good remember the alamo strategy. do this is this order. buy 3 gunman. buying combat shotgun. keep killing with combat shotgun and get as many gunman as you can. buying repairman around 13. keep doing this. at around 20 buying laser turrets or w.e and upgrade them all. buying laser gun if you have excess money. and always pay attention and lvs 1-15 and 35-40 b/c of mechs. ADD PLUS SIGN TO KEEP THIS GUIDE ALIVE.