Memory: As an examiner, I want to be suprised with one additional feature

The Memory sub-app should be extended with at least one additional custom feature. You are free to choose whatever you like. Some examples:

• An additional timer to show the total time a game took to finish
• Highscore to show top players
• Play online with another player or offline between two players in separate windows

To make sure that the feature is noticed by the examination, please make a comment next to this Issue in the Issulist in the submission report. Comment short like: "Higscore based on the time"