A small GameMaker project can survive a little disorder. You might keep movement code inside one object, name a sprite sprite7, and place every asset in the same folder.
As long as the game contains only one room and a few objects, you can probably remember where everything is. That approach becomes painful once the project grows.
A larger game may contain hundreds of sprites, enemies, scripts, rooms, sounds, interface elements, and gameplay systems. Without a clear structure, simple changes can produce unexpected bugs in completely different parts of the game.
Learning how to structure a large GameMaker project is therefore not just about making the Asset Browser look tidy. Good organisation helps you find code faster, reuse systems, collaborate with other developers, test features independently, and safely change the game later.
The ideal structure depends on your genre and team, but several principles work across most projects: use consistent names, organise assets around clear systems, keep code modular, limit object responsibilities, and use source control from the beginning.
Organise the Project Around Clear Systems
Before creating dozens of folders, think about the major systems in your game. A typical action game might contain player controls, enemies, combat, inventory, dialogue, menus, audio, saving, levels, and visual effects.
These systems can become the foundation of your project structure. Instead of throwing every object into one folder, group related assets together:
Player
Sprites
Objects
Animations
Enemies
Common
Slime
Archer
Bosses
Systems
Combat
Inventory
Dialogue
Saving
UI
Menus
HUD
Fonts
World
Rooms
Tilesets
Props
GameMaker’s Asset Browser supports custom folder groups. The official manual notes that assets can be arranged by type, by level, or through any structure that suits the project.
Neither type-based nor feature-based organisation is automatically correct. A small team may prefer keeping all assets for one enemy together, while another team may want every sprite in one central sprite folder.
Choose a pattern that helps you answer one question quickly: “Where would I expect this asset to be?”
Create a Consistent Naming Convention
Naming conventions make project assets readable without opening them. Prefixes are especially useful in GameMaker because many asset types can appear together in code completion and search results.
A practical convention might look like this:
obj_player
obj_enemy_slime
spr_player_idle
spr_player_run
snd_player_hurt
rm_forest_01
fnt_dialogue
seq_intro
Variables and functions should also describe their purpose:
move_speed = 4;
current_health = 80;
maximum_health = 100;
function player_take_damage(_amount)
{
// Damage logic
}
Avoid names such as value, thing, new_object, or script2. They may seem harmless today, but their meaning becomes difficult to remember after several months.
Use the same vocabulary throughout the project. If you call the player’s current health hp, do not call it health, life, and player_hp in different systems unless those values genuinely represent different concepts.
Consistency is more important than choosing the perfect convention. Write down the naming rules in a project note so every team member follows the same pattern.
Keep Objects Focused on One Responsibility
An object becomes difficult to maintain when it controls movement, combat, inventory, dialogue, saving, animation, music, and menu logic at the same time.
Try to give each important object one primary responsibility. The player object can coordinate player-specific behaviour, but reusable systems should be separated into functions, structs, components, or controller objects.
For example, instead of placing a complete inventory implementation inside obj_player, the player could store an inventory struct:
inventory = new Inventory();
The inventory struct then manages adding, removing, and checking items:
function Inventory() constructor
{
items = [];
add_item = function(_item)
{
array_push(items, _item);
};
}
This separation makes the inventory easier to test and reuse. A shop, storage chest, or enemy loot container could use the same underlying system.
Avoid splitting every tiny action into a separate object, however. Too much separation can make a simple feature harder to follow. Create a new system when the code has a clear responsibility, is reused, or is becoming difficult to manage inside its current location.
Move Reusable Logic into Script Functions
Script assets are useful for storing functions that are called from several objects or systems. GameMaker’s documentation recommends script functions for reusable and modular blocks of code, allowing one change to update every place that calls the function.
Related functions can be grouped by purpose:
scr_collision_functions
scr_inventory_functions
scr_save_functions
scr_math_helpers
scr_ui_functions
Inside a script asset, you might define:
function approach(_value, _target, _amount)
{
if (_value < _target)
{
return min(_value + _amount, _target);
}
return max(_value - _amount, _target);
}
This function can then be called from movement, camera, animation, or interface code.
Do not create one enormous script containing every function in the game. Smaller, clearly named files make navigation and code review easier.
It is also useful to understand the difference between script functions and methods. Script functions are suitable for globally reusable behaviour, while methods can be bound to a particular instance or struct and operate within that scope.
Use Parent Objects Without Building Deep Hierarchies
Parent objects allow several child objects to share events and be treated as one category. For example, obj_enemy_parent could act as the parent of slimes, archers, flying enemies, and bosses.
GameMaker object inheritance lets child objects share code and events with their parent. Checks performed against the parent can also include its children, which is useful for collisions and broad object categories.
A projectile could therefore check against one enemy parent:
var _target = instance_place(x, y, obj_enemy_parent);
if (_target != noone)
{
_target.take_damage(damage);
}
This is cleaner than checking every enemy type separately.
Child objects can override inherited events when they need unique behaviour. When a child must run the parent event and then add more code, call:
event_inherited();
The function executes the inherited parent event before continuing with the child’s additional instructions.
Keep inheritance chains shallow. A hierarchy with many levels can make it difficult to determine which event or variable controls the final behaviour. Parents work best for broad shared categories, not as a replacement for every other form of code reuse.
Create Dedicated Managers for Global Systems
Some systems exist beyond a single room or character. Music, saving, settings, game state, achievements, and room transitions may need dedicated controller objects.
Examples include:
obj_game_manager
obj_audio_manager
obj_save_manager
obj_ui_manager
A game manager might store the current difficulty, player progress, and active game state. An audio manager could control music transitions and volume settings.
Make a controller persistent only when it genuinely needs to survive room changes:
persistent = true;
Persistent managers should also protect against accidental duplication. A simple Create Event check can ensure that only one instance exists:
if (instance_number(object_index) > 1)
{
instance_destroy();
exit;
}
Do not turn obj_game_manager into a dumping ground for unrelated code. Once a manager begins handling music, saving, enemies, interface animation, and combat, divide those responsibilities into smaller systems.
Rooms also need deliberate organisation. GameMaker’s Room Manager controls room order and identifies the starting room, while room assets can still be organised into Asset Browser groups.
A larger project might separate rooms into boot, menus, levels, cutscenes, and testing areas.
Use Source Control, Documentation, and Regular Refactoring
Large projects change constantly. Source control records those changes so you can review earlier versions, restore broken files, and collaborate without manually passing project folders around.
GameMaker provides source-control integration based on Git, although Git must be installed and configured separately. The official documentation recommends understanding basic source-control concepts before enabling the workflow.
Make small, meaningful commits:
Add player dash cooldown
Fix inventory item duplication
Create forest enemy parent
Refactor music transition system
A message such as updated stuff is much less useful when you need to find the change that introduced a bug.
Source control is not a substitute for backups, but it gives you a reliable history of the project. Commit working stages before performing a major refactor.
Documentation should also live close to the project. Record naming rules, controller responsibilities, important data structures, room flow, and setup instructions.
GameMaker supports Note assets, which can be used for project documentation directly in the Asset Browser.
Finally, refactor gradually. When a file becomes difficult to understand, improve it before adding another large feature. Rename unclear variables, extract repeated code, remove unused assets, and break overly large systems into focused parts.
A well-structured GameMaker project is easier to build, debug, expand, and share. Organise assets around clear systems, use predictable names, keep objects focused, and move reusable logic into script functions or structs.
Parent objects can simplify shared behaviour, while dedicated managers help control systems that continue across rooms. Git, documentation, and regular refactoring protect the project as it becomes larger and more complicated.
Do not wait until the game contains hundreds of assets before organising it. Create a basic folder structure, naming guide, and source-control repository at the beginning.
Then review the structure whenever a new feature feels difficult to place. A few minutes of organisation today can prevent hours of confusion later.