Regardless of how it is triggered, you will be paid all the wins and Reels 4, 3 or 2 will expand.
It will also start when these two symbols appear the other way around.
This feature can be triggered when Bat-signal lands on reel 5 and Commissioner Gordon lands on Reel 1. If you succeed here, you will get 100 times the bet again. If you failed in trapping him, you would get a chance to try and stop the joker. With the help of the Batman character, you have to take down several inmates and win prizes along the way. After that, you should try to catch the Joker and earn 100 times the bet amount if successful. When 3 or more scatters appear on the reels starting from the left to the right, this will trigger the Descent Into Madness feature.