How do you download the full roller coaster tycoon 2 wacky worlds for free?

If you're talking about the first RollerCoaster Tycoon, try putting it into google and see what comes up. Piracy isn't supported, but if all else fails, put "Rom" after "Roller coaster tycoon", and you should get a result or five. But try looking around in a few bargain bins - the game should be very cheap.