1 deck. Easy. No redeal.
Barrier Solitaire uses 52 cards. You have 6 vertical tableau piles with 6 cards per pile, with the first, third, and fifth rows face up. You also have 16 open cards to the right of the vertical piles - the reserve.
Any Aces from the top of tableau piles and from the reserve are placed on the foundations.
All top cards of the tableau piles and all the reserve pile cards are available to play. You can move cards from one tableau pile to another one and from the reserve to tableau pile. The rule is as follows: you should place cards in the order of the highest to the lowest, regardless of suit. You can move either a single card or a set of cards.
When one of the piles is empty you can place there any single card available to play or set of cards.