This is not a free apps. It is an evaluation version with 5,000 bet credits to play. The apps will expire when your total bet reach 5,000. If you like the apps, you can purchase the full version.
This is the "High Limits" Slot Machine. Max Jackpot up to 3,000,000 with max bet of 300 credits.
New release also support Android Tablets with any resolution.
Have fun with evaluation version "High Limits" machine.