How to make a Game Theme

Cloning the Default Game Theme (SMB)

In the map editor, click the Manage GameThemes button on the home tab.
In the left list, select SMB, then click Clone selected theme at the bottom.
Enter the name of your theme (e.g., SMBPlus) and clcik Do it.
- A folder containing your copied assets will open.

A game theme consists of the following components:
- Theme settings (/ThemeSettings.json)
- Sprite files (/Sprite/)
- Music files (/BGM/)
- Sound effect files (/Soud/)

This document briefly explains how to edit each component.

Remove every duplicate / recolor assets to start with a less cluttery easier to manage game theme.
- Including:
  - E_Bobomb / E_Bobomb{ThemeName}
  - E_Boo
  - E_BoomBoom
  - Every Effect{ThemeName} other than the default / Overworld
  - Every Enemy{ThemeName} other than the default / Overworld
  - Every MapObject{ThemeName} other than the default / Overworld
  - Every Npc{ThemeName} other than the default / Overworld
- These are all optional resources. If you want, you can readd them later.
You can remove AbilityFlag, AppUpdate, ChallengeMode, Design, Etc, BigCircle, every Font, MiniGame1, StageTag, StageWorld, Transition, UIElement, Costumes.
You can also remove every Tile{ThemeName}, Layer{Name} and music files other than the basic ones, like Overworld, Undergorund, Underwater, Castle, etc…
You also don't need to support every player and powerup, you can remove all of them, except MarioSmall and MarioBig.
In fact, in the ThemeSettings you can disable every object (powerups, items, vehicles, enemies, etc…), every player and its power ups, and remove every theme you don't want to support. This way it's much easier to reach a release ready state for your game theme, as you don't need to replace every asset in the game.

Theme settings can be edited in the Manage ThemeSettings menu.
Each item shows a short description at the bottom when clicked.
Try changing different options and see how they affect the game.
For more details, check this detailed tutorial: [[sfmb_tutorial_theme_settings]]{How to use ThemeSettings}

In this game, sprites consist of .sprite files and .png files.
To edit a .sprite file, you need the SpriteEditor tool.
For more details, check this detailed tutorial: [[sfmb_tutorial_sprites]]{How to work with sprites}

BGM in this game consists of .ogg files and .bgm files.
A .bgm file stores loop section information for the corresponding .ogg file, and it can be created using the TestSoundLoop.exe program.