Okay, so I'm making a bound that will have two difficulties: Normal, and Crazy. However, I thought of adding in a unique twist; a random difficulty where a mix you get a random mix of obstacles from normal or crazy. As in like, obstacles 1 and 2 could be from normal, but then 3 could be from crazy. How would I do this? I know you can randomize switches, but I've never done it before so I'm not sure how I would go about doing this.

You randomize by using the "Set Switch" command and selecting random for the switch you want to randomize. This will randomly set the switch to "set" or "clear".

http://Falkoner.CoW.GooglePages.com/Death_Counts.html

Death counts will work to randomize, just pick the difficulty of the next bound after they finish the last bound depending on what death it's on.