I, for one, thought SimAnt was one of the most fun games of my childhood. And SimTower... I have a coding interview modeled after it.
> After my lecture, a Maxis employee who shall remain nameless buttonholed me. "You guessed right," she said. "Sim Tower was built around a real elevator simulation program we bought from a Japanese guy."
http://www.gamasutra.com/view/feature/2150/the_designers_not...
For those that care, it's a 32bit executable (playable in 64bit Windows)
A great wee game - I always hoped they'd revisit the idea with an updated version. One day, perhaps!