Board Thread:Off-Topic/@comment-24.45.12.190-20140930201707/@comment-86.178.100.223-20141012102359

How about a Bloon Stronghold Mission. There is only 1 on the map, and it has 30 very tough rounds. The bloons come in on all sides, trying to reach the center and make you lose lives. All towers, highest bloon DDT. Rewards: 10000 City Cash, 5000XP, 100 Bloonstones. The terrain is needed for the new building:

Universal Blimp Production HQ

Costs 180,000 City Cash + 100 Bloonstones, takes up 3X3 squares, allows DDTs, Triple MOABs and Double BFBs.

Also, the Bloonstone Fusion Lab - only 1 allowed, needs Level 30, 100K cash, 100 Bloonstones, 2X2 tiles. Can fuse 10,000 City Cash into 5 Bloonstones, taking 48 hours.