User blog comment:RoznosicielCiast/More upgrades for Viktor's Hex Core!/@comment-124.171.71.29-20130316013531/@comment-65.112.145.53-20130316021443

The idea is that you'll start with the basic hex core and then you can choose one of the three existing upgrades (or the 4th upgrade for the ultimate), and each one branches out into two more upgrades. But you can only have one base upgrade and one of the advanced upgrades to supplement it.