app for 20 questions

any "20 questions" game app?
location: macrumors.com - date: November 29, 2007
I'm about to embark on a road trip and was wondering if there are any "20 questions" types of game apps for the touch. My parents have the 20 questions ball, but I don't want to carry around that thing when we already have our touch. If so, where can I find it? If not, what games do you enjoy?
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