Getting Expert on missions is simple, if you pretend this isn't a tower defense game. Max out all bomb upgrades, starting cash and money per kill. Place a _single_ super tower towards the end of the map (not near where you will bomb, but after it), hold "N" down to summon all waves instantly and bomb the heck out of them. Pick a corner when as many of the tanks as possible are under the bomb. Keep upgrading the super tower till it's maxed! You can hold shift and just keep clicking to keep bombing. The correct clicking speed is where you have a stream of tanks that survive the bomb area, but singly, not overlapping. If you have too few surviving slow down, if too many overlap speed up. I think it's the only way to Expert the higher levels and it's pretty lame if you ask me. Keep this comment alive!
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 "Epic War 5"){kind=icon}
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 "mini Tower Defence (mTD)"){kind=icon}