Solitaire is developed by MobilityWare, available for downloading on iOS and Android platforms. It is a mobile version of the classic Solitaire card game that players can enjoy anytime and anywhere on the go. Although there are many Solitaire variations and mobile games alike, this is the original one with a massive user base. The game app is free for downloads with in-app subscriptions providing even better gaming features and experience. Regardless, the core gameplay remains classic and familiar for most users who have played such card games alike. This online mobile version integrates both traditional Solitaire games as well as other attractive features. Apart from the default Solitaire (both draw-one and draw-three), players also get to participate in daily challenges to get a new and refreshing gaming experience out of the good-old game; what is more, players can also play offline with unlimited random challenges. Besides, thanks to its huge user base, this game is very interactive and gamers can stay active in the global Solitaire online community where they can join multiplayer competitions and climb up the leaderboard. Another appealing feature of the mobile version is that players can customize their gaming styles, such as the back of cards design and playing board patterns etc. Last but not least, the app allows players to keep on track of their own gaming stats by reviewing their performance history and progress, so that players can realistically get better at the game and notice their own playing patterns and styles. In this sense, this mobile game is trying to be a brain-trainer instead of being yet another solitaire game. Players can always challenge themselves and learn about their own gaming mechanism, which might bring some interesting intellectual rewards.