In fact, I'm not sure I'd call it "Adventure Game". This could be more "Interactive Animation", rather than any kind of game.
Our hero(I or you) got stuck in the house of Mad Scientist. He wants to get out of the mansion, but to do that, he must EAT THE ITEM & TRANSFORM to defeat them. And all the journey is w/ 'Brain' who's full of talk.
As I told you above, I'm not sure I'd call this as 'Game'. No move on each area, just click the Hot Spot(Item) & watch weird funny stuffs. When we click the item, they'll do something very unusual. So this could be almost animation itself, w/ some point & click.
But it's really funny, even if all of them are INSANE! Action of items are all insane, eating item & transformations are all insane, ending is all insane, THIS GAME IS TOTALLY FULL OF INSANE GAGS! It reminded me some of American TV animation, which has somewhat weird & wicked (and sometimes INSANE) things. So if you liked some of them, this could be worth to try.
The bad thing is... It doesn't have any English Subtitles as I've written, so non-native-English users could suffer sometimes. And above-the-half of Items(Hot Spot) must be clicked over twice, so sometimes we could get very annoyed. All puzzles are un-logical(I mean INSANE!), so if we lost the way at once, it could be too critical.
But this is really fun & good to go. Really worth to try, if you can handle it. Even if I can't recommend this high, I could recommend average.
Official Re-release Site (Well... It doesn't have lots of things to see, and in fact, 1 ebay seller has it w/ very cheap price for Jewel Release.) : http://www.creaturecrunch.com