Like Payday 2 but with zombies (techincally clones, not zombies) called Zeds that are not just bullet sponges. The thing I also like is that the AI also gets smarter as you go up in difficulty. Zeds will develop new movement patterns, they will come at you faster, try and dodge your shots, and develop new attacks. ( For example, an enemy called the Husk is a Zed that shoots fire balls, and on a certain difficulty, if you get too close to him he will spew fire at you, like a flame thrower.) Also the game is made in an engine that performs well even on low end systems. And even when playing on the low preset, the game still looks good compared to Payday which smudges the textures to a total blur.

HIGHLY RECOMMENDED IF YOU LIKE PAYDAY 2