Klonoa: Door To Phantomille:
This game is a 2.5 Platform that is able to offer many interesting puzzles, tough they won't be really that difficult, but It's rather understandable since It was made mainly for children and It does not leave a single bit of enjoyment that this game is able to give.
The story, while being very "childish" and simple in Its nature, can be also very entertaining and the ending may give you...unexptected emotions.
Going to agree a lot with this, especially since it's my favorite game of all time.