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Putting a blog or other content on your website that is marketing focused to complement the content that is primarily meant for your business or customers is a good idea. This type of content allows one to drive new traffic, to get links in, or  to get social shares. It would be good to keep  it on the same domain and to use subfolders. Like footballgames.com/blog or footballgames.com/articles. But you do have to avoid stuff that might make your blog appear manipulative for SEO purposes. Try to link  across intelligently from your blog to your business content and vise versa. Don't have anchor text rich links on  every page of your blog linking over to the business pages. Optimize the blog to be helpful to visitors not just for the benefit of the crawler. A blog should try to entertain, educate, and build  trust with your audience so that one can improving the site's browse rate and get people to look at more pages. Hope this helps.

I myself would go at like this: Have a branded domain, which has all the apps in a list and some content about each with a link going to either a sub-folder or a sub-domain (I would choose sub-folder). I would add as much useful content as possible along with social sharing tools to each app page with the title tag like: Free Football Game, App name | Company Name or something like that. Keep it all under one roof, that is what I would do, others may do it differently.