Knights also move from being cards to being tokens on the board. You use the commodities to upgrade your cities through different levels to increase the speed of you earning progress cards. Progress cards are gained by developing your cities, and can't be bought. The development cards are not used and progress cards in three colors are now used. Cities, now instead of producing two resources, produce a resource and a commodity for ore, wood, and sheep. Three commodities are introduced to the game: Coin, Paper, and Cloth. (Random maps on Seafarers is a favorite of one of the people I play with, and how we usually play.) Besides adding boats which are roads going across the water, and a pirate to act as a robber, Seafarers doesn't significantly increase the game.Ĭities & Knights was the second expansion for Catan and take the base game and builds up on it. The game comes with a number of different scenarios and the ability to create maps with random landmasses. The expansion expands the size of the board and gives you the ability to have islands separate from Catan. There is also a third expansion, Catan: Traders & Barbarians, but that isn't as popular.

I would check out the answers there for some other opinions on that expansion. I previously asked the question, 'How is gameplay improved in the Cities & Knights Expansion?' recently before buying it myself. The two biggest expansions for Catan are Seafarers of Catan and Catan: Cities and Knights.

Catan expansion pack