Many of the so called "Free Games" we play on our Idevices are made to be difficult, and for good reason. The game designers want you to make purchases for coins, or assistive aids to make the game easier. These aids can be quite costly. A friend of mine spent over $100 buying hammers, and level ups on a popular game called Candy Crush. I Jailbroke his device with the Evasi0n jailbreak, and setup a cydia tweak that allowed him to het all purchases for free. This method only supports DNS server games. It may work for your favorite Idevices games, you'll just have to test this method out and see.
This video Is the best current way to hack Candy Crush and many other popular Idevices titles.
If you have any questions or comments. Please feel free to comment on the video. I'm responding to questions fairly quickly their. Thanks for watching.