A Carmen Sandiego game about math seems rather misguided, like a turn-based King of Fighters Facebook game or a FarmVille clone based on The Oregon Trail.
Final Fantasy Origins on PSN this late is kind of silly, considering you can get superior enhanced remakes of both games on the collection on other platforms - including one of the platforms supported by this version.
I have the game that King Arthur game is a sequel to. I still haven't played it, but it's supposed to be like a Total War game with an RPG twist. The sequel is supposed to improve various things people complained about in the first game (I wouldn't know what stuff, for reasons given).
I'd get Zen Pinball 3D if I had a 3DS.