From the Project Manager you can modify the game parameters and access other editors.
Several games can be opened at once.

A blank game will open automatically when starting Game Develop. Otherwise, you can open a new game by clicking on the New button in the ribbon, or by pressing Ctrl-N. You can close a game by right-clicking on it in the Project Manager and choosing Close this project, or by pressing Ctrl-W. Right-clicking on an item in the Project Manager will activate a menu: from there you can modify other settings, like the game parameters or the global variables.

Once a game is open, you need to double-click on it to activate it. To save a game, use the Save icon in the ribbon or press Ctrl-S.

Double-click on Images to open the Image Bank.

A game is composed of scenes: the first scene in the list will be launched first.
To add a scene, right-click on Scenes and choose Add a scene. Double-click on a scene to modify it in the Scene Editor, or right-click it for more options.

External events are events which are not directly linked to a scene. They can be included to one or more scene using Link events.

To add an external event, right-click on External events and choose Add external events. To modify an external event, double-click on it, or right-click for more options.

Extensions allow to add, extend and simplify Game Develop creation capabilities. Double click on Extensions to choose the extensions to use in your project.