I have a Nexus 7 2013 Edition 16 GB with android 5.0.2. Flashed, wiped with nexus root toolkit and rooted.

I can't play games that i downloaded from mobilism and has obb folder. I put the obb in Android/obb like i did at least a year then install apk an start the game then the game just close itself no error messages. Free or games that i bought like Sentinel 4 are working fine. Is this some new copy protection? I also installed modded google play.

What's the name of the game that you are having problems with? It could be that you have installed the mali or power GPU version rather than the THD Nvidia version.

Asphalt 8 Airborne v1.7.0k [Unlimited Everything & Unlocked] [M4Master][TeamOS-HKRG]
Epic War TD 2 v1.00 [Adreno]
N.O.V.A. 3 - Near Orbit Vanguard Alliance v1.0.8e
Reckless Racing 3 v1.1.3 apkmania.com
Shiny The Firefly v1.1.1
Need for Speed™ Most Wanted v1.0.50 [Mega Mod]

My GPU is Adreno. Everything was fine with android 5.0.1

Are you using a custom Rom? Or are you running on the stock Google Rom?

Stock. Also Defense Zone 2 HD is working and i downloaded from here and it has obb. Maybe ART is messing up games?

It's quite possible that some of the games need to be updated in order to run on your device, as the OS architecture of Lollipop may interfere with the code of the older games.

I updated the Google Play Services and rebooted the tablet but nothing changed. Heroes of Might & Magic 3 HD is also working so it must be some other games problem.

Sounds like it, I would wait for the developers to release a update later in the future.