Sound does not work in some apps on my iPad. - ok in video, iPod tunes, Skype, iPlayer - no sound in games Milli

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Sound does not work in some apps on my iPad.
- ok in video, iPod tunes, Skype, iPlayer
- no sound in games Millionaire, Osmos HD , Birds of Britain HD, and eg keyboard clicks and mail sounds.

My new iPad was working fine until last week, when I purchased Birds from iTunes and it had no sounds, even though it should have. Tried all obvious settings with no success. Removed Birds but still no sounds, reinstalled but no sound. Tried all Apps to see which had sound - sound does work in some apps, so maybe a bug or setting needs to be fixed.

Reluctant to reset to factory settings unless that is the only answer.

Please help
Catherine