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 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 Minesweeper NFA Simulator Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers 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 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 Minesweeper NFA Simulator Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Turtle Tutorial # Golfer Points Bytes Time 526th dokutan 622 127 10 Dec 2024 527th lelbal 622 128 2 Oct 2024 527th Lv0Sys 🇵🇱 622 128 15 Jun 2025 529th not-a-pokemon 620 113 23 Jul 2025 530th DialFrost 🇸🇬 619 304 13 Aug 2025 531st BalaM314 618 104 4 Feb 2025 531st acollett89 618 104 15 Jul 2025 533rd codereport 🇨🇦 617 63 2 Oct 2024 534th HumanoidCPU 617 107 17 Feb 2025 535th madex 🇩🇪 617 129 2 Oct 2024 535th RedzGoose 🇦🇺 617 129 15 Oct 2024 535th calebaitken 617 129 11 Apr 2025 538th MarcMush 🇫🇷 615 91 8 Oct 2024 539th jupj 🇫🇮 615 114 20 Jul 2025 540th Ripick 615 135 23 Mar 2025 541st Europe2048 612 130 2 Oct 2024 541st nstearns96 🇬🇧 612 130 2 Oct 2024 541st rollershutter 612 130 10 Jan 2025 541st Stockoh 🇫🇷 612 130 4 Jul 2025 545th bac0id 609 141 10 Jan 2025 546th inverseLorentz 🇦🇺 608 131 7 Oct 2024 546th dokutan 608 131 19 Oct 2024 546th sciencejiho 608 131 11 Feb 2025 546th Jaydosu 608 131 11 Apr 2025 550th HumanoidCPU 607 106 7 Mar 2025 550th daveberlin 607 106 27 Jun 2025 552nd MeWhenI 🇻🇦 607 111 2 Oct 2024 553rd Seanharrs 606 117 15 Nov 2024 554th emgordon154 606 156 13 Dec 2024 555th kaascevich 604 134 9 Jul 2025 556th MeWhenI 🇻🇦 603 73 2 Oct 2024 557th Shanethegamer 🇺🇸 603 154 3 Oct 2024 558th alemelis 602 93 1 Oct 2024 559th roguh 🇬🇹 599 117 13 Oct 2024 559th iczelia 🇩🇪 599 117 11 days ago 561st dokutan 598 117 3 Oct 2024 562nd Mabeloid 🇳🇴 598 133 2 Oct 2024 562nd Emutis 🇱🇹 598 133 4 Feb 2025 564th MeWhenI 🇻🇦 597 98 1 Oct 2024 565th dokutan 595 159 19 Oct 2024 566th SirBogman 🇺🇸 591 64 11 Jul 2025 567th arcpolaris 591 120 28 Jan 2025 568th RaBa21 🇭🇺 590 135 19 Jul 2025 569th tatzyr 🇯🇵 589 81 23 Dec 2024 570th bac0id 589 119 10 Jan 2025 571st DialFrost 🇸🇬 586 67 25 Jan 2025 572nd gigaprofisi 🇺🇸 585 110 11 Aug 2025 573rd sciencedjinn 585 136 8 Nov 2024 573rd ihatethefrench 585 136 4 Jan 2025 575th dokutan 584 174 21 Feb 2025 576th olleicua 🇺🇸 582 82 18 Oct 2024 577th h3ra993huskp 🇯🇵 582 159 25 Nov 2024 577th Schmitt-Very-Cool 582 159 10 days ago 579th Trip-kun 581 136 5 Oct 2024 580th kurkale6ka 581 137 16 Oct 2024 580th 4ndyJ 🇬🇧 581 137 14 Nov 2024 580th Mikey-Beep 🇬🇧 581 137 6 Aug 2025 580th wobblybits 581 137 17 Aug 2025 580th snoozingnewt 🇺🇸 581 137 16 days ago 585th michelebastione 🇮🇹 576 123 26 Aug 2025 586th 823126 574 112 13 Nov 2024 586th dokutan 574 112 22 Jun 2025 588th scpchicken 🇵🇼 573 139 6 Oct 2024 589th KatieLG 🇬🇧 572 99 1 Oct 2024 590th MeWhenI 🇻🇦 569 331 2 Oct 2024 591st NanduBC 568 140 1 Oct 2024 591st jmerle 🇳🇱 568 140 10 Jan 2025 591st RobertHoeh 568 140 3 Mar 2025 591st smilesformiles3 568 140 12 Jun 2025 591st artem-aramma 568 140 18 Jun 2025 596th MeWhenI 🇻🇦 567 164 6 Oct 2024 597th FranklinJiaChen 564 141 2 Oct 2024 598th KatieLG 🇬🇧 561 85 12 Jan 2025 599th brimstonetrader 560 142 17 Oct 2024 599th codewrite 🇬🇧 560 142 5 May 2025 First Prev 526–600 of 770 Next Last