If we're talking gems, I'd say Papo & Yo, because I probably never would have heard of it had I not seen the ql.
Also, after watching a few episodes of the P4 endurance run I decided I wanted to get in on that action so I played P3:FES and (bought a Vita and) played P4 Golden. Then I watched the endurance run and bought the 3 spinoff games when those came out... I don't even like fighting games.
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