When playing The Sims as a kid, there were loads of expansions, but you only needed the last one in the chain you had installed to play. So if I had 1 and 2, an

When playing The Sims as a kid, there were loads of expansions, but you only needed the last one in the chain you had installed to play. So if I had 1 and 2, and a friend 3 and 4, I could buy 5 and then borrow my friends disks and install those. Or if it was a game for a LAN, just boot the game with the CD in, then pass the CD along for others to do the same.