Concrete Software has just released Aces Solitaire Pack 2 for Android. It offers tons of great features that set it apart from other mobile solitaire games. The most notable features are the number of games included, number of options for customization, and the online leaderboards. The new game offers 40 different solitaire games including Klondike, Pyramid, Spider, Free Cell and many more unique titles while the online leaderboards add a sense of community between players. It is available on the Android Market. Check it out!