The unique feature of these Spider games is that More Cards will deal a card to each NON-EMPTY column. This small change in rules allows you more flexibility and hence more strategy.
Both games are free-to-play. No in-app purchases.
MAKE RUNS - Make complete runs (King to Ace) in-suit and the run will be removed from play (like Spider).
FOUNDATION - Build the suited foundations from Ace to King (like Klondike).