Board Thread:Dragon City Questions and Answers/@comment-79.229.151.159-20130326173052/@comment-3271569-20130326174603

Would only work if you buys the formule first. Except if the internal id turns equal (what's an bug). So if you got one by this way you just abused an bug or used an hack to get one.

Both abusing bugs as hack are against the social point and wika policy.