Most people may not know Supercell, but their titles "Clash of Clans" or "Clash Royal" should ring a bell, because they are always among most downloaded and, more importantly, top-grossing apps in any appstore. With less than 200 employees and basically 3 games titles, the company based in Helsinki makes 2.3bn USD in revenue in 2015 - and almost a billion of that is profit. Made from 100mn people who play their games every day. Amazing.
Read more here:
or check their funny video (Tuvalu!!) here: