
The Dark Spire is an RPG for the Nintendo DS. It's heavily inspired by classics like Wizardry and The Bard's Tale.
In other words, it's a first-person turn-based RPG with a penchant for kicking your butt.

The story is very barebones; essentially some evil wizard stole the royal jewels and holed himself up in a massive monster-infested spire. You goal is to reach the top and defeat him, of course!

It's got all the usual aspects of an old-school dungeon crawler; you create a party of characters utilizing 4 different races (technically 6) and 4 different classes (not including the 6 prestige classes) and set off into the spire to fight unrelenting thieves, bats, mushrooms, wizards, zombies, ghosts, goblins, and even the occasional killer bunny.
The battle system works just like any other turn-based RPG; when battle starts, you have three options: Fight (start the battle), Run (flee), and Look (examine the enemy). If you choose to fight, you can attack, defend, cast a spell, run, etc. A neat little aspect is that each command has a few sub-commands; i.e., you can choose to attack precisely, for increased accuracy but slower speed, or quickly, for less accuracy but higher speed.

There's a few quirks, derived from the mostly AD&D rules. The most counter-intuitive is that the lower AC (Armor Class) the better. Why that is is pretty confusing, and I'm not sure I understand entirely myself, so look up THAC0 on Google if you want to know. Also, spells work without magic points; instead you have an allotment of spells (like, say, 7 1st level spells, 5 2nd level spells, and 3 3rd level spells) that, once used, can only be restored by a stay or meal at the inn.
Among other things, it has an awesome soundtrack. http://www.youtube.com/watch?v=umaIdApRcuQ
Finally, if you're feeling particularly nostalgic, it has a "Classic" mode which reverts the graphics and sound to look like it jumped straight out of the eighties!

And a side-by-side comparison:

My party currently consists of a level 5 dwarven warrior, a level 5 human priest, a level 5 elven mage, and a level 4 elven thief, because halflings aren't good at magic and I want my thief to learn spells.
The only catch is that it was published by Atlus. For the uninformed, Atlus published loads of the incredibly niche games, but not in high quantities. It'll probably be hard to find, but since it only released a few months ago, there may still be a chance. So what are you waiting for? Go! Go get it!