By the time you get to Kardia,and try to complete the final stage at normal and all complete stages at hard mode.Its like throwing a stress ball over and over and it never bounceses to you.Also its infuriating to get suplies like gears when there a stamina system(the fuel).For example they are being generous when you beat the stage and hard mode of that stage.But after that,i got like 1%-4% of my reward that I beat 5 seconds ago.