This game comes with very little instruction. You MUST die over 100 times to figure out how to defeat your invaders. I maxed out all the things that $$ money will buy, and yet the invaders still win. To the creators of this game: Games with no difficulty are not fun. Games with no way of winning are not fun. You lured me in with the appropriate amount of difficulty, then slammed me to the ground with near impossible missions. Thank you.