Level Builder

The Level Builder is one of the main features of Mega Man Maker. Using the Level Builder, a user can create their own levels, save them as .MMLV level files, and share them with others. Players are also able to collaborate together over the internet in real time to build levels together using the Build Online feature of the Level Builder. Levels can be shared either by sending .MMLV files to others or by using the Online features to upload a level to Mega Man Maker's online server (after a play test to verify it is possible to complete) and shared with others.

Assets

The assets included in the Level Builder as of 1.8.0 include the following:
4 Playable Characters
60 Bosses
229 Enemies
166 Level Objects
16 Pickups
714 Backgrounds
684 Tilesets
210 Ladders
233 Spikes
37 Waters
8 Lavas
9 Special Objects
100 Weapons (including each character's Buster)
16 Utility Weapons (including each character's exclusive utility weapons)
183 stage Music tracks (official games, 8-bit recreations, and original remixes)
1000 Screens of building space (50 horizontal screens by 20 vertical screens)

Editor Toolbars

The Level Builder contains three different toolbars, each with different sets of tools and features.

Top Toolbar

This toolbar is focused on assets that can be placed within a created level.

Icon	Tool	Description
	Weapons	Button brings user to menu where they can select the usable weapons within the created level.
	Music	Button brings user to menu where they can select the music that will play within the created level, and listen to previews of each level music.
	Backgrounds	Button brings user to menu where they can select the backgrounds used for specific screens within the created level.
	Tilesets	Button brings user to menu where they can select the tiles to place within the created level.
	Characters	Button brings user to menu where they can select the starting spawn point and starting character for the created level.
	Enemies	Button brings user to menu where they can select enemies to place within the created level.
	Level Objects	Button brings user to menu where they can select level objects to place within the created level.
	Pickups	Button brings user to menu where they can select pickups and pickup spawners to place within the created level.
	Bosses	Button brings user to menu where they can select bosses, boss associated assets, and level ending assets to place within the created level.

These both appear in each of the assets menus associated to the Top Toolbar.

Recents: Shows a listing of the last ten assets selected by the user.
Favorites: Shows a listing of the ten or less favorite assets selected by the user. They can be added, removed, or re-arranged as the user desires.

Bottom Toolbar

This toolbar contains other useful tools unrelated to placing assets.

Icon	Tool	Description
	Music (Simplified)	Button brings the user to a simplified version the Music menu, with only buttons for play/pause, next song, and previous song.
File:BTB Icon QuickTools.png	Quick Tools	Button allows the user to choose between several drawing methods: they can either draw freely, draw a rectangle or draw an outline.
	Test Play	Button allows user to test play their created level. Complete the level, exit the level, or press P or ESC to return to the Level Builder.
	Grid Toggle	Button toggles the ability or inability to see the tile grid in the Level Builder.
	Find Spawn Point	Button moves to the screen where the player's spawn point is placed, if one exists in the created level. If a spawn point does not exist within the created level, pressing the button will do nothing.
	Move Screen	Button toggles the ability or inability to move between screens by holding the left mouse button in, and dragging the mouse across the screen. Assets can not be placed while this feature is in use.
	Map Toggle	Button toggles the ability or inability to see a map of all 1000 screens in the Level Builder.
	User Interface Toggle	Button toggles the ability or inability to see the various buttons and toolbars associated to the Level Builder. When the feature is disabled, moving the mouse to the far top or far bottom of the screen will cause the associated toolbars to re-appear until the mouse is moved away.
	Clock	States the current time, as set by the user's time settings on their computer.

Orange Button Toolbar

Contains all other tools that don't fit into the two prior two toolbars.

Icon	Tool	Description
	Button Shortcuts	Button gives the user a listing of all button combination shortcuts associated to the level builder.
	Change UI Color	Change the color palette of the Level Builder's user interface.
	Change Editor Music	Change or mute the "Level Editor" music.
	Exit	Exit the Level Builder. Will give a warning before asking if they would like to proceed.
	Load Level	Select and load a saved .MMLV level file into the Level Builder.
	Save Level	Save the the currently built level as a .MMLV level file. A level cannot be saved if it does not have a name set in the Level Settings.
	Level Settings	Name the currently built level, as well as set Player Abilities and Charge Type.
	Build Online	Host or join an online Level Builder room by either a server lobby or direct IP connection.

These are the sub-categories in Level Settings in greater detail:

Level Name: A textbox that allows the user to type in their level's name. There is a limit of 66 characters for level names and some text characters cannot be used to prevent conflicts with file and system names.
Player Abilities: Allows the user to select what character abilities are enabled or disabled in the created level. These abilities include:
- Sliding (Mega Man exclusive)
- Charge Shots (Mega Man exclusive)
- Double Damage (Proto Man exclusive)
- Proto Strike (Proto Man exclusive)
- Double Jump (Bass exclusive)
- Dodge Roll (Roll exclusive)
- Charge Broom (Roll exclusive)
Charge Type: If the Charge Shot is enabled for Mega Man, the user can select its type:
Mega Man 4 Charge Shot
Mega Man 5 Charge Shot
Mega Man 6 Charge Shot

Button Shortcuts

Shortcut	Tool	Description
CTRL + S	Save Level	Allows user to save the the currently built level as a .MMLV level file. A level can not be saved if it does not have a name set in the Level Settings.
CTRL + O	Load Level	Allows user to select a previously saved .MMLV level file, and load it into the Level Builder.
H to toggle on/off. Hold CTRL to temporarily enable.	Move Screen	Allows the ability or inability to move between screens by holding the left mouse button in, and dragging the mouse across the screen. Assets can not be placed while this feature is in use.
P	Test Play	Allows user to test play their created level. Complete the level, exit the level, or press P or ESC to return to the Level Builder.
ESC	Exit	Exit the Level Builder. A warning appears before asking if they would like to proceed.
G	Grid Toggle	Toggles the ability or inability to see the tile grid in the Level Builder.
C	Find Spawn Point	Moves to the screen where the player's spawn point is placed, if one exists in the created level. If a spawn point does not exist within the created level, using the shortcut will do nothing.
M	Map Toggle	Toggles the ability or inability to see a map of all 1000 screens in the Level Builder.
U	User Interface Toggle	Toggles the ability or inability to see the various buttons and toolbars associated to the Level Builder. When the feature is disabled, moving the mouse to the far top or far bottom of the screen will cause the associated toolbars to re-appear until the mouse is moved away.
1	Weapons	Brings user to menu where they can select the usable weapons within the created level.
2	Music	Brings user to menu where they can select the music that will play within the created level, and listen to previews of each level music.
3	Backgrounds	Highlights Backgrounds in the Top Toolbar, and sets asset to the last selected background
4	Tilesets	Highlights Tiles in the Top Toolbar, and sets asset to the last selected tiles
5	Characters	Highlights Characters in the Top Toolbar, and sets asset to the last selected player spawn point
6	Enemies	Highlight Enemies in the Top Toolbar, and sets asset to the last selected enemy
7	Level Objects	Highlights Level Objects in the Top Toolbar, and sets asset to last selected level object
8	Pickups	Highlights Pickups in the Top Toolbar, and sets asset to last selected pickup
9	Bosses	Highlights Bosses in the Top Toolbar, and sets asset to last selected boss

These tools are exclusive to button shortcuts:

Shortcut	Tool	Description
Hold ALT / Click	Eyedropper Tool	Change the currently selected asset to that of a clicked asset.
Hold TAB	Favorites Selection Wheel	Access the Favorites assets list. The Favorites asset list can not be edited from the Favorites Selection Wheel.
Hold SHIFT + TAB	Recents Selection Wheel	Access the Recents asset list.
Hold SHIFT + ALT + Click	Eyedropper Tool	Change the currently selected asset to that of clicked asset, this one however, wont copy the options.

.MMLV File Format

Glitchy side-effects of improperly text editing a .MMLV file such as having a wide playable character.

.MMLV is the file format used to store data about a Mega Man Maker level.

These files can be edited with certain text editing programs, such as Notepad and some others. Editing the text in these files can change various aspects of the level, including removing limitations on what text characters can and cannot be used in a level's name, how long level names can be, and even how various assets in the level function.

Playing a text edited level files may in some instances cause crashing, glitches, or other oddities to occur that otherwise would not. This could be caused by the player text editing certain values assigned to assets in ways they are not normally intended to be used.

To access .MMLV files saved in-game, they are located in %localappdata%/MegaMaker/Levels on a computer with a Windows operating system. The files may be in another location for computers running Windows through software such as Wine on other operating systems.

Trivia

Luigi has stated that menus have a bit of empty space around them so users can click out of them.
When a level has been named and saved at least once, the Level Builder will periodically attempt to autosave the level in case something goes wrong, such as crashes, softlocks, or the game being suddenly closing. This may cause the game to lag while editing large levels.