2. Game of War: Fire Age

Game of War is certainly one of the most popular mobile games out there. And this is no small part to the game’s massive ad campaign, which has cost developer Machine Zone a whopping $40 million. The campaign stars no other than swimsuit model Kate Upton, who lends her sultry curves to a series of rather impressive ads, such as this one.

As for the game itself, it’s a rather involving multiplayer strategy game, with an emphasis on forming alliances with other players and planning out strategies. It’s free to play, but there is a catch: it’s hard to make progress, let alone win, unless you spend real money. The game features a series of microtransactions (which are offered by a cartoon version of Kate Upton) which allow you to skip build timers, resource collection or buy gold. Like in the free market, you can pay to get an advantage, even if your only reward in the end will be victory in a mobile video game…

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