Glitches and bugged.
Its been a few years unprofessional it is to still have major bugs that make this unplayable. When you get halfway through the campaign mode for the seafarers version it will only allow you to build five settlements when you are supposed to be able to build eight. The computers are allowed to build the full eight. This makes it impossible to win these scenarios. Hell they could not know this after this much time is beyond me.
Spookphish about
Catan Classic, v4.5.0