For Bloons TD 5 buildings, see Specialty Buildings.
You will not easily deal with MOAB-class without some serious power. Tier 4 Monkey upgrades require Special Buildings to unlock. Build a Special Building for an upgrade, then research that in the upgrades menu.
~ "Real Power" goal description

Special Buildings in BMC are buildings that unlock research for a fourth tier upgrade or a third tier Super Monkey upgrade.

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