Download the game 

https://play.google.com/store/apps/details?id=ad.lvupgames.hctexitlvup

It's 60th floor to escape from the 100th floor tower. 
In order to clear this layer, we're going to have a problem with the elemental symbols. 
You have to solve some math problems! 
Gather 2 sets of hamburgers and submit them to the tray.