Haha, I think I've finished the game. Level 31 and no higher levels. The best way to train at higher levels is the bombing technique. Go figure! Tip: spam waves
This submachine is great!! The best submachine I played so far, it beats all the previous submachines and submachine 6! I love the way you can jump from 'world' to world :)
 "mini Tower Defence (mTD)"){kind=icon}
 "Black Navy War"){kind=icon}
 "Submachine4: the Lab"){kind=icon}