Exactly like a G Rated Grand Theft Auto!
You're given missions to accomplish before you can go on to the next level which will be another family member in another part of town. Though the game isn't as wide open as I'd like it does a good job of filling the space within the cut up sections. There are tons of vehicles you can drive and if you need to get somewhere there are plenty of helpful drivers on the Springfield streets whom will drive you to where you need to go (instead of car jacking them you actually control them instead of your given character).
After your main missions are accomplished there are still side missions you can do and things to collect so this game will keep you busy for quite some time! Again there are many vehicles shared between all the members of the Simpson family and even some hidden vehicles which are really fun to putt around in! The graphics are crisp and the game play is extremely fun, although it barrows heavily from GTA it takes on a life of it's own with plenty of quirks and quips, this game is just good Simpson's fun!