Zombies was a mix of FPS and survival/horror. Balance between action and adventure to offer a varied experience to the player. Interactive use of the surroundings in order to survive in the besieged town : the player could have find objects to block paths, use electricity or gaz to forge a path to freedom. Find food and medication to save your skin and that of other survivors.
Beware the contamination… zombies attacks would have slowly turn you into one of them… See your body changing, becoming slow and clumsy, but also more resistant to bullets and other attacks. But would you have find a cure in time ? Find medi-kits, ingredients to a serum and use the sickness to your advantage. Find other survivors. Each would have bring new skills in medication, combat, electronics… and each one would have a different personnality and weaponry.
[Info from krysalide.fr]
[Contribute by Matt Gander from www.gamesasylum.com]