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Instead of buying individual apps from the Sago series, you can subscribe for $4.99/month to the Sago mini World app. It's great value and every game is interactive, cute and fun for the kids.
Once your kids get their fill of Endless Alphabet, consider getting the Endless Reader app. This is a little bit more advanced, but just as fun.
Kids
The age range I'm setting here is for kids 6 to 10. Kids should be able to start basic reading to pick up on these apps.
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