Default weapon lacks the stopping power to beat the tough stages. Buy new or upgraded old guns. Check out these:
Blastinator (2,500 Coins): Two barrels are better than one.
Matter Scatterer (8,000 Coins): Now with faster reloads.
Zappatizer (4,000 Coins): Shoot mad lightning and pick up a bonus hit with chain lightning.
Death Ray Omega (4,000 Coins): The energy weapon of the future, today.
Berzooka (1,500 Coins): Everything's better when you add grenades. Pack of five.
Doodle Destroyer (140,000 Coins): All the best guns rolled into one to make the biggest baddest weapon around.