You have no time to just free roam the game, controls are terrible, and when you get to the secret mine boss, have fun sending this game back, because that part is very stupidly made, how you have to worry about the boss regenerating, you health, and the meter of the bomb launcher, so you have 3 parts that make that boss fight terrible and ridiculously challenging.
I loved the original Luigi's Mansion and looked forward to playing this, while I didn't hate it I would say this game is not good for renting as it is slow to start and takes time to get anywhere. I also don't like that you can only save by finishing an area rather then using a save point.
I found this played the same, if not better than the GC version. With lots of hidden treasures, cool ghost concepts, and nifty graphics for a 3DS, dude its a solid ghost busting title with fun factor in the above average range. Rent it, love it, buy it. Thanks for your time. Game on!