Rather than the familiar green that forms the background to most card games, we have dressed this Spider Solitaire game all in blue. Research shows that blue is the most restful colour for the eyes. The playing cards have also been made extra-large and are very clear. You can use the undo button as many times as you like. So, this version is strong on relaxing while you play and with 3 different difficulty levels you're sure to have hours of fun improving your score.