Board Thread:General Discussion/@comment-25120551-20140923124820/@comment-25353417-20140924030711

You kill the zone boss then in the result screen instead of hitting Next button you close the game. When you open the game again the zone boss still there, thus allow you to kill it forever till you hit accidently hit Next button or bored of its face :D

In this way, you can farm prince and queen as they tend to appear more with zone boss

Zone boss is lone boss in the blinking red area in the case u mistake it for area boss :)