I played Kluster Krystals Megaclusters™ today, lost $30, didn't understand anything!
I dont either, I think I made close to 50 spins and it rarely hit but from what I've understand I think we need to trigger chain reaction to hit multiple symbol with the bonus symbol on the reel atleast 4 times to trigger the main bonus feature. If you trigger 6 times chain reaction without the bonus symbol on the reel, it will reward you with some other bonus round
PS: Still didn't have luck to win over x200! MT 2 don't like me, I got and bought a few bonuses and max win just x127! 
Try chaos crew instead. It has similar bonus feature with MT 2 and there is an event running for the slot
24 hour contest for Chaos Crew slot. Currently only 6 players has taken part in it, click on the image for direct link onto the event page
