There is an abundance of proof the ancient builders were crews with power tools using stargate doors to make game props, for biological robots. Smiths.

For game play. Like the Wizard of Oz. Get me the head of the neighboring chief and it is game on.
So clear proof of time travel.
In the cylinder seals of the middle east.

First here is one of the stargate doors now broken due to breaches of the quarantine...
https://images.app.goo.gl/92hwg7MzfqnkstZN8
Where did the door go?
Into the hollow moon which is a Dyson sphere teraformed inside it is the land of Oz.
https://images.app.goo.gl/AQ2YLUSeebT8rV8c7

So here are the limitations and restrictions on that stargate door.

No survival games on the other side of the stargate. A quarantine.
https://images.app.goo.gl/Jij5YQbYMxkUVWEq5
No scorpions
https://images.app.goo.gl/zu9i1Wf1ddwaP4go6
No cops and robbers
https://images.app.goo.gl/XJvqcSHsGZFsRtpj9
No cowboys and indians
https://ibb.co/Sf60K27
And notice no trick riding.

Why no trick riding?
That should be obvious...

https://youtu.be/gML_EDiOtSY

Don't say I never tell you anything.