Finally

I finally managed to clear Tier 2, Wave 100. It took quite a while... Maybe because I didn't upgrade my attack. Then, after equipping the unlocked module, I cleared Tier 3, Wave 130 in one go, and then reached Tier 4, Wave 91. I was really stuck for so long... The 'Sentry Protocol' module seemed really strong. Just a little more to go for the point-earning quest, Tier 4, Wave 100!