Defend your base from incoming zombies for 10 days.Zombie coming in four line, use key A,S,D,F to shoot zombie on each line.Good eye-hand coordination are required to complete the game. For more detail, see "How To Play" in game menu.Upgrade available for each days to strengthen and help you defend your base. Unlock achievements on each days to earn more money.
You will get further instructions how to play Codefense while playing it. Have fun!