Card Number Validation in all languages in bytes. Achievements Cheevos Holes Languages Medals Miscellaneous 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 Tower of Hanoi 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 Taxicab Numbers Turtle Tutorial All Languages ><> Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang 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 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 Erlang 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 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 Tower of Hanoi 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 Taxicab Numbers Turtle Tutorial # Golfer Points Bytes Time Submitted 601st sciencedjinn 586 136 9ms 8 Nov 2024 601st ihatethefrench 586 136 17ms 4 Jan 2025 603rd Schmitt-Very-Cool 586 159 339ms 26 Sep 2025 604th gigaprofisi 🇺🇸 585 110 9ms 11 Aug 2025 605th dokutan 584 174 5ms 21 Feb 2025 606th Trip-kun 583 136 2ms 5 Oct 2024 607th olleicua 🇺🇸 582 82 33ms 18 Oct 2024 608th Mabeloid 🇳🇴 581 121 2ms 21 Oct 2025 609th kurkale6ka 581 137 21ms 16 Oct 2024 609th 4ndyJ 🇬🇧 581 137 10ms 14 Nov 2024 609th Mikey-Beep 🇬🇧 581 137 16ms 6 Aug 2025 609th wobblybits 581 137 15ms 17 Aug 2025 613th michelebastione 🇮🇹 579 123 375ms 26 Aug 2025 614th MeWhenI 🇻🇦 576 331 15ms 2 Oct 2024 615th 823126 575 112 8ms 13 Nov 2024 615th dokutan 575 112 8ms 22 Jun 2025 615th snoozingnewt 🇺🇸 575 112 8ms 2 Nov 2025 618th albanian-laundromat 574 77 2ms 3 Nov 2025 619th KatieLG 🇬🇧 574 99 1,081ms 1 Oct 2024 620th scpchicken 🇵🇼 573 139 16ms 6 Oct 2024 621st NanduBC 569 140 10ms 1 Oct 2024 621st jmerle 🇳🇱 569 140 10ms 10 Jan 2025 621st RobertHoeh 569 140 12ms 3 Mar 2025 621st smilesformiles3 569 140 20ms 12 Jun 2025 621st artem-aramma 569 140 23ms 18 Jun 2025 621st Andrey2001 569 140 13ms 5 days ago 627th MeWhenI 🇻🇦 569 164 209ms 6 Oct 2024 628th CaedenHarper 🇨🇦 565 104 731ms 9 days ago 629th FranklinJiaChen 565 141 9ms 2 Oct 2024 630th KatieLG 🇬🇧 562 85 36ms 12 Jan 2025 631st aliakseikalosha 561 127 401ms 10 Oct 2024 632nd brimstonetrader 561 142 9ms 17 Oct 2024 632nd codewrite 🇬🇧 561 142 10ms 5 May 2025 632nd RobGLambert 561 142 16ms 8 Jun 2025 632nd GodlyProgrammer1 561 142 27ms 10 days ago 636th FortuiteMan 🇫🇷 559 272 37ms 10 days ago 637th GeneralFabian 557 143 10ms 9 Dec 2024 637th CutSandstone 557 143 10ms 30 Jan 2025 637th kistlerf 🇨🇭 557 143 17ms 19 May 2025 640th madex 🇩🇪 555 116 8ms 1 Oct 2024 641st MeWhenI 🇻🇦 554 290 9ms 2 Oct 2024 642nd hiichbindermax 553 144 16ms 2 Oct 2024 642nd mathisfun271 553 144 14ms 14 Oct 2024 642nd bob-th 553 144 9ms 22 Oct 2024 645th JDiLenarda 🇫🇷 553 165 1,278ms 1 Oct 2024 646th KatieLG 🇬🇧 552 120 479ms 1 Oct 2024 647th snoozingnewt 🇺🇸 552 148 114ms 12 days ago 648th edsrzf 🇳🇿 551 135 4ms 27 Feb 2025 649th msbranicky 550 185 4ms 20 Jan 2025 650th mousetail 🇳🇱 549 128 2ms 3 Oct 2024 651st JunkIce 549 145 13ms 3 Dec 2024 651st Flekay 🇩🇪 549 145 10ms 10 Jul 2025 653rd ethanlally 549 170 330ms 14 days ago 654th gpikmddk 548 130 367ms 30 Oct 2025 655th emgordon154 546 52 2ms 3 Nov 2024 656th croc54 546 146 11ms 15 Dec 2024 657th zakariamouhid 545 118 9ms 1 Oct 2024 657th JOrE20 🇺🇸 545 118 9ms 42 hours ago 659th xyangst 545 171 171ms 1 Oct 2024 659th kmathis22 545 171 344ms 13 days ago 661st najs91 544 131 343ms 15 Oct 2024 661st bac0id 544 131 370ms 9 Jan 2025 661st CaedenHarper 🇨🇦 544 131 340ms 17 Oct 2025 664th dokutan 543 122 479ms 19 Oct 2024 665th PyryL 🇫🇮 542 147 10ms 1 Mar 2025 666th eranws 541 119 9ms 23 Dec 2024 667th Sciman101 539 147 2ms 26 Mar 2025 668th mbittner20 538 148 9ms 13 Oct 2024 669th psaban 535 149 16ms 31 Jul 2025 669th TheZwierzLF 🇵🇱 535 149 11ms 8 days ago 671st msbranicky 533 175 162ms 13 Dec 2024 672nd deancureton 532 121 9ms 30 Dec 2024 673rd FlorianCassayre 🇫🇷 531 150 16ms 1 Oct 2024 673rd jameswmccarty 531 150 9ms 5 Oct 2024 673rd yousefalizadeh 531 150 10ms 23 Oct 2024 First Prev 601–675 of 835 Next Last