Something where you type in an app, and it returns the answer to that query.
You can try pasting the following line into google:
"zaxxon escape" site:itunes.apple.com/us "optimized for iphone 5"
Replace "zaxxon escape" with whatever you're interested in to see if it includes the text "optimized for iPhone 5". Note that a game will qualify if it has a tall "loading screen" and the regular game play is the old size.