The final boss is actually quite easy if you're taking the right approach. From the start you should be focusing on the commando since just like any other shooter with NPCs, NPCs can't be relied upon to deal the necessary kills. Get your commando to at least lv12, with bouncing betty and AUG HBAR with the ammo feed skill. Now when facing the boss keep at a distance, you outrange him and occasionally you'll find a spot where you can shoot him from but he doesn't retaliate. When he respawns immediately try to get as far from him as possible, rinse and repeat. I was able to end the game with a level 15 commando and a score of 15-9 against him. I'm surprised more people haven't gotten the "hard" badge yet.
For your long treks, open a new tab, hold down right/left/space (In accordance to what is needed for the arduous task), switch to that tab, now switch back and watch as stuff happens without your fingers getting numb ;)
Please stop with the "Use x Support to kill x people" missions on the cities which already have "no support as a requirement" it's quite pointless going back for the destroyer achievement just to fill the other one >.>
Neat little Easter Egg carried from the original Infectonator is that you can watch the zombies kill the humans on the menu screen and collect the coins, it starts you off with a nice little bonus!
@g0bbleg0bble
Not really... levels are mainly as a show for strength, they do however unlock deck slots at lower levels and also unlocks certain cards (though those cards are now near obsolete due to new cards)
Yeah, I was going to create the full version of this game with levels (: thanks for the feedback!