Rollercoster Tycoon (Score 1)

I know it's been said, but not heartily enough. Rollercoaster Tycoon seems to engage children (and adults like me) far more quickly than any sim-style game I've ever seen. Every child is familiar with the concept of an amusement park, and the chance to build and manage your own seems to suck them right in. I've seen kids get hooked on the game from age 7, and kids as old as, um, 27, play it to death.

-Fuzzy