First, enter dekstop mode. Search the Punkbuster site on firefox and download the exe for windows, add it as a non-Steam game, force Proton compatibility (use the latest version available) and update the BF3 exe. This is essential, otherwise when you try to join a server, the game will kick you out. After that, download the "User Agent Switcher" Firefox extension. (I recommend looking for the "PC Gaming.it" video relating to Battlefield 3 on Youtube, since in the description of the video there are both programs you will need.) Now add FireFox as a non-Steam game, this will be very important for playing . Now the final part: enter game mode, start firefox and log into the battlelog, select what you want (campaign, multiplayer) but don't click on it, start Battlefield 3 but don't close Firefox and wait for it to send you back to the game's internal browser ( the one that asks you to use the touch to be clear) once you get to the battlelog page, go back to firefox and select what you want from there. Done, now the game launches without problems. The game has controller support, but it doesn't have aim assist, so in multiplayer you will struggle a bit at first, but once you get used to it there will be no escape for anyone lol

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