Tech giant is holding a tournament to celebrate Solitaire's 25 year anniversary

Microsoft ever-present game is turning 25, and the tech company is celebrating that with a large global tournament to find the best payers.

The tournament begins with a competition among all Microsoft employees.  "Then, starting Monday, June 5, Microsoft winners will go head-to-head with public players in a 25th Anniversary Tournament hosted within the game," says Microsoft.

All five versions of the game are available on Windows and Windows Phone.

Microsoft may also be using the tournament to further improve the games visibility in preparation for the Windows 10 launch.

While Windows 8.1 users have to download the apps from the Windows Store, Microsoft’s classic card game will be baked into the new operating system once again, as Windows 10 launches later in the year.