Mario and Luigi

If you played Mario and Luigi on an MS-DOS PC in the nineties, you were experiencing a minor technical miracle disguised as blatant copyright infringement.

Smooth VGA scrolling solved a notorious MS-DOS problem

In 1994, bringing a smooth side-scrolling platformer to the PC was a headache. While Nintendo and Sega had custom graphics hardware dedicated to moving sprites and scrolling tilemaps across television screens, standard PC hardware struggled. Writing a fast 2D action game meant fighting IBM architecture directly, wrestling with video registers, and praying your system hit 30 frames per second without severe screen tearing.

Eighteen-year-old Dutch programmer Mike Wiering built the engine behind Mario and Luigi in Turbo Pascal specifically to prove smooth 2D parallax scrolling was possible on a modest 486 PC running at 25 MHz. He did not build it for commercial distribution or retail shelves. It was a private coding experiment, created to refine the underlying tech he would later use for original titles like Charlie the Duck. To test the momentum, sprite collisions, and scrolling routines, he recreated the mechanics of Nintendo's flagship platformer down to the floaty jump height and brick-shattering physics.

How a stolen beta and Chaos Software created PC shareware chaos

Before Wiering finished his test engine, an unfinished four-level alpha build was stolen from his computer. Shortly after, a shadowy outfit calling itself Chaos Software renamed the executable to Mario!!!, slapped a $15 registration fee on the title screen, and distributed it as commercial shareware. This bootleg version spread like wildfire across bulletin board systems and cheap shareware compilation CDs.

The pirated release was notoriously broken. Because the stolen build cut off at level 4, the bootleg forced an infinite level loop that made the game impossible to clear. Despite the game-breaking bug and illegal distribution, it became a staple on home PCs across the world. The bootleg reached such bizarre pop-culture height that golfer Tiger Woods was even caught on camera playing it on a laptop during a televised segment. To salvage his code and set the record straight, Wiering completed the full six-level game and released the finished game alongside its complete Turbo Pascal source code for free on the web, where it eventually earned its formal catalog entry through Wiering Software.

The mechanics directly mirror Super Mario Bros. with surprising accuracy

Booting up the 2001 free release puts you instantly in familiar territory. You run, jump, smash overhead question-mark blocks, collect gold coins, and stomp on familiar enemies. The weight of the jump feels surprisingly accurate to the 8-bit original, allowing you to build up momentum before launching across wide chasms.

The standard array of power-ups returns in exact order:

• Super Mushroom: Doubles Mario's height, enabling him to absorb an extra hit and break brown brick blocks from underneath.
• Fire Flower: Gives Mario the power to throw bouncing fireballs that clear ground-based enemies from a safe distance.
• Starman: Grants brief invincibility, allowing you to sprint directly through hazards and enemies.
• Gold Coins: Gather 100 scattered throughout the level layout to earn an extra life.

Six short levels lead straight into a punishing second quest

If you come into this expecting a full console-sized adventure, the level count might feel thin. The main campaign consists of just six stages. A skilled player who knows where the hidden blocks sit can sprint through the primary campaign in under fifteen minutes. However, finishing level 6 unlocks the 2nd Quest, which reshuffles the level layouts, strips away forgiving item placements, and introduces trickier enemy placements that demand tight platforming discipline.

What makes the controls distinct from official console releases is the keyboard interface. Trudging through precise platforming with arrow keys and keyboard modifiers takes adjustments, especially when trying to hold a run key while timing a tight leap onto a moving platform. The engine itself feels solid, avoiding the sluggish input lag that plagued many commercial PC action games, but blind jumps occasionally force trial-and-error deaths on your first run.

Play Mario and Luigi free right now in your web browser

While modern players might chuckle at a six-level fan creation, Wiering's engine is a clever piece of PC programming. The engine achieved fluid VGA scrolling when major publishers were struggling to make PC platformers feel responsive, making it an MS-DOS project worth trying for ten minutes just to feel how tight those jump controls really were.

You can play Mario and Luigi online right here in your browser with zero installation required. Fire it up, jump into level 1, and grab your first Fire Flower to see how an eighteen-year-old developer solved smooth MS-DOS platforming thirty years ago.