“RTGame” explains with animation (10 min), “Designing a Roller Coaster that Literally Just Kills You, in Planet Coaster”.
That's a game that ends in carnage.
There is also a video by Brew, "Designing a Roller Coaster that Literally Just Kills You". (4 min)
It is a series of loop-d-loops that keeps you at 10G for one minute.
How about designing one that is a Mobius strip? It would have to be self-propelled. The picture above, of the green and yellow strip, shows one. Try taking a toy car and manually "driving" it around the loop. It's interesting.
No social distancing needed.