I've got an idea of something helpful that could be implemented into Endless zones  We know by now that lawn mowers can allow us to win really difficult levels, and it really sucks when we end up losing one. So on the screen when we need to choose a card, and we're missing at least 1 lawn mower, the face-down card will occasionally allow us to replace one we've already lost. And since the "free face-down" glitch was removed, it makes it more well worth paying for that 4th card.