Non-linear Level Transitions

Having a linear gameplay is OK but what if you wan't to give the players some choice?

Step 1

Make a normal level transition (e.g. map 1 to map 2)

Step 2

Copy it and put it in a different part of the map (a secret room, a different way at a crossroads.)

Step 3

Make the second transition to either a different map (e.g. map 1 to map 3) or to a different place on the second map (e.g. map 1 to map 2(left path not right))