def actualiza_puntuacion(s)
		scores = Score.find(:all, :conditions => ["game_id = ?", self.id])
		game = Game.find_by_id(self.id)
		total = 0.0
		if s then total += s end

		for sc in scores do
			total += sc.score
		end

		if !(scores.length == 0) then
			if s
				total = total / (scores.length + 1)
			else
				total = total / scores.length
			end
		end
		game.total_score = total
		game.save
	end