I'm curious as to why you think Zoltan C is the worst ship in the game. For me, the hardest run was Stealth B, since you need need even more scrap then Zoltan C does to be functional (50 for a cloaking upgrade so you can survive most battles, 125 to buy shields from a store, ?? for another weapon, 125 to be able to USE the weapon, along with more engine and shield and reactor upgrades...), plus it's very easy to lose the run to any ship with an attack drone.
I'd put Slug B up there as well, but my very first run with it on hard dropped a Burst Laser II in the first sector, followed by a Flak I being in a store in sector three. That turned into an easy victory...
I'd put Slug B up there as well, but my very first run with it on hard dropped a Burst Laser II in the first sector, followed by a Flak I being in a store in sector three. That turned into an easy victory...