Round 108 is a freeplay round that makes its debut in BTD6. It consists of numerous ZOMGs (9 normal, 10 fortified). This round is more difficult version of Round 103, where many MOABs and Fortified MOABs spawn alongside 10 Fortified ZOMGs. This round has more ZOMGs instead of Packed MOABs. Also this round has the similar round format as Round 81, but now first BFB group is upgraded to ZOMGs, and second BFB group is upgraded to Fortified ZOMGs.
The round begins with a long line of ZOMGs. After the 6th ZOMG has been spawned, Fortified ZOMGs also join the game, slightly tighter than the ZOMGs.
This round can be very dangerous if the player struggles against numerous strong blimps. Barely surviving this round means the player will also struggle with Round 111, which has even more ZOMGs and Fortified ZOMGs.
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