I finished The Keep on the 3DS. If you love old school, western-styled dungeon crawlers--like, say, Legend of Grimrock--and want more of that, and portable, then you should get The Keep. The game is far too rare a gem on the 3DS, but is a fantastic experience, even if it doesn't do a lot too terribly new. The only issue I had was the somewhat awkward learning curve for physical attacking, but after I realized I wasn't just supposed to swipe the touch-screen like a madman, it fell into place and was very enjoyable.