Uncommon
Killer application
Software term
Killer application
A killer application (often shortened to killer app) is any software that is so desirable that it significantly boosts the value proposition of its associated technology, such as its host computer hardware, software platform, or operating system. Consumers would buy the host platform just to access that application, possibly substantially increasing sales of its host platform.
Open boosters, collect cards and trade them. Free to play.
Play for free