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Round 121 is a round in Bloons TD 6. It consists Fortified MOABs, BFBs, and ZOMGs.
14 Fortified BFBs start to spawn, after a while, 28 Fortified MOAB-group also join the game. Then 6 Fortified ZOMGs spawn at the end of the round.
This round has similar concept as Round 120, but this time, they are all fortified. Shattering Shells can effectively reduce the round's difficulty as Round 120.
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