Variables in GML hold data. Depending on where you need to access that data, you will use one of four scopes:
The "blueprints" for everything in your game (players, enemies, walls).
Once you have the engine open, the next step is understanding the "grammar" of GML. Writing great code is about more than just making things work; it's about clarity, efficiency, and maintainability.
These additions do not mean GML is being abandoned. Rather, GameMaker is expanding its language ecosystem, allowing developers to choose the right tool for each job. Beginners can continue using GML, while experienced programmers can replace any script with JavaScript or TypeScript.
To make your player shoot towards the mouse cursor, utilize the instance_create_layer function. gamemaker studio 2 gml
: Receives monthly updates and new feature rollouts. Learning Curve
You can create any mechanic you can think of.
: Accessible across any object in any room, declared using the global prefix or a globalvar declaration (e.g., global.player_score = 0; ). Conditional Statements GML handles logic through standard conditional blocks:
inventory = ["Sword", "Shield", "Potion"]; show_debug_message(inventory[0]); // Outputs: Sword Use code with caution. Conditionals (If/Else) Variables in GML hold data
/// @function draw_deep_paper(x, y, depth, facing_angle, sprite_index, image_index) /// @description Draws a "deep" paper effect with simulated 3D thickness. /// @param real _x The x position to draw at. /// @param real _y The y position to draw at. /// @param real _depth The pixel thickness of the paper. /// @param real _angle The angle of the paper (0 = upright, rotates clockwise). /// @param sprite _sprite The sprite to use for the top surface. /// @param real _frame The frame index of the sprite.
Use an underscore (e.g., _speed ) for local variables to instantly distinguish them from instance variables.
Learning to type GML code gives you full control. It is a simple language to learn. It looks a lot like other popular languages such as JavaScript and C#. If you learn GML, you will find it easier to learn other coding languages later. Why You Should Learn GML
You can declare custom functions directly in script assets or assign functions to variables inside objects using the function keyword: Writing great code is about more than just
: Handles visual rendering. If you write GML in the Draw Event, it overrides GameMaker’s automatic sprite drawing, meaning you must manually call draw_self(); to display the assigned sprite.
GML also supports various control structures, such as:
var _item = name : "Iron Sword", damage : 15, value : 50 ; Use code with caution. Method Variables and Functions
Understanding scope is crucial for avoiding naming conflicts and ensuring that variables are available where needed.
Control structures look identical to JavaScript or C-style languages.
GML is the key that unlocks the true potential of GameMaker. By taking the time to learn the language, you shift from being someone who uses an engine to someone who truly commands it. The logic, architecture, and problem-solving skills you build by writing GML will serve you for your entire game development journey.