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 Continued Fractions 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 Continued Fractions 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 821st ollyspooner 863 62 10ms 22 Nov 2023 821st itserasmus 863 62 14ms 25 Jan 2024 821st Jacob385 863 62 11ms 13 Mar 2024 821st junkondo-jp 863 62 10ms 30 Jun 2024 821st ShiraJoseph 🇺🇸 863 62 10ms 1 Mar 2025 831st MeWhenI 🇻🇦 863 145 452ms 28 Mar 2025 832nd HPWiz 🇳🇿 862 50 241ms 4 May 2022 832nd JayXon 🇺🇸 862 50 252ms 5 May 2022 832nd Steffan153 🇫🇮 862 50 278ms 10 Dec 2022 832nd ovs-code 🇩🇪 862 50 389ms 24 Oct 2023 832nd sean-niemann 🇺🇸 862 50 254ms 12 Jul 2024 837th typeswitch-dev 🇵🇹 862 75 5ms 22 Jul 2023 838th ovs-code 🇩🇪 862 161 1,597ms 14 Sep 2025 838th Yewzir 🇧🇪 862 161 1,672ms 9 days ago 840th Shanethegamer 🇺🇸 861 58 790ms 17 Sep 2025 841st NewDefectus 🇮🇱 861 73 3ms 6 May 2022 841st Natanaelel 🇸🇪 861 73 2ms 15 Jun 2022 841st LorenzoDeGaspari 861 73 3ms 27 May 2024 841st Bpc-CPU 861 73 2ms 12 Jul 2025 841st AZTECCO 861 73 3ms 16 Sep 2025 841st CaedenHarper 🇨🇦 861 73 3ms 28 Sep 2025 847th 386asm 🇺🇸 861 86 45ms 9 Apr 2023 848th o0lit3 🇺🇸 859 54 8ms 22 Jun 2023 848th Natanaelel 🇸🇪 859 54 8ms 10 Feb 2025 850th scpchicken 🇵🇼 859 72 20ms 4 May 2022 850th sultan 859 72 16ms 6 Jun 2022 850th annaproxy 859 72 21ms 22 Aug 2022 850th BlankSpruce 859 72 27ms 9 Sep 2022 850th ValentinCassayre 859 72 20ms 8 Oct 2022 850th mathb0y512 859 72 21ms 1 Dec 2022 850th NoahBolohan 🇨🇦 859 72 23ms 28 Feb 2023 850th neel11235813 859 72 19ms 8 Mar 2023 850th Kacarott 🇦🇺 859 72 15ms 24 Mar 2023 850th Fracture17 859 72 20ms 8 Apr 2023 850th ayushdewan 859 72 24ms 7 May 2023 850th PeterTillema 🇳🇱 859 72 24ms 17 Oct 2023 850th Glinte 859 72 23ms 11 Dec 2023 850th nanatsu8 859 72 25ms 11 May 2024 850th thej10n 859 72 20ms 12 Jun 2024 850th duckyluuk 🇳🇱 859 72 19ms 13 Jun 2024 850th tobeannouncd 859 72 16ms 25 Apr 2025 850th YAJUE114514 859 72 17ms 15 Aug 2025 850th blaztoma 🇱🇹 859 72 23ms 26 Sep 2025 869th aditsu 859 77 2,042ms 2 hours ago 870th Liibe 859 97 334ms 25 Sep 2025 871st Yewzir 🇧🇪 858 65 4ms 9 Oct 2023 871st MeWhenI 🇻🇦 858 65 3ms 10 Oct 2023 873rd Shanethegamer 🇺🇸 858 83 1,291ms 4 May 2022 874th frankgraziano 858 198 101ms 14 Oct 2025 875th dokutan 857 93 428ms 27 Sep 2025 876th henrydukepickle 857 97 128ms 8 Jul 2025 877th yeminghan2021 857 99 54ms 3 Feb 2025 878th DialFrost 🇸🇬 857 162 1,719ms 13 Sep 2025 878th emgordon154 857 162 1,676ms 17 Sep 2025 880th JayXon 🇺🇸 856 56 998ms 9 May 2022 881st mtirado1 856 74 73ms 24 Dec 2022 881st Betuaredead 856 74 77ms 6 Jan 2023 881st KatieLG 🇬🇧 856 74 79ms 15 Jan 2023 881st bwat2 856 74 80ms 31 Mar 2023 881st stackotter 856 74 77ms 29 May 2023 881st ovs-code 🇩🇪 856 74 77ms 17 Apr 2024 881st madeforlosers 856 74 76ms 21 Nov 2024 888th frosster 856 76 7ms 12 May 2023 888th kyleclaassen 856 76 11ms 20 May 2023 888th NickTheEASDude 🇺🇸 856 76 6ms 7 May 2024 888th koipondx86 856 76 8ms 8 Nov 2024 892nd eshilo-draper 856 91 317ms 4 Sep 2022 892nd ericlangedijk 🇸🇮 856 91 330ms 23 May 2023 892nd KatieLG 🇬🇧 856 91 333ms 30 Apr 2024 892nd Mikey-Beep 🇬🇧 856 91 316ms 3 Sep 2024 896th SirBogman 🇺🇸 855 55 43ms 5 May 2022 896th olivermrose 🇺🇸 855 55 45ms 6 May 2022 896th 4hg 🇺🇸 855 55 46ms 24 Aug 2022 896th DialFrost 🇸🇬 855 55 50ms 1 Jan 2023 896th error256 855 55 43ms 4 May 2024 First Prev 826–900 of 3,484 Next Last