Collect all the keys and reach the exit in each level. Be careful though, you can't land on any platforms that are the same color as you and every time you touch a platform you repaint it with your current color.
Use a legendary forbidden sword to complete missions as you slash through an infinite army of ninjas. Although the sword grants tremendous power, it must constantly feed on blood - whether it be that of enemies or of the wielder himself.
Set up a defense to protect your data servers from incoming glitches, bugs, and viruses. Defeat all the waves in each level and unlock new towers that will increase your ability to fight off stronger attacks.