What are the requirements to achieve 2 or more stars on a level in Empire Defense 2? I've been looking but can't find anything. I've tried all sorts of things, but I get nothing more than 1 star as a result.
I tried the following in different combinations - end with 3000 gold - using only single unit - using all available units - end with general full health - not using any path moves - using all path moves - strategic placement of units and path - upgraded all units before adding new ones - bought new units and another spot for them - end each round with spare time