Classic oldies: Hunt the Wumpus, advanced cave topologies

I think Hunt-the-Wumpus is one of the earliest computer games in which you have to move from room to room as a player. And at the same time dodging threats and finding treasure ;-)

In modern times, this concept is still the same in adventure and action role-playing games. Take for example World of Warcraft: it's the same, but just with a lot more eye candy.