I found out that completing stage 1 (Southport) in campaign mode
at normal difficulty with only a hero (no towers, no spells) is pretty
fun At least it is in my eyes. The only hero failing here seems to
be Sir Gerald Lightseeker. King Denas actually seemed most simple,
while I didn't expect that at all. I guess Alleria Swiftwind provides the
best possible 'challenge', although it's still quite easy ^^ Have fun!