This game is wonderful!  I couldn't believe the amount of physics in this game.  You have a lot of rides to choose from, and endless opportunities!  One really good thing about this game is that there's a lot of levels, which is really suprising for a sim. game.  The game has a nice learning curve, although it's pretty difficult to make a good roller coaster when you're inexperienced.  The graphics are really good, considering it doesn't take much to run the game.  It's really fun watching roller coaster cars going fifty miles per hour through loops, corkscrews, helixes, and many more special track designs.  Sound is great also.  You hear people laughing, screaming when you overlook your park masterpiece.  The conversation sounds even get louder when you get to more crowded areas.  This is a great game; I suggest every sim. lover should buy it.