Finally got the hard badge after ages of grinding (afk on stage 11, middle, lol)... if I could rate this -5/5, I would. 0 fun, you expect people to pay for 'research' that does just about nothing... I tested up to 7 tiers of the moab damage one... is that like a 0.05% influence? Whoever pays $35.00 to get a total of 1% influence on the game must be pretty upset. lol.
Well, that was a nerve racking final boss XD, the hydra was irritating though. instant death spam T_T. If you want the impossible badge, just play defensively for the final boss. Don't rush it, and whatever you do, don't leave both turret spots open... don't.
After you get the 100% hp upgrade... your troops are like tanks... I can't even get them killed to replace them T_T. They survived being ran over and bombed at the same time... lol.