though the final boss would be hard but it was easier then the second last one
all u had to do is just to move up and down at the side of the screen facing the boss
for those who cant finish the rookie match because of the health drain here's a tip: at the start of the game skip the tutorial and dont buy the custom gun buy the other gun which is more expensive, and max it out the level would be easy
make it so that we can combine when we click a ninja and drag in onto another ninja, because of the starting layout of units it was pretty hard to use the mouse and drag them to the arrangment we want