Finally solved. Great level, thanks! By the way, congrats to be featured at official Mekorama FB page.
I was completed this level Spoiler: My solution without using that balls . i am pushed b bot to another side and just put him on underground dragable and level was completed.
@pankaj bhosale The balls can be used to hit down the R bots, although it's not required in this level.
I was kind of confused at the beginning about the purpose of the R-bots, but when you focus, this is a really fun level with just the right amount of ability required, really cool! Thanks.
Sooooo much fun. But (re: level description) you really could show as much mercy as you wanted to. Multiple ways to win. Or just forget about winning & fire away. Whee!
Took time to figure the intended gameplay. Spoiler Sending B to Other side and Knocking off all the Rs. Or just get down without knocking them off.