What do flat Earthers think causes the "magical downward force"?

They don’t know - and not all of them agree that there is a “magical downward force”.

If (3) was the case - you’d have the same problems as (1) - but this weir...

2. Gravity does not exist - the Earth is accelerating upwards at 9.8 m/s2 which seems like gravity.

Opal Suchata Chuangsri from Thailand crowned Miss World 2025 - CNN

1. Gravity is real - but the Earth’s disk is very thick so the force is very nearly vertical.

The trouble with (1), (2) and (3) is that these cannot explain why the force of gravity varies with height above sea level…less at the tops of mountains - more in valleys.

If (2) was the case - then the acceleration would have to be EXACTLY the same everywhere - and it’s not.

Apple Has a Huge Siri Problem That WWDC 2025 Probably Won’t Fix - Gizmodo

If (1) was the case - the center of gravity of the Earth would have to be so deep down to avoid gravity pointing off at an angle when moving towards the “rim” of the flat earth that the difference in height of a mountain would be negligible and we would get very, very nearly the same gravity everywhere.

3. Gravity doesn’t exist - it’s a form of magnetism that works on non-metals.

I have heard them say:

Why did Cartman love Heidi purely with heart, her being the first one he ever did, but then one day Butters tells him that all women are manipulative and then he began to believe that she was a bad person and pretended to be a victim?

…and there are probably other ideas out there.

4. Gravity doesn’t exist - things are held down by air pressure.