Board Thread:Plants vs. Zombies 2/@comment-27030611-20151002183350/@comment-25089892-20151002184722

Every Endless Zone has totally random chances for zombie spawns, amounts of waves, and such. You're just being lucky. I find BBB one of the harder ones obviously because of the low space for planting and the fact that normally at first subwave, first zombie would trigger the next subwave upon absorbing 5 NDS (losing arm). In case of BBB, he triggers it after losing 2 NDS (losing hat)