Here are a few multiplayer tips.

1. Stick to the edge of maps.

This might sound simple but it really helps, running through the centre of the map isn't going to help you get kills infact it will just get you killed. When using this tip use Assualt Rifles, Sub-Machine Guns or the RPD. Remeber don't get caught in the open, if you get hit run or find cover. This is an excellent tatic for getting Nukes and other high killstreaks.

2. Stealth is important on big maps

This is true as on big maps you find a lot of campers and you don't want them to know where you are as they will just pick you off very easily. There are two types of stealth classes:

1. Running

This type of class is where you are running but you want to sneak up on your foes. Good guns for this are- UMP.45 Silenced, TMP silenced, and the M93 Raffica Silenced. You should use Marathon, Ninja and Cold Blooded.

2. Camping

This class is for total noobs. You are best using Claymores and a silenced Assualt Rifles. You should still use Cold Blooded and Ninja but use Scavenger instead of Marathon as you will be in the same place and can pick up another claymore off the person you kill with your first.