Counter-Strike is known as one of the most famous FPS shooting games. This game was first released on the Windows platform since 1999 when no smart devices appeared. Moreover, it is also a leading game in the FPS shooting genre and has become an endless source of ideas for later games such as Half-Life, CrossFire and another mobile game, Modern Strike Online. It can be said that Modern Strike Online inherits most of the features to the Counter-Strike graphic structure, allowing you to experience on mobile devices. In this article, we will learn about some of its main features and game modes.