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 clubs on ten hearts.
You can put any cards into the empty cells. You cannot collect stacks in auxiliary cells. Cards can be dragged either one at a time or in whole stacks if they are folded correctly. You need to collect complete sequences from aces to call-roles in the upper right corner.
Also from there you can return cards back to piles or to free cells.
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