The Game Launcher is designed to bring better gaming experience on Galaxy phones. It is said to be the HQ for all your games. It automatically adds all games you have on the phone as well as all future game download to the center. It means you can easily find all games installed on your device.
The Game Tools lets you record gameplay and share it with other users. Also, it locks all capacitive touch keys and blocks all notification sounds, so that these will not disturbing you when playing games. Both features are quite useful for those who love playing lot of games on their phone. The following instructions are meant to guide on the installation of the Samsung Game Launcher and Game Tools on Galaxy S6 and Galaxy Note 5. First, download and install the Game Launcher from Samsung App store [HERE], then you need to install the Game Tools from within the Game Launcher. Once installed, restart your handset and your Game launcher and Game Tool are ready to use. (source)