Left 4 Blox

It's a typical zombie game where you shoot zombies. Special zombies appear when a player dies, turning them into a special zombie. There are also bot zombies, which are just bots that follow survivors and deal damage. Special zombies are fun, and there's also a mutant called Tank. There are various types of special zombies, and the quality isn't bad. There are also many utilities and secondary weapons, so I recommend giving it a try. It might lag on mobile.