Variables

Game Creator comes with a variables system that allows you to keep track of the game progress and save the state between play sessions.
A variable is a value container with information that can be changed during gameplay.
For example, in a Zelda game, the hearts at the top of the screen would be a variable identified by the name "hearts".
(You can track the Player health creating an integer variable called "hearts")
There are different types of Variables:
​Global Variables: Identified by a unique name.
​Local Variables: identified by a unique name. Only affect one scene.
​List Variables: An array of values accessed by index. Only affect one scene.
Variables can also be accessed through code. Head to Variables Access to know more.
Anatomy of a Variable
A variable is has a name that identifies it (for example: “shotgun ammo“) and a value. 
A variable can have different types of values, including character strings, numbers, booleans (on/off), Colors, Vector3, and references to Game Objects.
Next to the name there's a checkbox. This allows to save the variable's state between play sessions
Not all variable types allow to save its state. For example, Game Objects can't be saved because they are a reference type, which Unity doesn't allow to serialize.

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Global Variables

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Anatomy of a Variable