Squad
This hyper-realistic first person shooter initially released with no real advertising or fanfare. With it being on the more expensive end of early access games, the price of entry was too high for those who were not familiar with the game and what it had to offer. That all changed when bigger streamers got a hold of this game, showing their thousands of fans how not all first person shooters needed to be mindless to be fun.
The best streamers that showcased this were those who role-played in their combat scenarios, using realistic chatter and tactics to help them win their matches. After these were shown to the viewers, the game grew a considerable amount. According to Twitch, as of July of 2016, streams of Squad have accounted for over 10% of the game’s total sales.