Deuces is a double-deck game with an interesting layout. Wins are frequent, and the strategy isn’t deep. Aces are ranked high (above Kings) which is unusual because in most solitaire games Aces rank low, below the deuces (twos).
Tableaus build down, also following suit, also with Aces high (so that you may play a King on top of an Ace).
The top card of each tableau and the discard pile is available for play onto tableaus or foundations. In addition, entire tableau piles may be picked up and moved onto another tableau pile.
An empty tableau must be filled immediately with the top card from the discard pile or (if the discard pile is empty) from the deck. Solitaire Till Dawn X will do this for you automatically.
In any game like Deuces, where disordered cards pile up in a discard pile, it’s crucial to keep that pile as small as possible. You do this by finding other places — almost any other place — to put those cards. In Deuces, the only “other places” are the foundation and tableau piles. It’s therefore important to empty out tableau piles as often as possible, because an empty tableau is immediately filled from the discard pile. In practice, this means that if you can move cards from the tableaus to the foundations, and you have any choice about which ones to move, you should always move the ones that will empty out the most tableau piles.