easy win max out Engineer (+5% reload) from the start and build 1 sniper followed by 2 electro towers then 1 more sniper then either rockets or more snipers. After maxing out Engineer go for Marksman and then Grenadier
if u need money at the end i just kept on running 2-2 over and over again, upgraded one unit and got 500 bucks. i had 5 mages, 5 dwarves 22 clerics 2 bards and 3 rogues
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