Help with custom ROMs

Hey guys. So I have the Samsung Galaxy S Duos 2 (GT-S7582 model) and the default android version of the stock ROM is 4.2.2. On this phone there are currently no updates for android versions, so I decided to flash a custom ROM to update it. That is mainly because I want to play some games that need better than 4.2.2 version. So i flashed a ROM based on the stock ROM 4.2.2 and updated it to 5.0.2. The problem is that even know, I can't play the games that I am supposed to be able to play on this android version.. What's the problem? What do I need to do in order to be able to play the games I want?

This ROM I flashed is: Lollipop Extreme Build V2.