Let's talk about Shin Megami Tensei IV. If you have a 3DS and like RPGs with dungeon-exploring, turn-based combat, and Pokemonesque demon-collection, this is a great game.

As long as you don't mind dying. A lot. My play clock says 22 hours, and I'm not halfway done with the game yet. This clock is a lie because I've had full-party wipes at least 50 times, so add a bunch of hours to that. The difficulty is absurd, but it's really fun once you get the hang of it. I like that the difficulty isn't the sort that you can solve by grinding levels. You have to learn the battle system, learn the enemies' weaknesses, and acquire better demons to help you fight, or you'll never get anywhere. Once you do learn how it works, everything is manageable.

I love Atlus games. I love how vaguely disturbing they are. The story/dialog is just bizarre for no reason. And they don't bother explaining. They immerse you in the world and you kind of slowly figure out how things are. I don't know if it's the same in Japanese, but the translators and voice actors really did well.