I bought and started playing Call of Duty Modern Warfare on the 13th of April when it was on sale. I purchased the game via the Battle.net launcher and not through a third party key seller. The game includes a Single Player campaign, Multiplayer and Co-operative gameplay as well as the new Warzone which includes various versions of the popular Battle Royale mode. Call of Duty Warzone can also be downloaded separately for free, without the need to buy the base game. Due to the recent controversies surrounding the use of loot boxes as a business model, Activision have instead implemented a Battle Pass system which is tied to the games “seasons”. A season runs for about 50 plus days. The current one (season 3) is scheduled to end on June 2nd. Here is the official blurb regarding how the Battle Pass system works.