Board Thread:Questions and Answers/@comment-75.159.4.201-20140317211832/@comment-86.178.102.112-20141017172604

MvM only costs bloonstones if the amount of Bloontonium that it will cost it more than what you have, or you turn on one of the extra options.

Why not try to beat Cave or Volcano terrains or to win contested territory, or to beat all the nearby Wattle Trees missions.

A Bloonstone Generator would be possible, now that bloonstones are renewable (Contested Territory), but should require bloonstones to build and cost City Cash to make Bloonstones. Maybe 10K City Cash into 10 Bloonstones, taking 24 hours?