Completion Scene ( Next Button problems )

I created a completion scene after my first level, containing a next button and return to menu button. The problem is that my next button only goes to the next scene which would be level 2 but when I complete level 2 it just takes me right back to level 2. I just want to know is there any way to make the next button to me to level3 if I'm on 2 and level 4 if I'm on 3 and so and so on with out having to create so many completion scenes?
Comments
Like say your on level 2 and you just completed it. Have a global attribute and call it something like "what level". Then when your completion scene gets triggered say, change "what level" to 2. Then on the completion scene say, if "what level" = 2 display text-"level2 score", and so on.
Then in the forward button's Rules, When touch is pressed
When Boolean att. is true
Change scene behaviour set to next scene. (i.e that chosen from the dropdown menu in the behavior, not a specific scene name).