Upgrading Towers / Turrets

[BigKenW]

Hey all,

I started playing this and like it a lot. However for the life of me I can't seem to figure out how to upgrade towers. I used the keys as shown in the controls but they do nothing.

Is there some simple concept I might be missing? Anyone got a link or easy instructions on doing a tower upgrade? I am thinking I am doing something really wrong or missed a key item on upgrades.

Thanks!

[Sleigh82]

It might be you're not far enough along in the campaign, it's a while since I played through it. When you select a tower you should see a button saying upgrade just under the curve of the support options, so on the right hand side of the central panel.

[johnh10]

I think the upgrade becomes available after the first 10 'tutorial' levels.

[Tomohawkmissile]

Originally Posted by johnh10

I think the upgrade becomes available after the first 10 'tutorial' levels.

Level up on the levels = more upgrades in the campaign. There is an option to unlock the level restriction, too, ya know