Get 75 stars!

There are 305 Stars throughout the game while each level can grant you up to 5 Stars. The number of stars you get is determined by how many Nuts you collect throughout the level.

Tips

Run through the levels as fast as possible. Quickly destroy enemies and grab the Nuts to keep your Multiplier up. The Multiplier will stay up as long as you keep grabbing Nuts.
Play through older levels when you reach a higher level and obtain better gear. You will be able to run straight through the enemies while quickly collecting the Nuts along the way.
Play with multiple people. More players equals more destruction and more Nuts! 3-4 players should keep your Multiplier at 3x or higher throughout the level.