Those games are great, and here is another one:
Nethack.
Nethack is a dungeon exploration game og amazing proportions. There is so much to do and so many areas to explore that after playing the game for nearly 10 years I am still not near to completing it. In addition the game is so hard that I keep being killed (in various amusing ways) all the time and have to restart.
So for those who care more about the depth of the game and not the graphics (and that is why we play WOK, right?) I can really recommend Nethack.
I was just killed by a horde of giant ants that turned out to be poisonous. Poor Mullog the Valkyrie tried to hide in a shop, but the shopkeeper was happy to let the ants in to kill me since he then got all my possessions...

Quidquid latine dictum sit, altum sonatur.
- Whatever is said in Latin sounds profound.