Earn Coins

This part of the shop allows you to get some coins in exchange for doing simple tasks such as liking the game publisher in facebook , or to follow them in twitter.

It's a personal choice as to whether or not you want to do this - you don't actually get that many coins for doing it, so it's not something I have done.

Free Keys

But the really good thing about this section is that currently there is an option to watch a 15 second movie clip/advertisement in exchange for two keys. This is limited to one per day. It's a really good way of stocking up on keys in just watching a clip. So far all the clips I've seen have been related to other video games, so they have, so far, been very relevant.