Seasoned adventurer or greenhorn, you'll find something to appeal to you in Etrian Odyssey 2 Untold. You'll come for the story, and stay to obsessively map every dungeon and best every monster.
Back in 2007, Atlus decided to use the Nintendo DS to do something ambitious. It brought back the days of first-person RPGs with original party members you had to customize and dungeons you needed to map. Thanks to the handheld's design, the bottom screen allowed people to practice cartography as they played. Since then, 10 games have been released, each bringing something new to adventurers.
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This is a really deep dungeon crawler; there is so much to always be doing, tweaking your party to be the best it can be. Get invested, and you'll be playing this for a long time.