Board Thread:Plants vs. Zombies 2: It's About Time/@comment-4775209-20130815185328

Does anyone know how to get easy keys in Plants vs. Zombies 2: It's About Time? I'm on Ancient Eygpt and just finished all 11 main levels and I really want to unlock all the Brain Buster levels so I can get enough stars to access Pirate Seas. Please help! Thanks! 