Considering I finished FF XIII twice, got rid of it for taking the issues too seriously but decided to bring back to my collection and felt amazingly frustrated by the joke I thought FF XIII-2 is (meaning: the complete difference in tone, time-travelling and fetch quests abound plus DLC driven), I've been wondering if I should try Lightning Returns: Final Fantasy XIII.
Heard good things about it and it's sorta "like" Majora's Mask (limited time to finish that can be extended it seems). Don't know if it wraps up the trilogy in a decent way but what I'm really looking for is some challenge (which it may be up the task...)