brand tags battle mode

This has been floating around in my head for a while and I decided to finally make it happen. In this new brand tags game, two random brands are pitted against each other (hence the name battle mode). It actually ends up being a lot of fun, especially because you find yourself coming up with funny ways to compare two random logos (and I kept coming up with explanations in my head for why they're not really random at all). Also just added the ability to mark a matchup as favorite and add comments. Give it a try.