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 526th CaedenHarper 🇨🇦 643 100 9ms 22 Aug 2025 526th iczelia 🇩🇪 643 100 9ms 11 Oct 2025 526th Yax42 🇫🇷 643 100 18ms 6 days ago 529th Apataras 643 145 302ms 25 Jun 2025 530th NotEvenIndian 642 124 10ms 22 Oct 2024 530th ridingqwerty 🇺🇸 642 124 16ms 16 Jan 2025 530th CommandLeo 🇮🇹 642 124 10ms 5 Oct 2025 533rd tomh1012 641 111 396ms 8 Sep 2025 534th stefangimmillaro 639 73 234ms 1 Oct 2024 535th Jonatan6 🇩🇰 639 110 2ms 24 Oct 2024 535th solisolu 639 110 2ms 7 days ago 537th elgan65536 639 146 154ms 2 Oct 2024 537th dokutan 639 146 328ms 9 days ago 537th luuumine 🇫🇷 639 146 148ms 7 days ago 540th MeWhenI 🇻🇦 638 73 8ms 3 Oct 2024 541st bnic24 637 125 16ms 3 Oct 2024 541st adoxography 637 125 10ms 22 Oct 2024 541st wh3n3v3r 🇨🇿 637 125 10ms 18 Nov 2024 541st lelbal 637 125 10ms 14 Oct 2025 545th msbranicky 634 188 267ms 7 Jan 2025 546th Shanethegamer 🇺🇸 631 74 230ms 16 Oct 2024 547th XenThe 🇬🇧 631 102 9ms 7 Jul 2025 548th albanian-laundromat 631 264 444ms 3 Nov 2025 549th CatsAreFluffy 627 127 17ms 30 Oct 2024 549th WillowWispy 627 127 10ms 25 May 2025 551st DialFrost 🇸🇬 627 304 152ms 13 Aug 2025 552nd AlephSquirrel 625 40 48ms 1 Oct 2024 553rd dokutan 624 127 2ms 10 Dec 2024 554th not-a-pokemon 622 113 2ms 23 Jul 2025 555th Lv0Sys 🇵🇱 622 128 16ms 15 Jun 2025 556th codereport 🇨🇦 619 63 34ms 2 Oct 2024 557th BalaM314 619 104 8ms 4 Feb 2025 557th acollett89 619 104 9ms 15 Jul 2025 559th HumanoidCPU 619 107 463ms 17 Feb 2025 559th snoozingnewt 🇺🇸 619 107 515ms 13 days ago 561st MarcMush 🇫🇷 617 91 737ms 8 Oct 2024 562nd jupj 🇫🇮 617 114 2ms 20 Jul 2025 563rd madex 🇩🇪 617 129 16ms 2 Oct 2024 563rd RedzGoose 🇦🇺 617 129 10ms 15 Oct 2024 563rd calebaitken 617 129 9ms 11 Apr 2025 563rd rollershutter 617 129 17ms 13 days ago 563rd JOrE20 🇺🇸 617 129 21ms 47 hours ago 568th Ripick 617 135 335ms 23 Mar 2025 569th Europe2048 613 130 9ms 2 Oct 2024 569th nstearns96 🇬🇧 613 130 15ms 2 Oct 2024 569th Stockoh 🇫🇷 613 130 15ms 4 Jul 2025 572nd evnu 612 147 78ms 12 Oct 2025 573rd Seanharrs 609 117 411ms 15 Nov 2024 574th kaascevich 609 134 114ms 9 Jul 2025 575th bac0id 609 141 373ms 10 Jan 2025 576th inverseLorentz 🇦🇺 608 131 10ms 7 Oct 2024 576th dokutan 608 131 10ms 19 Oct 2024 576th sciencejiho 608 131 17ms 11 Feb 2025 576th Jaydosu 608 131 10ms 11 Apr 2025 576th Emutis 🇱🇹 608 131 10ms 21 days ago 581st HumanoidCPU 607 106 10ms 7 Mar 2025 581st daveberlin 607 106 9ms 27 Jun 2025 583rd MeWhenI 🇻🇦 607 111 79ms 2 Oct 2024 584th Shanethegamer 🇺🇸 606 154 145ms 3 Oct 2024 585th emgordon154 606 156 8ms 13 Dec 2024 586th MeWhenI 🇻🇦 605 73 2ms 2 Oct 2024 587th albanian-laundromat 605 315 13ms 8 days ago 588th alemelis 604 93 467ms 1 Oct 2024 589th roguh 🇬🇹 601 117 2ms 13 Oct 2024 589th iczelia 🇩🇪 601 117 3ms 25 Sep 2025 591st Mabeloid 🇳🇴 599 133 10ms 2 Oct 2024 592nd MeWhenI 🇻🇦 597 98 7ms 1 Oct 2024 593rd dokutan 596 116 2ms 13 days ago 594th dokutan 595 159 7ms 19 Oct 2024 595th arcpolaris 593 120 347ms 28 Jan 2025 596th SirBogman 🇺🇸 591 64 122ms 11 Jul 2025 597th bac0id 591 119 2ms 10 Jan 2025 598th tatzyr 🇯🇵 590 81 36ms 23 Dec 2024 599th RaBa21 🇭🇺 590 135 15ms 19 Jul 2025 600th DialFrost 🇸🇬 586 67 9ms 25 Jan 2025 First Prev 526–600 of 835 Next Last