Could it be anything else? The trademark battle royale game that effectively sent the genre's popularity shooting into the stratosphere with over 20 million sales, PlayerUnknown's Battlegrounds is a bonafide phenomenon and it hasn't even been officially released yet.
Let's get this out of the way - Brendan Greene's masterstroke of a game is easily the biggest game of 2017 in terms of sales and one of the biggest of the generation. Thanks to it and its now heavily imitated formula, the battle royale genre is well-known in the industry. 100 players parachute into a massive map and fight to be the last one standing, achieving victory by any means, be it weaponry or vehicular. The game is battle royale at its finest in many ways - tense, suspenseful and full of moments of overblown action but also deafening silence, where the only sound is your pounding heart.
PlayerUnknown's Battlegrounds isn't perfect - it's unfinished and lacks polish in a number of areas. It's got it where it counts however, and the gunplay is nearing on immaculate. The game rewards skill of all kind, and tactics that result in varied and interesting matches. There's a reason it's the genre's flagship - it's the best.