I have purchased a few games that require fairly large files to be downloaded. Quite a few of them exceed 1Gb. I seemed to have run out of storage on my 32Gb Nexus. I really dont want to admit defeat here and settle without installing the rest of my purchased games. So, I'm trying to clean up my sdcard storage manually. There is a folder /sdcard/obb that contains the downloaded files for the games. To my understanding, these are packed binary files that are extracted when the game is installed after download. Are these files still required? Unfortunately they are not even removed when the game is uninstalled, so they must be removed manually.