Nintendo systems are usually seen as being the more casual choice compared to their competitors due to their accessible library of games, but this isn't to say that they lack titles that drastically ramp up the intensity and challenge. Strategy games might not be the most popular genre for Nintendo, but systems like the 3DS actually have a handful of these titles to pick up and play, which never go too overboard in their difficulty, but are still deeply layered in their core gameplay and mechanics.