questionsis it worth it to get an ipad 1 for under $150…

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Some will work some will not work matters on the app and its programming

vote-for2vote-against

The price sounds OK if you get any kind of warranty with it. I'm not sure how far you can update the IOS, but I'm pretty sure it will go a version or two above stock....that should cover several game apps.

vote-for2vote-against

the newest apps will likely not work and most apps have been upgraded to the new iOS and are getting rid of compatibility with previous versions. for kids games I'd grab a cheap android tablet.