CreeHack - Great application for hacking many different games on android. Most notably, it does not require root access rights, which are so afraid of getting a lot of users. Of course, this application can not hack any game, but developers are constantly working on this issue and raise the quality of the application as a whole. Managing the application is pretty simple, you just need to run it and then go ahead with the purchase as in a regular gaming store, and if the game is supported, then you immediately credited that game currency.
A good anti-virus for Android from the developer IKARUS Security Software, will provide reliable protection of your smartphone.