12-13 de octubre: MW 3 beta Acceso anticipado para Xbox y PC + beta abierta para PlayStation. 14-16 de octubre: Beta abierta de MW3 en todas las plataformas. Los períodos beta comenzarán y finalizarán. a las 10 a. m. PT / 1 p. m. ET / 6 p. m. en el Reino Unido para las fechas correspondientes enumeradas anteriormente.
To redeem your MW3 beta code on PC, follow these steps: Open the Battle.net client on your PC. Log in to your Battle.net account or create a new one if you don't have an account yet. Go to the "Games" tab and click on "Redeem a Code." Enter your MW3 beta code in the provided field. Click "Redeem" to activate your code.
On Windows PC, where Modern Warfare 3 is available via Steam and Battle.net, campaign early access begins at 10 a.m. PT on Thursday, Nov. 2, according to an Activision blog post. (Update, Nov. 1
Yes, you enter your pre order code into the redeem section of COD website and it then gives you a 12 digit code for redeeming on PSN Store to get actual access to the beta early (before it goes Open on Sunday) I see you figured it out yourself but just replying anyway if anyone needs to know the process.
Hey, don’t know if this has been spotted/shared yet, but EE (UK company) are giving out free MW3 Beta codes with no need to pre-order the game. It is a UK company so not sure if it would work outside of the county, but otherwise seems legit.

In terms of content, the first Modern Warfare 3 beta weekend features a grand total of five maps. It begins with Favela, Estate and Skidrow, which are playable in a variety of classic multiplayer

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how to play mw3 beta on pc steam