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 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 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 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 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 523rd lelbal 637 125 10ms 20 days ago 523rd snoozingnewt 🇺🇸 637 125 10ms 21 hours ago 528th msbranicky 633 188 276ms 7 Jan 2025 529th Shanethegamer 🇺🇸 631 74 223ms 16 Oct 2024 530th XenThe 🇬🇧 631 102 8ms 7 Jul 2025 531st albanian-laundromat 631 264 843ms 13 hours ago 532nd CatsAreFluffy 627 127 18ms 30 Oct 2024 532nd WillowWispy 627 127 11ms 25 May 2025 534th DialFrost 🇸🇬 627 304 159ms 13 Aug 2025 535th AlephSquirrel 625 40 48ms 1 Oct 2024 536th dokutan 623 127 2ms 10 Dec 2024 537th Lv0Sys 🇵🇱 622 128 19ms 15 Jun 2025 538th not-a-pokemon 620 113 2ms 23 Jul 2025 539th BalaM314 619 104 10ms 4 Feb 2025 539th acollett89 619 104 9ms 15 Jul 2025 541st HumanoidCPU 618 107 490ms 17 Feb 2025 542nd codereport 🇨🇦 617 63 34ms 2 Oct 2024 543rd MarcMush 🇫🇷 617 91 746ms 8 Oct 2024 544th madex 🇩🇪 617 129 18ms 2 Oct 2024 544th RedzGoose 🇦🇺 617 129 11ms 15 Oct 2024 544th calebaitken 617 129 10ms 11 Apr 2025 547th Ripick 617 135 355ms 23 Mar 2025 548th jupj 🇫🇮 615 114 2ms 20 Jul 2025 549th Europe2048 612 130 11ms 2 Oct 2024 549th nstearns96 🇬🇧 612 130 16ms 2 Oct 2024 549th rollershutter 612 130 11ms 10 Jan 2025 549th Stockoh 🇫🇷 612 130 18ms 4 Jul 2025 549th luuumine 🇫🇷 612 130 17ms 26 days ago 554th Seanharrs 609 117 405ms 15 Nov 2024 555th bac0id 609 141 433ms 10 Jan 2025 556th evnu 609 147 313ms 21 days ago 557th inverseLorentz 🇦🇺 608 131 11ms 7 Oct 2024 557th dokutan 608 131 10ms 19 Oct 2024 557th sciencejiho 608 131 19ms 11 Feb 2025 557th Jaydosu 608 131 10ms 11 Apr 2025 561st HumanoidCPU 607 106 12ms 7 Mar 2025 561st daveberlin 607 106 10ms 27 Jun 2025 563rd MeWhenI 🇻🇦 607 111 79ms 2 Oct 2024 564th kaascevich 607 134 155ms 9 Jul 2025 565th emgordon154 606 156 10ms 13 Dec 2024 566th MeWhenI 🇻🇦 605 73 2ms 2 Oct 2024 567th alemelis 604 93 485ms 1 Oct 2024 568th Shanethegamer 🇺🇸 604 154 142ms 3 Oct 2024 569th roguh 🇬🇹 599 117 2ms 13 Oct 2024 569th iczelia 🇩🇪 599 117 3ms 25 Sep 2025 571st Mabeloid 🇳🇴 599 133 11ms 2 Oct 2024 571st Emutis 🇱🇹 599 133 11ms 4 Feb 2025 573rd dokutan 598 117 2ms 3 Oct 2024 574th MeWhenI 🇻🇦 597 98 7ms 1 Oct 2024 575th dokutan 595 159 7ms 19 Oct 2024 576th arcpolaris 593 120 358ms 28 Jan 2025 577th SirBogman 🇺🇸 591 64 133ms 11 Jul 2025 578th tatzyr 🇯🇵 590 81 36ms 23 Dec 2024 579th Babafaba 590 112 651ms 18 days ago 580th RaBa21 🇭🇺 590 135 17ms 19 Jul 2025 581st bac0id 589 119 2ms 10 Jan 2025 582nd DialFrost 🇸🇬 586 67 9ms 25 Jan 2025 583rd gigaprofisi 🇺🇸 585 110 10ms 11 Aug 2025 584th sciencedjinn 585 136 10ms 8 Nov 2024 584th ihatethefrench 585 136 18ms 4 Jan 2025 586th h3ra993huskp 🇯🇵 584 159 336ms 25 Nov 2024 586th Schmitt-Very-Cool 584 159 370ms 26 Sep 2025 588th dokutan 584 174 5ms 21 Feb 2025 589th olleicua 🇺🇸 582 82 33ms 18 Oct 2024 590th Trip-kun 582 136 2ms 5 Oct 2024 591st kurkale6ka 581 137 22ms 16 Oct 2024 591st 4ndyJ 🇬🇧 581 137 11ms 14 Nov 2024 591st Mikey-Beep 🇬🇧 581 137 16ms 6 Aug 2025 591st wobblybits 581 137 21ms 17 Aug 2025 595th Mabeloid 🇳🇴 579 121 2ms 13 days ago 596th michelebastione 🇮🇹 579 123 402ms 26 Aug 2025 597th MeWhenI 🇻🇦 576 331 18ms 2 Oct 2024 598th albanian-laundromat 574 77 2ms 13 hours ago 599th KatieLG 🇬🇧 574 99 1,081ms 1 Oct 2024 600th 823126 574 112 10ms 13 Nov 2024 First Prev 526–600 of 808 Next Last