Talk:Plants vs. Zombies: All Stars/@comment-25043076-20140710102630/@comment-7234182-20140712093254

You need to finish all six previous worlds (American Suburbs, Stone Age, Great Wall, Ancient Egypt, Pirate Seas, and Wild West) to get it.

I don't know if there is also a level limitation (for example, you need to be Level 30 or higher to play Wild West).