1 deck. Average. No redeal.
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Citadel Solitaire uses one deck (52 cards). You have 4 foundations. You also have 8 tableau piles with 6 cards in each pile.
Aces and the newly-turned cards are placed in the foundation piles in the course of dealing.
Cards are dealt to tableaus by columns. Whenever a card is put on a foundation the next row is skipped. So the completed rows don't have the same length.
The object of the game
To build the foundations up in suit to kings.
The top cards of tableau piles are available to play. You can build tableau piles down regardless of suit. You can move only one card at a time.
When any tableaus are empty you can fill the space with any card.
The rules state that you can move only one card at a time. But as a shortcut, BVS Solitaire will allow you to move a full or partial build if there are enough empty tableau piles, because you would have been able to get the same result by temporarily moving the extra cards into the empty tableaus.