Dead Pixels (Steam key/Region free).

http://store.steampowered.com/app/222980/
A toxic waste spill finds its way into the water supply, causing the recently deceased to rise from their graves. Now it´s up to you to blast your way through the hordes of undead if you´re going to escape the city. On the way to your rescue, you´ll search stores and houses for supplies, and trade with other survivors.


With three game modes, hundreds of items, weapons and grenades, and a city that is never the same twice, there is always something new hiding round the corner in Dead Pixels.


When the Dead Start Walking, It´s Time to Run.
Key Features:
Over 100 weapons, grenades and items
A procedurally generated city, that´s different every time you play
3 different modes of play
4 different difficulty modes
Single player and two player local co-op
Online leaderboards
30 achievements