Ultima Underworld II: Labyrinth of Worlds

There's no hand-holding. No quest journal, no arrows pointing the way. If you're not playing with a hint book by your side, you'll need to really think. It's pretty hard. Easy difficulty is for the average guy, normal is for grognards. There's no level scaling. You will bump into monsters you can't beat at that time. For example, right inside the entrance to the sewers is a headless. it will murderize you at normal difficulty, and is very tough even at easy. Avoid it and come back later. There are more monsters deeper in the sewers that you won't be able to beat for a dozen more levels. It's best to be a swordsman. The sword trainer (Lobar in Killorn Keep) is twice as effective as the other trainers. Also, strength determines how much you can carry, which is very important. Most locked doors need to be bashed open. Carry a few shitty weapons for this. Use the look command on everything. EVERYTHING. When you look at a monster, if it is not hostile, do not attack. After you clear the prison world, you have a choice of Killorn Keep or an ice world. Choose the former first.