It is said that at Mangalagiri Temple, god is self-existent. In the temple, there will be no statue of the god, but there is only mouth, widely opened to 15 cms. The mouth is covered by metal face of the god. The temple will be opened till afternoon only, with the belief that devatas will perform pujas in the night. The God takes jaggery water as offering by a conch.
The Jaggery water is actually poured into the mouth of the Lord, a gargling sound is clearly audible as if the Lord is actually drinking it and the sound becomes shriller and shriller as and when the Lord is drinking. The sound will come to a stop after sometime and the balance of the jaggery water is thrown out. This phenomenon happens not once in a day but is a recurring feature during the course of the day as and when devotees offer panakam (jaggery water).
It will be interesting to note that even a single ant is not traceable near the Lord nor around the temple in spite of the offering of so much jaggery water. As the offering of the panakam to the Lord is peculiar, the Lord here is called panakala Narasimhaswamy. There is a legend about the offering of the panakam (jaggery water) to the Lord. It is said that the hill was once a volcano. Sugar or jaggery water, it is said, neutralizes sulphur compounds found in a volcano and prevents a volcanic eruption.
Behind the temple there is the temple of Sri Lakshmi, to the west of which there is a natural cave. It is believed that it will lead to Undavalli caves on the banks of the Krishna river and the sages used to go to take bath in Krishna River. Now, the cave is very dark and the way could not be seen. We can reach the temple through steps-way on foot and also by road-way. The steps to the temple were constructed by Sri Channapragada Balarama Dasu in 1890. In 2004, ghat road had been constructed through which the pilgrims can reach the temple easily.