Spider Solitaire – two suits
Medium spider solitaire with spades and hearts. You may place a card on any suit one rank higher, but you can move a run only when it is a single suit.
What two suits change
A mixed column will not move as a stack. You have to take it apart first. Building in one suit is worth more than covering a card quickly with the other color.
An empty column is more valuable than in one-suit: park the card that is locking a bad run.