For those who struggle to complete the last level here is how you do it. You will be fighting against a boss that has three lives. Take all the air attack weapons you can carry to kill the flying boss. Take some good anti-tank weapons with you to kill the scorpion boss. The third boss is really three large fighting orbs, you will need to kill each one. I suggest you use High Voltage Armor if you have it, if you don't then get up close and hit them slowly one at a time, one shot at a time. It is possible, I've done it four times. I hope my tips help you. If you have any other problems just let me know and i'll try and help you. Thank you for reading. Good luck on the battle field. P.S. If this helped you please let me know, I need your feedback. Thank you.
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