Round 10004 constitutes the first round limit in Bloons TD 6. It consists 100 ZOMGs, having 192,046,000 health each. ZOMGs are only slightly slower than BFBs, are resistant or immune to multiple statuses, and are significantly tankier.
Rounds 10002, 10003, and 10005 have 100 MOABs, 100 BFBs, and 100 DDTs that can just cruise through the entire map. They're all faster than ZOMGs, so they can avoid being stalled near flawlessly.
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