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.
Some fun history on SimTower: > 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...
There is a sequel to SimTower from the same designer
https://en.wikipedia.org/wiki/Yoot_Tower
For those that care, it's a 32bit executable (playable in 64bit Windows)