Why for free? Because steam engines are a special subject above all for fans we do not expect a lot of sales per day. Therefore we use the steam engines as a possibility to solicit our other Super Trumps games by offering it for free. We’re hoping that a lot of new customers are curious enough to load the app and recognize our others.
So get your copy now within Apple’s App Store and try the gameplay which will remind you of your childhood (at least in Europe, where Go Fish games are very popular as card games): iTunes link.