Rollercoaster Tycoon...

[IcemanJer]

...is very addictive... I've spent pretty much this whole afternoon/evening playing it... hehe, made an awesome park that operated for 11 years, but everything started to breakdown cuz they're getting old.

 

[axelfox]

I stopped playing this game because it was too addicting. I build a roller coaster once, but one of the hills was too steep and exploded the the cars.

 

[ArkAoss]

addictive? i've spent weekendsm where i don't stop the game from running till i leave for work monday morn, i'd sleep for like 6hrs, and leave it running, its nice cause you can leave it unatended for good periods of time.