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How did people reach the upper levels of Mesopotamian ziggurats?

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The Great Ziggurat of Ur in Iraq, a massive ancient brick structure with broad staircases and terraced levels, stands alone in a barren landscape. — Mesopotamian art and architecture Ziggurat at Ur (modern Tall al-Muqayyar, Iraq), constructed c. 2100 bce.

People reached the upper levels of Mesopotamian ziggurats primarily via an exterior triple stairway or by a spiral ramp.1

For example, the ziggurat at Ur featured three buttressed staircases that led to a temple situated on the flat surface at the top. However, it is important to note that for nearly half of the known ziggurats, no specific means of ascent has been discovered by archaeologists.21