What I had always loved about Lugi's mansion that NO mario game could beat was collecting money. You may not think of it, but it is bloody fun shaking every little item to try to find a hidden goody, or look for hidden blue mice/ghost, and hidden goodies like the hidden money room where you have to scan a hidden mouse hole to get into it.
In every mario game, you collect 100 coins, you get a 1-up, in Mario64, and sunshine, you even get a star. For galexy it was REAL disapointed you ONLY get a star for collecting 100 purple coins, and you CAN'T MISS ONE OF THOSE F@#KERS! I dispise Galexy for that... For lugi mansion on the other hand, money was COMPLETELY optional, you DIDN'T need if for extra lives, it was just so you could try to get the biggest possible house at the end of the game. In theory it doesn't sound too fun, but for example, when you figure out to water that seed into a flower THROUGHOUT the game outside next to doghouse, you get MANY riches when you do it right!
Also, as you may know, Pearls from big ghost are roughly Half of your money, so the better you defeat a ghost, the more large pearls you get, and the more money you get. And also the more pearls, in theghost gallery the frame of that ghost will be copper, silver or gold depending on the amount.
There are MANY MORE things I could say about Lugi's Mansion I like, but I'll end here, I just wanted to point out the overlooked money system.
