It is not necessary to get ALL 3 stars in one run, you can customise your vehicles for speed or durability and get the stars on separate runs.
You can receive 3 free 'Hint' tokens by clicking on the hat and wrench icon and choosing to 'Like' Bad Piggies on Facebook.
It is always worth taking the time to survey the level completely before you start constructing a vehicle to collect the stars as they can sometimes be situated in devious places, like the opposite way of the goal for example.
When choosing a vehicle it is better to opt for the longer onese as they tend to be more stable then the smaller cars.
To be able to see the entire scenario in on go use the pinch gesture to zoom in and out of the level. Use this useful feature to your advantage to make things easier for yourself.
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