Yeti

While playing Plants vs. Zombies 2, you may get a big warning on your screen that a Yeti appeared. When this happens, find the specific level that the Yeti is on (this should be indicated by the picture of a yeti's head by a level) and play that level.

When the Yeti shows up during the game, focus a lot of firepower on him. Once downed, the Yeti will drop a lunchbox that can be full of all sorts of goodies from Keys to Coins and more.