you can get quiet a lot of free games from the app store but there are to many to name so i will give you this one app that is free and it searches for free apps and games and limited time offer on them that make them free. the app is called 'free app tracker'
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Games for the iPod Nano and iPod Classic cost about $4.99 each. However, there are certain apps for the iPod Touch and iPhone that are free.
you have to have an itunes account.
There are several free games such as Paper Toss and Waterslide. What you see as "fun" is up to you.
Yes, but some cost money. You can buy them on the Apple Stiore ( App Store)
itunes