The Word Wiz trophy requires you to figure out its 4 related games by filling in their missing letters.  Once you believe you have figured out a game, you can know for sure by visiting its game page and viewing the "Community Info" tab.

First, find the game's individual game page by searching for it.



Click on the game to open its game page.



Click on the "Community Info" tab.  If a game is one of the Word Wiz's required titles, "Word Wiz" will be listed here.



(Please note: Peggle is not a required game for Word Wiz, it is merely being used as an example.)