secret level is easy. split your guys into two groups. stay back out of ranged enemy's range. repair in mountains if need be. and pick them off. all 4 of mine survived with greater than 75% life
meh wave 389 score 1948189417, and lag struck bad screen started to go blothcy yellow and blue. 20 instant killers at start, 20 teleporters near end and whatever you want in the middle and you will never lose. after wave 60 something you only ever get the odd wave immune to instant death.
wave 98 on valentine map with 125 lives. once you get past lv 60 it becomes way too easy. i have to find ways to waste cash. currently have $130k.
build instant kill at start. 3x damage next group and teleporters after that.
too easy. try and get archers as fast as possible to survive the first enemy attack. then research and occupy low level diamond mines or the enemies one and upgrade them.