Pygame – Issues creating projectiles, “add() argument after * must be an iterable, not int”

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The issue is not the pygame.sprite.Group.add operation, but the obejct you want to add is not a pygame.sprite.Sprite object, because the object is not constructed at all.
You missed to the super call in the constructor of Projectile. Furthermore the name of the constructor has to be __init__ rather _init_:

class Projectile(pygame.sprite.Sprite):
    #Initialize values
    def __init__(self,x,y,direction):
        super.__init__()
        self.x = x
        self.y = y
        self.dir = direction
        self.ttl = 30

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