While I have be trolling forum boards looking for 3 and 4 player game rules I have found that people are playing it with out a second core set and this though possible would seem to make the game to easy. I have seen many reasons for needing a second set, such as 2 more trackers and more cards for tournament player deck. I have not seen any about the additional encounter cards. Would not the encounters card keep the game balanced? Most expansions have between 20 and 30 card that go into the encounter deck where the core card have 10 to 20. With the addition of 2 caught in the web card a scenario could get very tricky.