Card Number Validation 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 526th stefangimmillaro 639 73 234ms 1 Oct 2024 527th MeWhenI 🇻🇦 638 73 8ms 3 Oct 2024 528th Jonatan6 🇩🇰 638 110 2ms 24 Oct 2024 529th elgan65536 638 146 156ms 2 Oct 2024 530th Yax42 🇫🇷 637 101 10ms 5 Sep 2025 531st bnic24 637 125 17ms 3 Oct 2024 531st adoxography 637 125 10ms 22 Oct 2024 531st wh3n3v3r 🇨🇿 637 125 10ms 18 Nov 2024 531st lelbal 637 125 10ms 14 Oct 2025 535th msbranicky 633 188 250ms 7 Jan 2025 536th Shanethegamer 🇺🇸 631 74 230ms 16 Oct 2024 537th XenThe 🇬🇧 631 102 10ms 7 Jul 2025 538th albanian-laundromat 631 264 477ms 17 days ago 539th CatsAreFluffy 627 127 16ms 30 Oct 2024 539th WillowWispy 627 127 9ms 25 May 2025 541st DialFrost 🇸🇬 627 304 152ms 13 Aug 2025 542nd AlephSquirrel 625 40 48ms 1 Oct 2024 543rd dokutan 624 127 2ms 10 Dec 2024 544th Lv0Sys 🇵🇱 622 128 18ms 15 Jun 2025 545th not-a-pokemon 621 113 2ms 23 Jul 2025 546th codereport 🇨🇦 619 63 34ms 2 Oct 2024 547th BalaM314 619 104 8ms 4 Feb 2025 547th acollett89 619 104 9ms 15 Jul 2025 549th HumanoidCPU 618 107 490ms 17 Feb 2025 549th snoozingnewt 🇺🇸 618 107 471ms 7 hours ago 551st MarcMush 🇫🇷 617 91 746ms 8 Oct 2024 552nd madex 🇩🇪 617 129 16ms 2 Oct 2024 552nd RedzGoose 🇦🇺 617 129 10ms 15 Oct 2024 552nd calebaitken 617 129 9ms 11 Apr 2025 552nd rollershutter 617 129 16ms 12 hours ago 556th Ripick 617 135 340ms 23 Mar 2025 557th jupj 🇫🇮 616 114 2ms 20 Jul 2025 558th Europe2048 613 130 10ms 2 Oct 2024 558th nstearns96 🇬🇧 613 130 16ms 2 Oct 2024 558th Stockoh 🇫🇷 613 130 16ms 4 Jul 2025 558th luuumine 🇫🇷 613 130 17ms 8 Oct 2025 562nd evnu 612 147 89ms 12 Oct 2025 563rd Seanharrs 609 117 411ms 15 Nov 2024 564th bac0id 609 141 373ms 10 Jan 2025 565th inverseLorentz 🇦🇺 608 131 9ms 7 Oct 2024 565th dokutan 608 131 10ms 19 Oct 2024 565th sciencejiho 608 131 16ms 11 Feb 2025 565th Jaydosu 608 131 9ms 11 Apr 2025 565th Emutis 🇱🇹 608 131 10ms 9 days ago 570th HumanoidCPU 607 106 14ms 7 Mar 2025 570th daveberlin 607 106 9ms 27 Jun 2025 572nd MeWhenI 🇻🇦 607 111 79ms 2 Oct 2024 573rd kaascevich 607 134 122ms 9 Jul 2025 574th emgordon154 606 156 10ms 13 Dec 2024 575th MeWhenI 🇻🇦 605 73 2ms 2 Oct 2024 576th alemelis 604 93 485ms 1 Oct 2024 577th Shanethegamer 🇺🇸 604 154 145ms 3 Oct 2024 578th roguh 🇬🇹 600 117 2ms 13 Oct 2024 578th iczelia 🇩🇪 600 117 3ms 25 Sep 2025 580th Mabeloid 🇳🇴 599 133 10ms 2 Oct 2024 581st MeWhenI 🇻🇦 597 98 7ms 1 Oct 2024 582nd dokutan 596 116 3ms 30 hours ago 583rd dokutan 595 159 7ms 19 Oct 2024 584th arcpolaris 593 120 347ms 28 Jan 2025 585th SirBogman 🇺🇸 591 64 122ms 11 Jul 2025 586th tatzyr 🇯🇵 590 81 36ms 23 Dec 2024 587th bac0id 590 119 2ms 10 Jan 2025 588th RaBa21 🇭🇺 590 135 18ms 19 Jul 2025 589th DialFrost 🇸🇬 586 67 9ms 25 Jan 2025 590th sciencedjinn 586 136 9ms 8 Nov 2024 590th ihatethefrench 586 136 17ms 4 Jan 2025 592nd h3ra993huskp 🇯🇵 586 159 295ms 25 Nov 2024 592nd Schmitt-Very-Cool 586 159 339ms 26 Sep 2025 594th gigaprofisi 🇺🇸 585 110 10ms 11 Aug 2025 595th dokutan 584 174 5ms 21 Feb 2025 596th Trip-kun 583 136 2ms 5 Oct 2024 597th dokutan 583 160 343ms 3 days ago 598th olleicua 🇺🇸 582 82 33ms 18 Oct 2024 599th kurkale6ka 581 137 21ms 16 Oct 2024 599th 4ndyJ 🇬🇧 581 137 10ms 14 Nov 2024 First Prev 526–600 of 819 Next Last