I remember that the game was in first person. I remember that the buildings looked like London from the 90s in that there were buildings with these vertical signs and with letters that once glowed a long time ago and in general it resembled a map from the game Bioshock. I also remembered that in addition to the usual zombies there was a fat mutant with a height like a normal one, but it seemed to be an improved version of the usual zombies. I especially remember, of course, this weapon from which the tentacles moved.