About Playground Mahjong GamePlayground Mahjong is a timed 25-stage Mahjong Solitaire game themed after recess time at school. Pair off identically matching open stones to remove them from the field and complete each stage before the timer runs out. Open stones have a light cream background color while other stones have a darker gray design. Selected open tiles have a blue highlight on them until they are matched off. Each pair you make is worth 100 points & you score 30 bonus points for each second you have remaining when you beat each stage. If you get stuck there are hint and shuffle buttons in the lower right. This is a JavaScript web application which uses cross-platform mobile-friendly HTML. All modern web browsers like Microsoft Edge, Apple Safari, Google Chrome, Mozilla Firefox and Opera should support it. This game works on just about any type of computing device including Microsoft Windows desktop computers, Apple OSX Mac computers, iOS powered tablets and phones like the iPad and iPhone, laptops like the Google Chromebook, and the many types of mobile phones from manufacturers like Samsung which are powered by Google Android.