Mario isn't the only thing that's missing in this game...
This sounds like a cool game. I like the idea of mario being kidnapped and luigi going to go rescue him. But it just isn't.
Luigi also needs to answer these annoying as hell trivia questions in order to return the items. That's what really killed this from being a really cool game. The music didn't help either.
I think Nintendo should take this idea and remake it the way it should be: For Fun.
And in this game, there are no lives, no health points, you can't get hurt in this game. The enemies just walk right past you. You just jump on their heads.
Other games like this are:
Mario Is Missing! (NES, SNES, PC)
Mario's Time Machine (NES, PC)
Mario's Early Years: Preschool Fun! (SNES)