Have you made in-app purchases within that game ? You can try contacting iTunes support via this page : http://www.apple.com/support/itunes/contact/ - click on Contact iTunes Store Support on the right-hand side of the page, then Purchases, Billing & Redemption
If you don't want to be able to make in-app purchases on your device via Settings > General > Restrictions > In-App Purchases 'off', and depending upon what version of iOS that you have on it you may also have a Require Password setting on the Restrictions screen which you can set to 'Immediately'.
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