Alright, I played through the game now and what's up with the turrets, i haven't been able to place them... anyhow, best bet is to get the highest powered gun and always keep it fully stocked on ammo. It's easier to lose by having no ammo than the castle being destroyed... the game gets a tad repetitive, but 20 waves is timed nice, also the end was almost wrong, though overall the game is good enough to keep us wanting more... again: best way to win is keep fully stocked with best gun and repair castle otherwise... MWO is a hand eye coordination enhancer too!