One of the most-played game of all times "Solitaire" is now available on iOS and android. "Microsoft Solitaire Collection" offers five of the best Solitaire card games - Klondike, Spider, FreeCell, Pyramid, and Tripeaks - all in one app. The game also includes Daily Challenges, where the gamer can play guaranteed solvable challenges every day in all five game modes with multiple levels of difficulty and earn awards.