I finished the main story in PS0 and thought about making the difficult ( 9 of 10 stars as i remember) sub-missions There's one mission you walk through a tower which is veeeeeeeeeeery tall... I've seen 3 "sections/parts" in the tower and each got an own color.. The first one is blue in some underground area and the colors in the tower glow blue. The second part got green lights and you can see some fields if you watch out of the windows. The third is glowing yellow .. And all you can see is sky out there... Each "part" got about 20-floors and i guess 2 bosses ( i didnt count cuz it seemed senseless) Well.. after about two hours of hunting through the tower I had a nice bunch of rank 6 equippment and 0 motivation to go any further (maybe that's why it's called PS "ZERO"). I gave up after a few floors after the second boss in the yellow part , because the color after yellow was.... you got it.. YELLOW .... Does anybody know if this mission had a goal ?