I told myself not to post this thread because it's silly... but er, did it anyway. Imagine a game inside a tubular spaceship, where "circular" gravity pushes all characters to its interior floor. I am trying to do this as simply as possible because the game needs to have hundreds of characters; simple enemies without complex AI though. If the ship were a sphere I could create an object in the middle and run AddExplosionForce from it in Update... but it's not. Would also be good if the tube could bend, but not essential. I have already disabled normal Unity gravity!