The cheapest and most effective tool that any marketer can use to promote a product is word of mouth - but some of the time, it's not the company themselves making the buzz about their own product.
The Wii U is a brand new console - one that plenty of avid video gamers (mainly the ones that will keep track of anything new in the gaming industry) will be excited to learn about. And now with the Internet becoming so much larger and giving so many people new opportunities, there has been a new door opened for advertisers that costs them no money at all - in fact, they earn more money than what they spend.
Let's Play is not a new phenomenon but in the last year it has grown to the extents that there are now YouTube channels in the top 100 most subscribed that are just people playing a video game for people's entertainment. They can average 2 million views on each of their videos each day and they are effectively promoting the product for free.
The example that I have given above is the most subscribed Let's Player on Youtube, Felix Kjellberg - a Swedish YouTuber better known by his username PewDiePie. At last count, he has over 5.5 million subscribers meaning that every single video that he posts is reaching that amount of people every single day.
For the Wii U, this is a very good way of showing off what the console can do to a more mature audience - mainly those aged 18 to 25. The game that Felix is playing in this Walkthough is the first game to be released with the Wii U called ZombiU.
Not only does he show off the improved graphics whilst commenting on the quality of previous Nintendo products, he shows live game-play and gives his opinions through out - pretty much giving the audience a video review of the game.
It's an endorsement of sorts as so many more people are likely to watch this and hear of the Wii U and it's games through people like PewDiePie than they are watching TV. It's free niche marketing.