I saw my daughter using one of her empty mechanical pencils as a stylus on her DSI. I am sure it could be used on any electronic which has a touch screen.
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Video game systems are expensive, but adding games to play with the system really breaks the budget. There really isn't a way to avoid the cost without avoiding video games completely, but there are ways to lighten the burden.
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Tips and ideas for saving money on video games. Post your ideas here.