Protect your meager supply of acorns from waves of marauding monsters. Starting off with a bow and arrow, you must shoot and kill nut thieves before they pick up your acorns and walk away with them. You gain money by killing enemies and collecting coins that sometimes appear when an enemy is killed. After each day, you can spend your money on weapon upgrades, new fences and mines. New weapons are unlocked after you survive a certain number of days.