Objective: Survive 23 waves
Again this level can be completed on hard by just using cannon towers. My technique was to build a long line of cannon towers with a couple of extra towers near the base to make sure that some of the more hardy enemies don’t get through.
Like I’ve discussed on other levels, I like to make sure that a tower is fully upgraded before building a second.
Objective: Survive 20 waves
Here’s how to beat the palisades on hard.
I always play with the belief that one fully upgraded tower is better than two or three basic towers. It’s much more powerful, offers greater range and takes up less space.
You only have the option if using cannon towers on this level, so that’s all we’ll use.
Start by upgrading the cannon tower that is already placed at the beginning to the level.
Enemies slow down a little when the turn corners. By placing towers on (or near) corners you’ll be able to maximise their effectiveness. Build one tower at a time and only build another when your tower is fully upgraded.
Build another set of towers mirroring the first set you built. Again, build and upgrade one tower at a time. I built an additional cannon tower last, right near the base as a final insurance policy, should any of the quick moving enemies get through.
Your Guide to: Tower Defense by COM2US 