Card Number Validation in all languages in chars. 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 Chars Time Submitted 525th StefanHabel 🇨🇦 598 108 24ms 23 Jan 2025 525th CaedenHarper 🇨🇦 598 108 17ms 22 Jul 2025 528th dokutan 598 117 2ms 3 Oct 2024 529th MeWhenI 🇻🇦 597 98 7ms 1 Oct 2024 530th arcpolaris 592 120 358ms 28 Jan 2025 531st SirBogman 🇺🇸 591 64 11 Jul 2025 532nd bac0id 589 119 2ms 10 Jan 2025 533rd cros107 🇦🇺 587 110 17ms 1 Jan 2025 533rd guilhem-roy 🇫🇷 587 110 18ms 29 May 2025 535th DialFrost 🇸🇬 586 67 9ms 25 Jan 2025 536th JunkIce 585 98 398ms 3 Dec 2024 536th commandblockguy 🇺🇸 585 98 1 Sep 2025 538th gigaprofisi 🇺🇸 585 110 11 Aug 2025 539th dokutan 584 174 5ms 21 Feb 2025 540th h3ra993huskp 🇯🇵 583 159 25 Nov 2024 540th Schmitt-Very-Cool 583 159 25 days ago 542nd mousetail 🇳🇱 582 111 22ms 6 Oct 2024 543rd Trip-kun 581 136 2ms 5 Oct 2024 544th Mabeloid 🇳🇴 579 121 23 hours ago 545th MeWhenI 🇻🇦 578 111 88ms 2 Oct 2024 546th michelebastione 🇮🇹 577 123 26 Aug 2025 547th dokutan 576 102 30 Aug 2025 548th OllieBoyne 🇬🇧 576 112 23ms 17 Oct 2024 548th WillConker 576 112 11ms 22 Oct 2024 548th maxgodfrey2004 🇨🇦 576 112 14ms 4 Jan 2025 551st MeWhenI 🇻🇦 576 331 18ms 2 Oct 2024 552nd CaedenHarper 🇨🇦 574 100 574ms 22 Jul 2025 553rd 823126 574 112 13 Nov 2024 554th KatieLG 🇬🇧 572 99 1 Oct 2024 555th MeWhenI 🇻🇦 567 164 212ms 6 Oct 2024 556th blaztoma 🇱🇹 566 114 18ms 27 days ago 556th solisolu 566 114 5 days ago 558th jipsong 🇩🇪 561 115 17ms 12 May 2025 559th CaedenHarper 🇨🇦 559 105 24 days ago 560th aliakseikalosha 559 127 354ms 10 Oct 2024 561st rowechenzhong 556 116 13ms 17 Oct 2024 562nd albanian-laundromat 556 343 5 days ago 563rd madex 🇩🇪 554 116 1 Oct 2024 564th MeWhenI 🇻🇦 554 290 9ms 2 Oct 2024 565th JDiLenarda 🇫🇷 553 165 1,282ms 1 Oct 2024 566th dtbao20 🇻🇳 552 117 18ms 1 Oct 2024 566th Pyroan 552 117 17ms 22 Feb 2025 566th vgamula 🇺🇦 552 117 22ms 5 Aug 2025 569th edsrzf 🇳🇿 551 135 6ms 27 Feb 2025 570th msbranicky 550 185 4ms 20 Jan 2025 571st mousetail 🇳🇱 548 128 2ms 3 Oct 2024 572nd elgan65536 547 118 11ms 2 Oct 2024 572nd logvp 547 118 19ms 6 Oct 2024 572nd ahmetdemirag 🇨🇾 547 118 10ms 6 Feb 2025 572nd dirckvdende 547 118 21ms 10 Jul 2025 576th emgordon154 546 52 3ms 3 Nov 2024 577th zakariamouhid 545 118 1 Oct 2024 578th xyangst 543 171 193ms 1 Oct 2024 579th jtaxen 542 119 21 Oct 2024 579th psbpsbp 542 119 14ms 19 Dec 2024 579th klixel 🇨🇦 542 119 11ms 9 Apr 2025 582nd najs91 542 131 382ms 15 Oct 2024 582nd bac0id 542 131 375ms 9 Jan 2025 582nd CaedenHarper 🇨🇦 542 131 5 days ago 585th eranws 540 119 23 Dec 2024 586th TaserTheFox 🇺🇸 538 120 19ms 8 Oct 2024 586th yokasuretsu 538 120 11ms 26 Jan 2025 586th Troon 538 120 9ms 17 Feb 2025 589th Sciman101 537 147 2ms 26 Mar 2025 590th BREMAUCY 🇫🇷 533 121 20ms 18 Jul 2025 591st deancureton 532 121 30 Dec 2024 592nd msbranicky 531 175 189ms 13 Dec 2024 593rd chartung17 529 122 10ms 24 Mar 2025 594th msbranicky 527 126 9 Jan 2025 595th msbranicky 525 123 17ms 3 Oct 2024 595th bobbysq 525 123 11ms 5 Oct 2024 595th wuzekai518 525 123 11ms 8 Oct 2024 595th vhoulbreque 🇫🇷 525 123 14ms 4 Feb 2025 599th galloj 🇨🇿 522 112 27ms 4 Oct 2024 600th NotEvenIndian 521 124 11ms 22 Oct 2024 First Prev 526–600 of 780 Next Last