You have to attach all cards to the piles on the bottom, in a descending order and with alternating colors. Achieving that is not that simple, however. The goal is simple: you have to move all existing cards onto the four foundation piles. Solitaire is as simple as it is addicting. Solitaire Classic - a highly addictive Klondike card game for everyone! Solitaire Classic is the perfect card game for every fan of the retro computer game classic and one of the best known and most fun single-player card games of all times.