We're excited to announce that we've fully migrated the Xbox Forums to their new home, here on the Microsoft Community forums!
As of today, going to forums.xbox.com will redirect you here to the Xbox area of the Community forums. We've moved all of your existing threads over so you can continue and start conversations with the new forums experience.
We sincerely appreciate the feedback you have provided over this transition and can't wait for you to check out the new Xbox Forums!
I unlocked the last tier and had enough money for the Beserker on the Final Round. All I did was use the Drone character until Round 5. Then moved to the Kantus. Didn't use anyone in the 3rd tier, and then got the Beserker.
It takes about 10 rounds to unlock the Final tier anyways if I'm not mistaken.