How I beat the game with ease. Choose interceptor. When you start off you need to complete(or fail) levels,until you have enough to put missiles on the first box that is shaded in.(graphical error, an extra weapon slot.) When you get more money trade the two starting weapons out for cannons. At this point you should have 1 missiles, and two cannons, now buy one more missile weapon, and two more cannons. You should now have 4 cannons and 2 missiles, now fill in the rest of the weapon slots (the outer ones, the cannons should be placed on the 4 inside slots)with missiles. Upgrade the cannons as you wish, missiles don't need to be upgraded, I finished with 2 level two cannons and 2 level 3 cannons, along with 5 level one missiles. + the comment so others can see :) - started by imgodzila12