A quick tutorial on Levels.

• Added a new level by duplicating the existing level.
  • 
  • I renamed them to be Level0 and Level1
    • This is important, you need to be able to spell these right later.
  • I created a new tile map for level1.
    • And clobbered the level 0, so I reexported it from a previous instance.
• I am using the Open Level node to change levels.
  • This looks like the way to go in older versions.
  • But it might go away in newer versions.
  • The reference page dies at 4.26...
  • There are other ways to change levels.
• Built a level changer object.
  • This is a new class off the actor object.
• One variable.
  • Level to load of type name.
    • Dragging off "OpenLevel Level name pin"
  • Exposed to the outside so each instance can have a different level to load.
• It has a collision box.
  • I turned the edges on, but did not add a visible part.
• At first just call OpenLevel on begin overlap.
  • But only if the other thing to overlap was a player
  • 
  • We will be back to modify this later.
• I created a new "game instance"
  • This is blueprint derived from the PlatformGameInstance
    • 
    • Documentation is a little scarce, but this is mentioned in various comments and tutorials.
    • I probably could have set this in the Game Mode, but I had an error we will discuss later.
  • You need to set this in the Project settings then.
  • 
• In the game instance, I built two functions with supporting variables.
  • RestorePlayerInformation: responsible for returning the player information when requested.
    • 
    • With variables health and isDead.
  • SavePlayerInformation
    • 

    • SavePlayerInformation(bool PlayerisDead, float PlayerHealth, bool FromConstructor) {
          if (not fromConstructor or firstCall) {
              firstCall=false;
              IsDead  = PlayerIsDead
              Health = PlayerHealth
          }
      } 

    • Only the first call from the constructor will save info.
    • Apparently the constructor is called when you enter the level.
    • Every level.
• I built two member functions for the player character
  • Save State
    • 
    • Called from the constructor, and from the LevelChanger
    • 
    • 
  • RestoreState
    • 
    • Called from the BeginPlay event.
    • 
    • Note, early in the process, this has to be there to get all the interface things right.
• I think the save/restore belong in the player, not the game instance.
• I think you should set up a struct to pass the values.