-First of all: Build a missile tower on the left side first. It alone will be able to kill the first two waves.
-Second: Expand to the left using gold and damage walls and upwards using range walls, so that you can put a cannon on the top of the map.
-Third: On the upper middle of the block, build a range wall and a slow tower.
-To the right, expand using damage towers, and put flamethrowers on them. The pushers won't stand a chance.
-Upgrade your towers as often as you can, but never sacrifice the game for it.
AGAINST AIR LEVELS:
-First: To the upper left, build range walls, so that you can build flamethrowers on them. Some missile tower will also help you kill spawners.
-Second: To the upper right(wait for the air levels to come), build gold walls and missile towers on them. If you are on hard mode, you may need some flamethrowers too.
NOTE: I myself don't spawn units. They die too quickly. Focus on building towers and walls. Remember to upgrade walls after upgrading some towers.
