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 826th Natanaelel 🇸🇪 845 57 17 Jan 2024 826th Kacarott 🇦🇺 845 57 10 Sep 2024 826th albanian-laundromat 845 57 8 days ago 829th NewDefectus 🇮🇱 845 73 6 May 2022 829th inventshah 845 73 12 Jun 2022 829th Natanaelel 🇸🇪 845 73 15 Jun 2022 829th Herbert00709 🇵🇱 845 73 22 Dec 2023 829th LorenzoDeGaspari 845 73 27 May 2024 829th Bpc-CPU 845 73 12 Jul 2025 829th AZTECCO 845 73 16 Sep 2025 829th CaedenHarper 🇨🇦 845 73 17 days ago 837th lynn 845 96 11 Jul 2023 838th Shanethegamer 🇺🇸 845 98 26 Oct 2022 838th emgordon154 845 98 18 Feb 2025 840th jared-hughes 845 100 20 Jul 2022 840th ZakkkkAttackkkk 🇵🇭 845 100 10 Aug 2022 840th Walter225 845 100 25 Jul 2023 843rd retrohun 844 64 6 Nov 2022 843rd Re-Adventures 🇮🇳 844 64 7 Nov 2022 843rd stellartux 844 64 26 Dec 2023 843rd bac0id 844 64 29 Jun 2024 843rd snoozingnewt 🇺🇸 844 64 1 Sep 2024 843rd albanian-laundromat 844 64 23 days ago 849th janAkali 🇷🇺 843 77 12 Feb 2025 850th bschorno 843 92 12 Oct 2022 850th ChrisTheisen 843 92 14 Dec 2022 850th kellantech 843 92 4 Jul 2023 850th Mezzofloat 843 92 26 Aug 2023 850th Maximizer02 843 92 1 Oct 2023 850th madeforlosers 843 92 21 Nov 2024 850th ChromaChroma 843 92 7 days ago 850th snoozingnewt 🇺🇸 843 92 7 days ago 858th DialFrost 🇸🇬 842 66 7 Apr 2025 859th SirBogman 🇺🇸 842 89 4 May 2022 860th dokutan 842 93 18 days ago 861st KatieLG 🇬🇧 842 115 25 Sep 2022 861st emgordon154 842 115 17 Jan 2025 863rd ovs-code 🇩🇪 842 161 14 Sep 2025 864th krcs 🇵🇱 841 53 9 May 2022 864th ryanlanegit 841 53 19 Jun 2022 864th sisyphus-ppcg 🇦🇺 841 53 15 Aug 2022 867th raszpi 🇭🇺 840 77 1 Sep 2023 868th error256 840 81 13 Sep 2024 869th eshilo-draper 839 75 6 Sep 2022 869th kmathis22 839 75 5 Sep 2025 871st sean-niemann 🇺🇸 839 76 8 Oct 2024 872nd frankgraziano 838 66 20 Apr 2025 873rd emplv 🇱🇻 838 124 31 Oct 2022 874th Codsilla 🇨🇦 837 51 1 Jul 2022 875th Andriamanitra 🇫🇮 837 83 17 Apr 2023 875th Natanaelel 🇸🇪 837 83 8 Jul 2023 877th Steffan153 🇫🇮 837 97 18 Jan 2023 878th CatsAreFluffy 837 101 18 Feb 2023 878th annaproxy 837 101 9 May 2023 878th wojtekmal 837 101 15 Nov 2023 878th HumanoidCPU 837 101 6 May 2024 878th eMGeeneer 837 101 27 Jun 2024 878th bac0id 837 101 29 Jun 2024 878th michaelmoynihan 837 101 3 Sep 2025 878th snoozingnewt 🇺🇸 837 101 9 days ago 886th DialFrost 🇸🇬 837 162 13 Sep 2025 886th emgordon154 837 162 17 Sep 2025 888th ovs-code 🇩🇪 836 85 11 Dec 2023 889th dokutan 836 88 9 Jun 2024 890th CLOStrophobic 🇮🇹 836 89 14 Feb 2025 891st scpchicken 🇵🇼 835 55 4 May 2022 891st SirBogman 🇺🇸 835 55 5 May 2022 891st Shanethegamer 🇺🇸 835 55 19 May 2023 891st DialFrost 🇸🇬 835 55 14 Feb 2025 895th Yewzir 🇧🇪 835 69 24 Dec 2024 896th Re-Adventures 🇮🇳 835 116 16 Jul 2023 896th Yewzir 🇧🇪 835 116 7 Feb 2024 898th SirBogman 🇺🇸 834 36 5 May 2022 898th HPWiz 🇳🇿 834 36 7 May 2022 898th Natanaelel 🇸🇪 834 36 15 Jun 2022 First Prev 826–900 of 3,374 Next Last