2 decks. Easy. No redeal.
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Twenty Solitaire uses 104 cards (2 decks). You have 20 tableau piles with one card per pile and 8 foundations. At the start of the game an Ace and King of each suit is dealt on the foundations piles.
The object of the game
To build the foundation ases up in suit to kings, to build the foundation kings down in suit to aces.
The top cards of tableau piles are available for play on foundations. Spaces are filled automatically from the waste pile. You cannot move cards between tableau piles.
When you have made all the moves initially available, click on the stock pile to deal one card on each tableau pile. When the stock pile is empty spaces may be filled by the top cards of tableaus.
There is no redeal.