you have to be online to level up in multyplayer.you can level up in splitscreen and system link seperately
if you play xbox become my friend message me telling me that you found my gmertag in wikianswers
gamertag is Steeler12345
Become a herm
If you are in a private offline match, yes, you level up just like you do online and you will unlock the class customization at level 4.
Play online
the single player modern warfare is a campaign story, and the multiplayer has different game modes where you compete against other players and level up, but theres no story.
you level up and earn them all
Complete challenges and level up.
You leave it up to Infinity Ward.
To get the Scar you have to find a online game and play it if you are good at kiling people then you will level up keep doing this until you get to the level you have to be and you will unlock it. PS keep practising and you will do it
No because they are diffrent files
Yes, you need to have online Xbox to level p in MW2. Easy to set up, but it costs $60 a year...
You have to be online, and the only way to unlock guns is to level up. Just keep leveling up and you will start unlocking guns, perks and new challenges.
You can play online using the Nintendo Wifi Connection. It allows up to 10 players per game.