Call of Duty: Modern Warfare 2 arrives on October 28, and Activision has detailed all the challenges and level progression available on day one. This gives players 20 days of preseason leveling to unlock weapons, attachments, and some additional operators to use across multiplayer, Spec Ops, and the upcoming Warzone 2.0.

Weapon progression

In addition to leveling up in the military ranks, players will also want to rank up across Modern Warfare 2's weapon Platforms. The game features 33 Platforms and a total of 51 weapons to unlock, most of which have attachments to unlock as well.

With this new weapon Platform system, each Platform has a unique progression tree, which details every unlock within that platform. For example, once a specific barrel is unlocked for one gun, it's then made available to all weapons in that same shared Platform. Some attachments will be Platform specific, while other attachments will be universally shared with other compatible weapons. This sounds more complicated than it needs to be, but basically, this allows players to unlock attachments faster, since they don't have to unlock the same attachment over and over for different guns.