Not that hard to master. Finish the current lvls and get the better weapons to get higher chances to get the antidotes for the medium badge. Use the flame thrower for baby zombie lvl and avoid the tesla and ice gun they are pretty useless. Using the grenade and flame launcher to clear the last lvls which were quite challenging.
 "Zomgies 2"){kind=icon}
 "Wartune"){kind=icon}
 "Run 3"){kind=icon}