here is the BEST tip i can give to anyone. first, change the controls so pause is shift. have your pinkey finger on shift, ring on a middle on s and w and pointer on d and thumb on [ space ]. after you have the controls to pause being shift, click map. now go up. then go right or left. start to spiral around the center. this helps so much because it will make the units you encounter easier over time. i beat the game and the hardest units i encountered was the seeker carrier, and the rest was easy! some mine layers, the heavy cannon whatevers, and y fighters pretty much. if you wanna complete ur bubble-o-pedia, be the ghost sniper (fastest, all the way on the left) class and beat the game. ur on invincable mode. now just fly around the map in one direction and you will probably encounter everything. i think you need to kill it for it to count as it being in the bubble-o-pedia. i like the BFT and the HEAVY tank (last one) to beat the boss because they are just so powerful. i also played and beated it as the super fighter, which is a fun one =] he has orbital seekers, and after one hits it comes back, so what i liked to do is just ram the enemy =P im going to try to get the drone tank next for you guys because my friend told me it turns all enemy drones on your side. im going to see if hes right =] hoped this helped and ill be back to post more.