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 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 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 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 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 Tower of Hanoi Turtle Tutorial # Golfer Points Bytes Time Submitted 526th NotEvenIndian 642 124 10ms 22 Oct 2024 526th ridingqwerty 🇺🇸 642 124 16ms 16 Jan 2025 526th CommandLeo 🇮🇹 642 124 10ms 5 Oct 2025 529th tomh1012 641 111 396ms 8 Sep 2025 530th stefangimmillaro 639 73 234ms 1 Oct 2024 531st Jonatan6 🇩🇰 639 110 2ms 24 Oct 2024 531st solisolu 639 110 2ms 2 days ago 533rd elgan65536 639 146 156ms 2 Oct 2024 533rd dokutan 639 146 328ms 4 days ago 533rd luuumine 🇫🇷 639 146 148ms 42 hours ago 536th MeWhenI 🇻🇦 638 73 8ms 3 Oct 2024 537th bnic24 637 125 17ms 3 Oct 2024 537th adoxography 637 125 10ms 22 Oct 2024 537th wh3n3v3r 🇨🇿 637 125 10ms 18 Nov 2024 537th lelbal 637 125 10ms 14 Oct 2025 541st msbranicky 633 188 250ms 7 Jan 2025 542nd Shanethegamer 🇺🇸 631 74 230ms 16 Oct 2024 543rd XenThe 🇬🇧 631 102 9ms 7 Jul 2025 544th albanian-laundromat 631 264 541ms 25 days ago 545th CatsAreFluffy 627 127 16ms 30 Oct 2024 545th WillowWispy 627 127 9ms 25 May 2025 547th DialFrost 🇸🇬 627 304 152ms 13 Aug 2025 548th AlephSquirrel 625 40 48ms 1 Oct 2024 549th dokutan 624 127 2ms 10 Dec 2024 550th not-a-pokemon 622 113 2ms 23 Jul 2025 551st Lv0Sys 🇵🇱 622 128 18ms 15 Jun 2025 552nd codereport 🇨🇦 619 63 34ms 2 Oct 2024 553rd BalaM314 619 104 8ms 4 Feb 2025 553rd acollett89 619 104 9ms 15 Jul 2025 555th HumanoidCPU 619 107 490ms 17 Feb 2025 555th snoozingnewt 🇺🇸 619 107 446ms 7 days ago 557th MarcMush 🇫🇷 617 91 737ms 8 Oct 2024 558th jupj 🇫🇮 617 114 2ms 20 Jul 2025 559th madex 🇩🇪 617 129 16ms 2 Oct 2024 559th RedzGoose 🇦🇺 617 129 10ms 15 Oct 2024 559th calebaitken 617 129 9ms 11 Apr 2025 559th rollershutter 617 129 16ms 7 days ago 563rd Ripick 617 135 335ms 23 Mar 2025 564th Europe2048 613 130 10ms 2 Oct 2024 564th nstearns96 🇬🇧 613 130 16ms 2 Oct 2024 564th Stockoh 🇫🇷 613 130 16ms 4 Jul 2025 564th luuumine 🇫🇷 613 130 17ms 8 Oct 2025 568th evnu 612 147 77ms 12 Oct 2025 569th Seanharrs 609 117 411ms 15 Nov 2024 570th kaascevich 609 134 114ms 9 Jul 2025 571st bac0id 609 141 373ms 10 Jan 2025 572nd inverseLorentz 🇦🇺 608 131 9ms 7 Oct 2024 572nd dokutan 608 131 10ms 19 Oct 2024 572nd sciencejiho 608 131 16ms 11 Feb 2025 572nd Jaydosu 608 131 9ms 11 Apr 2025 572nd Emutis 🇱🇹 608 131 10ms 16 days ago 577th HumanoidCPU 607 106 10ms 7 Mar 2025 577th daveberlin 607 106 9ms 27 Jun 2025 579th MeWhenI 🇻🇦 607 111 79ms 2 Oct 2024 580th Shanethegamer 🇺🇸 606 154 145ms 3 Oct 2024 581st emgordon154 606 156 8ms 13 Dec 2024 582nd MeWhenI 🇻🇦 605 73 2ms 2 Oct 2024 583rd albanian-laundromat 605 315 13ms 3 days ago 584th alemelis 604 93 467ms 1 Oct 2024 585th roguh 🇬🇹 601 117 2ms 13 Oct 2024 585th iczelia 🇩🇪 601 117 3ms 25 Sep 2025 587th Mabeloid 🇳🇴 599 133 10ms 2 Oct 2024 588th MeWhenI 🇻🇦 597 98 7ms 1 Oct 2024 589th dokutan 596 116 2ms 8 days ago 590th dokutan 595 159 7ms 19 Oct 2024 591st arcpolaris 593 120 347ms 28 Jan 2025 592nd SirBogman 🇺🇸 591 64 122ms 11 Jul 2025 593rd bac0id 591 119 2ms 10 Jan 2025 594th tatzyr 🇯🇵 590 81 36ms 23 Dec 2024 595th RaBa21 🇭🇺 590 135 18ms 19 Jul 2025 596th DialFrost 🇸🇬 586 67 9ms 25 Jan 2025 597th sciencedjinn 586 136 9ms 8 Nov 2024 597th ihatethefrench 586 136 17ms 4 Jan 2025 599th h3ra993huskp 🇯🇵 586 159 295ms 25 Nov 2024 599th Schmitt-Very-Cool 586 159 339ms 26 Sep 2025 First Prev 526–600 of 831 Next Last