The recent spate of new 3DS StreetPass games made a pretty penny for Nintendo. Sold for $5 each (or bundled together for $15), the four games included Mii Force, Flower Town, Warrior's Way, and Monster's Manor. All of them take advantage of the StreetPass functionality in some way, so they're best when you know you'll come in contact with other 3DS owners. They also give new hats to personalize your 3DS Mii.
After only a month on the eShop, the games generated about $4 million in profit, Nintendo president Satoru Iwata told Tokyo Keizai Online (via Siliconera). Who knew that Nintendo's bundled Mii games on 3DS would ever become so lucrative for the company?