2 decks. Easy. No redeal.
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Horizon Solitaire uses 104 cards (2 decks). You have 8 foundations and 8 tableau piles (with one card in each pile).
Kings are moved to the foundations as they become available.
The object of the game
To build the foundations down, regardless of suits, to aces.
You cannot move cards from one tableau pile to another. The top cards of tableau piles and the waste pile are available for play on the foundations.
Spaces in tableaus are filled automatically from the waste or stock piles.
When you have made all the moves initially available, begin turning over cards from the stock pile. You can move cards from the stock pile to the foundations according to the rules.
There is no redeal.