According to Wikipedia, Namco has a patent on the concept. http://en.wikipedia.org/wiki/Loading_screen#Minigames
It looks like there is some prior art, but going up against Namco wouldn't be very fun. It'd be nice to see this patent overturned, so that more developers could implement loading screen minigames without fearing legal trouble.
--- Recording medium, method of loading games program code means, and games machine ---
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sec...
According to Wikipedia, Namco has a patent on the concept. http://en.wikipedia.org/wiki/Loading_screen#Minigames
It looks like there is some prior art, but going up against Namco wouldn't be very fun. It'd be nice to see this patent overturned, so that more developers could implement loading screen minigames without fearing legal trouble.