Upgrading Towers hints and tips for Defense Grid 2

Upgrading Towers

Once you have accumulated enough credits from destroying your enemy you will be able to upgrade your towers to their second and third forms which will provide increased damage and range with each iteration. What you are aiming for is maximising your damage output over as long a path as possible over the longest amount of clock-time possible.

More tricks, tips and cheats for this game are right here - Defense Grid 2 cheats