- Expect the levels to get harder progressively! :)
They are easy at first, and harder and harder later. At around Levels 8 and 9 real troubles begin!
- Don't forget to press the SPACE bar to upgrade units.
But choose wisely which ones you want upgrade and when. Stronger units are a bit slower...
- Buy many cheap units - or save up for the better ones. It's your economic and strategic management choice. ;)
Level 9
