I'm surprised to see lost in blue and the word FUN in the same sentence.
't is not the same sentence. except when you placed the two in one sentence
yourself.
Either way...
Digimon is quite fun, but I reckon it's not enough fun to actually buy it.
FF XI, III and the new one are pretty fun as well, as is Dragon Quest
monsters: Joker (as has been mentioned).
Other than that... Luminous Arc is a nice strategy RPG. You might want
to try it.
EDIT: And whatever you do, don't waste money on Assassins Creed.