Board Thread:Questions and Answers/@comment-4580263-20130206003959/@comment-3153244-20130206054525

Have you finished all your Vault challenges, track difficulties, reverse mode, etc. yet?

If you haven't, just pick the ones that fit your strategy most.

E.g. If you haven't completed a large variety of Dart Monkey only challenges, then purchase the Dart Monkey Specialty. The same goes for other Specialty Buildings if they are the ones in question. You can also try asking at the NK Forums.

I have nearly $60,000 Monkey Money, own a couple of premiums, no Special Agent Pros and no Specialty Buildings :)