Well every 3 fails at a floor increases the chances by 1, until its a 5 in 6 chance. Also most floors don't have a 1 in 6, though some do. Odds are you will need to use peroamins to get to 200 or glasses to speed it up. If you have money you can buy keys and get half peroamin from the cases. You can easily get to 200 if you are willing to use extras. Completely free without using anything is another story.