I downloaded this app as part of a tapjoy rewards program, for currency in another app. After downloading it, through all the links in said app, and accomplishing the tasks set, AND waiting the 24 hours after, (as opposed to the standard 1 hour)- the Solitaire people/ company claimed I had not downloaded it through the (only) app I used to access it, and refuse to acknowledge their end of the deal. Tl;Dr they didn't attribute the download correctly and thus won't honor their contract.