When Zombies Rise

Two zombie tales in Zombie Games and the Zombie Diaries. 
Zombie Games - In a post-apocalyptic world, all of the zombies have been captured and are now used for research...and sport... 

Andrew and Leanne are part of a group of thrill-seekers who pay to enter a labyrinth where they can kill zombies in a controlled atmosphere...But when the wall housing the rest of the zombie horde breaks, the group is forced to fight for their own survival. 
The Zombie Diaries - A slow burn horror story as a history professor recalls a time when his town was first invaded by zombies...in the middle of his lecture, however, the small college town is once again invaded by zombies as he and his students fight to survive.