You mean on ACR? Not everybody plays on ACR, and i think its their invention.
Well this mode is alot of fun. I just shove it in with some high cards and steal blinds. Well it really is just like a very late stage of the game, so you must keep an eye on blinds. Nothing too complicated.
You have to play with time on some pots , so as to avoid paying or playing the blinds , which in the 3 minutes increased blinds time period are very high and this hurts your stack , especially in later blind levels . Apparently in the 2 last levels before the normal game begins , you won't be able not to pay the blinds , only if you are removed to another table last hand before the blinds .