- A relatively simple, straightforward plot; you have the eventual goal of the end of the game known from the start, (find the Amulet of Yendor, defeat Diablo, etc.) with the game progressing toward it.
- Relatively high difficulty. These games very clearly ignore Todd Howard's suggestion of "let the player win." This includes some diseases/status effects that can be crippling, or some attacks/traps/etc. that result in guaranteed character death.
- Simple control scheme; movement plus at most a handful of buttons. (such as D2's "click-click-click"ing, or NetHack's "walk into an enemy to attack")
- Randomly-generated dungeons and other challenges, that respawn with both monsters and loot after leaving/quitting the game, allowing for, in theory, effectively infinite replayability.
- Randomly-generated loot, often found requiring identification. Some of this stuff may be detrimental to use.
- Often, (but NOT always) a reduced emphasis on graphics. This is actually less intended on its own, but rather a consequence of making a graphical system that can readily handle quickly-generated random locations.
- A heavy focus on combat, with a variety of tactics that are viable.
- Generally stiff penalties for dying. This can range from losing gold, experience, or even outright unrecoverable permadeath.
- No save-and-reload. Typically, the only way to save is to quit the game, making you restart in town. You can't have multiple save slots for the same character.
As of late, though, I discovered a certain series that's been made for the DS: Izuna: Legend of the Unemployed Ninja. So far, I'm nearly beaten it, and I'm thoroughly enjoying it. It's a true RL game in every way, with turn-based movement/combat; unlike most TB RPGs, everyone is shown moving simultaneously, and a button can be held to make turns progress in fast-forward, making sure things take only as long as you need them to. It's definitely a hard game: no save-and-reload until things run right, or getting a save checkpoint every 30 seconds. But if one plays conservatively and well, it's quite an enjoyable challenge.
So what, if any, experience have any of you had with these sort of games?