On each card in the stack you can put another one, but of the opposite color and one less in rank. For example, you can put nine of clubs on ten of hearts.
You can put any cards into the emptied cells. You cannot collect stacks in auxiliary cells. Cards can be dragged either one at a time or in whole stacks if they are arranged correctly. You need to collect complete sequences from aces to kings in the upper right corner.
You can also return cards from there back to the piles or to the free cells.
Pro? Record a master class and get V.I.P.