heres the winning combination, 15 samurai and 10 snipers, and use hemera when they try to go around the samurai and kill your snipers, with this combo you CANT lose, unless your a complete idiot...
the reason for fuel is so that you have to be smart and decide when you want to finish your chains, better to finish the chain to early and get to the next level than to late whereyou dont get anything