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Whips, rimmer, massive massive whips.
Actually, this isn't that hard given enough slaves and beasts of burden like camels.
Each stone was 2.5 tons (5000lbs) on average and the average human male can pull 500 lbs easily. That means with decent friction elimination (rolling logs, water, sand etc.) it would only take 10 adult slaves and a horse to move each block.
The most interesting part to me is the rope strong enough to pull that kind of weight.
ropes together strong
Peep Show also has that joke - "Slaves, Jeremy" VS "Whips, Rimmer".
But there's a good chance that the answer wasn't slaves, but well paid, hard-drinking work-units, organized along the lines of boat crews, all working together during a public festival and overseen by well trained specialists.