Do two identical magnets have double the force (from one)?

Yes, as long as the magnets are attached ro the help object far away enough that the magnetic fields are not interacting with each other in a way that weakens the hold.

The key word here is mysterious.
Me too.

Meaning you too are mysterious or 2 of you exert twice the force?

Meaning I am mysterious, plus magnetism is mysterious to me.
So if that adds up to 2 you would be correct.

You can think of force as a vector. By Newton’s laws, the combined force of two separate forces is their vector sum. Two magnets pulling in the same direction have twice the force.

No. The keyword is “two” when they are stuck together N/S the field lines remain somewhat localized. Since they do not occupy the exact same space the result is a partial sum where the field lines overlap yielding a field strength that is not quite as strong as the sum of both but stronger than one.

DisCERN ibly less than two.

Magnetism is mysterious to me! It’s one of the driving forces in the universe, along with gravity.