Bugs that actually evolve. Every nest has its own genome and produce waves of bugs, most with mutations. Over time they learn to build new nests, gather armies, behave smarter and move up to higher tiers. The most important part: the bugs are HIGHLY ANNOYING.

Best played on a DEATH WORLD. Be ready for bugs to attack non-stop from the start, but they usually stay at their weakest form for a long while, so you have time to get your defenses up before they evolve into something worse.

Easiest way to deal at the start is to create a circle of defense around polluted areas and with constant supply of ammo. Basic ammo will defend you forever, just need a constant supply... unless higher tiers evolve!