It's hard to believe that I've been playing this game for nearly 20 years. My favorite game (ever) has just released on Steam this week. If you like RPGs and/or Roguelike Games, you owe it to yourself to check out Ancient Domains of Mystery (ADOM) on Steam. Since this is release week, it's on sale.
Get It Here: http://store.steampowered.com/app/333300
If you aren't familiar with ADOM, it's a roguelike game. Maybe you've heard of Rogue, Dwarf Fortress, Nethack, Heroic Adventure!, etc...? It's best described as a Tactical-RPG where death is permanent and all items are randomized when a new game is created. Discovery is a huge part of a game like this, and there is plenty to discover here. Villages, Magic, Story, Questlines... ADOM has it all, and is one of the original roguelikes.
You may be thinking, how is this a roguelike... it's too pretty. It's true, ADOM has gotten a fresh coat of paint, along with some necessary engine overhauls to make it work in the Steam ecosphere, but it's still very much the same game at heart. In fact, ASCII mode is only a couple of clicks away if that's how you roll. (Though I have to admit, the new interface is really sweet.)
I've only gotten a few games in since release yesterday, but I can attest to many, many late (all) nighters with this game. There's a certain threshold that once you get past it, in terms of progress, you really don't want to stop, for fear of angering the RNG gods.
If you're looking for a fun, but brutal, RPG... you owe it to yourself to pick this one up.