it's easy.
only problem is you need to specify every scene since you cant call a scene by simply using its name.
what you have to create is a behaviour as such:
lets say you have 5 scenes you want to pick from.
randomNumber << is a number attribute
when the mous (is released) on (self) << you can also place this on a scene behaviour, using the playbutton actor instead of (self).
set (randomNumber) pick a random number between 0 and 4 << giving 5 different options, since 0 is also an option.
IF randomnumber = 0,
*switch to level 1 using fading or not*
OTHERWISE IF = 1,
*switch to level 2 using fading or not*
OTHERWISE IF = 2,
*switch to level 3 using fading or not*
...(repeat this as many times as needed)