I've opened about 4 doors, I think. There's been nothing too special in them. More ammo, from what I remember. I personally think it's more worth it to use the nodes for upgrades, but the difference could truly be negligible.Oburi said:Yea now do you spend all your Power Nodes? Because I wanted to get into all those secret rooms that you need to use a power node for, but its tough because I hold off on upgrading and those nodes are expensive, but i don't want to miss anything. Another thing I really like is the main guy your controlling. So far I haven't even seen his face, but that armor suit really grew on me. I just think it's a really cool design for the hero.