Do you know the Japanese words called "OSSAN"? It means "middle-aged Japanese men" in Japanese. Japanese game startup comcept(It is the company which Keiji Inafune established!) released iOS game apps that make boiled eggs of Ossan "Boiling OSSAN Eggs!". And it broke through 300,000 downloading from release in one month.
"Boiling OSSAN Eggs!" is simple casual game that boild eggs in a boiling pot and make various boiled eggs. However, all boiled eggs are middle-aged Japanese men. When we peel off the egg shell, a face of OSSAN appears. And we collect various OSSAN eggs and complete pictorial record.
When we collect many different kinds of boiled OSSAN eggs, we can get a new boiling pot. We can make even more different kinds of boiled OSSAN eggs.
This is a general casual upbringing game in Japan. It is simple, but is still extremely popular. Those representatives is Nameko Saibai Kit(Mushroom Garden a.k.a. Funghi Gardening Kit) series. Boiling OSSAN Eggs! is not cute unlike Nameko, but it is very surreal. So it gets popularity by only word of mouth.
By the way, according to them, this app demonstrates the irony of the modern day world. New egg (a baby) being thrown into the hot boiling water (the society), results in each unique boiled OSSAN egg. Unfortunately this has only Japanese support, but we can download this from App Store except Japan.