Most Survival Horror games consist of you, your gun, absurdly copious amounts ammo, and a plague of zombies. Or ghosts. But the point is, you have a gun, or at the very least a crowbar or something. Clock Tower doesn't work like that. With the exception of a few sequences in the third and fourth games, your character is an utterly helpless girl going up against an unstoppable creature bent on killing you. In short, a slasher movie turned video game. Not to be confused with the trope, Clock Tower.