoKing 🇦🇺 922 71 129ms 8 May 2022 383rd JayXon 🇺🇸 922 71 137ms 8 May 2022 383rd Steffan153 🇫🇮 922 71 120ms 9 Mar 2023 383rd Shanethegamer 🇺🇸 922 71 128ms 15 May 2023 383rd MeWhenI 🇻🇦 922 71 121ms 8 Aug 2023 383rd sean-niemann 🇺🇸 922 71 126ms 9 Jan 2025 391st Steffan153 🇫🇮 922 76 12ms 15 May 2023 391st primo-ppcg 🇹🇭 922 76 23ms 15 May 2023 391st Lydxn 🇨🇦 922 76 8ms 22 May 2023 391st GrayJoKing 🇦🇺 922 76 12ms 24 Aug 2023 395th Herbert00709 🇵🇱 922 92 55ms 17 Nov 2023 395th 4QT0R 922 92 62ms 23 Nov 2023 395th ovs-code 🇩🇪 922 92 56ms 3 Jun 2024 398th xnor-gate 919 63 194ms 20 Jan 2025 399th Lydxn 🇨🇦 918 70 96ms 7 May 2022 399th JayXon 🇺🇸 918 70 96ms 7 May 2022 401st pardouin 🇫🇷 918 72 3,105ms 21 May 2025 402nd primo-ppcg 🇹🇭 917 61 6ms 6 May 2022 402nd sisyphus-ppcg 🇦🇺 917 61 9ms 14 Jul 2022 404th Steffan153 🇫🇮 917 71 107ms 14 Oct 2022 404th Shanethegamer 🇺🇸 917 71 106ms 15 Oct 2022 404th stefangimmillaro 917 71 106ms 16 Oct 2022 404th MeWhenI 🇻🇦 917 71 105ms 16 Oct 2022 404th Steffan153 🇫🇮 917 71 6ms 10 Dec 2022 404th synt7x 🇺🇸 917 71 4ms 7 Jul 2025 410th annaproxy 917 79 128ms 24 Aug 2022 410th GrayJoKing 🇦🇺 917 79 89ms 28 Aug 2022 410th JayXon 🇺🇸 917 79 869ms 5 Apr 2023 410th Lydxn 🇨🇦 917 79 858ms 9 Apr 2023 410th IanUtley 917 79 119ms 3 Nov 2023 410th Kacarott 🇦🇺 917 79 135ms 13 Jun 2024 416th Steffan153 🇫🇮 917 81 26ms 11 Dec 2023 417th arctouch-cristiannevianna 916 85 366ms 3 Apr 2023 417th tomtheisen 🇺🇸 916 85 340ms 10 Apr 2025 419th Shanethegamer 🇺🇸 916 87 390ms 15 May 2023 419th JayXon 🇺🇸 916 87 508ms 15 May 2023 419th Steffan153 🇫🇮 916 87 389ms 16 May 2023 419th Lydxn 🇨🇦 916 87 465ms 16 May 2023 419th GrayJoKing 🇦🇺 916 87 400ms 11 Aug 2023 419th sean-niemann 🇺🇸 916 87 458ms 11 Jul 2024 425th Natanaelel 🇸🇪 915 57 474ms 17 Jan 2024 425th Kacarott 🇦🇺 915 57 425ms 10 Sep 2024 427th Shanethegamer 🇺🇸 915 61 4ms 9 Oct 2023 427th edsrzf 🇳🇿 915 61 4ms 4 Jul 2025 429th ovs-code 🇩🇪 915 75 74ms 12 Sep 2024 429th Kacarott 🇦🇺 915 75 78ms 13 Sep 2024 431st Lydxn 🇨🇦 914 81 45ms 1 Apr 2023 432nd lynn 913 78 1,358ms 5 May 2022 433rd andersk 🇺🇸 913 91 120ms 25 Oct 2022 433rd Super-Pizza 🇨🇦 913 91 127ms 4 Dec 2022 433rd klixel 🇨🇦 913 91 121ms 20 May 2023 433rd lynn 913 91 140ms 6 Jul 2024 433rd edsrzf 🇳🇿 913 91 124ms 29 Nov 2024 433rd DialFrost 🇸🇬 913 91 123ms 7 Apr 2025 439th TFeld00 🇩🇰 912 71 23ms 17 May 2022 439th DialFrost 🇸🇬 912 71 25ms 15 Nov 2022 439th StefanHabel 🇨🇦 912 71 17ms 29 Nov 2022 439th nstearns96 🇬🇧 912 71 18ms 11 Jan 2023 439th hallvabo 🇳🇴 912 71 19ms 7 Feb 2023 439th anter69 🇭🇺 912 71 17ms 21 May 2024 439th rucin93 🇵🇱 912 71 17ms 10 Jul 2024 439th lelbal 912 71 20ms 26 Aug 2025 439th HETHAT 🇩🇿 912 71 24ms 23 Sep 2025 448th tailorspy 912 93 53ms 27 May 2024 448th sean-niemann 🇺🇸 912 93 54ms 9 Jun 2025 448th KasperKivimaeki 🇫🇮 912 93 54ms 20 days ago First Prev 376–450 of 3,464 Next Last