simple1

Would you consider making visited links a different color? That would vastly improve the experience for me, since I could see at a glance which content I have not viewed yet, if any.

For example, in the MMO I am creating, you can catch bats, hold them for a while, and then they become your pets (if you don't hold them long enough, they remain wild). Some people gathered up hundreds of bats, then released them in a small room. When other players came into that room, they were swarmed and die. After letting the trap sit for a while, they would return, cast a fear spell to disperse the bats, and then collect the loot.

It was a cool trick, and probably super fun for the players involved. But, if I left the exploit in, it would be happening all the time, and would wreck the game for everyone else. In single player games, the worst a player can do is beat the game using an exploit, which is not necessarily bad.