Well, using the same logic and almost the same action from your other thread:
How do I change layout at certain score?
You can do it like this:
System > Compare Variable Value (Score = 50) -- System Go to Layout (name of layout)
System > Compare Variable Value (either create a variable that checks the death of player or have a health variable for example to check that) -- System Go to Layout (the starting layout).
The above will send you to the start if you die or if you get 50 score, you get the next layout on the list
If however you want that the score will keep on loading the next layout automatically without you having to enter the Layout name after the score is 50. I think something along the below would work:
For the sake of the example, I'll assume that you have your levels named as "Level1", "Level2", "Level3", etc... and that you will load "Level5" if the score reaches 50
Create a global variable called LevelNumber (for example) and set the default value to 5.
System > Compare Variable Value (Score = 50) -- System > Go to Layout ("Level" & LevelNumber)
-- System > Add to Variable (LevelNumber) 1
System > Compare Variable Value (Score = 50)
AND
System > Compare Variable Value (LevelNumber > 5) -- System Go to Layout ("Level" & LevelNumber)
-- System > Add to Variable (LevelNumber) 1
Hope the above makes sense.