Visit a friend's Backyard Battleground, or have a friend visit your Backyard Battleground.

Enter the Chamber of Gnomes.

Enter Infinity as a Plant.

Complete 'Captain Smasher's Curse'.

Play a private match with your own custom rules.

Complete 'The Bean Situation'.

Complete 100 waves in Ops.

Complete 'Yuck!'.

As a Plant, vanquish the Z7 Imp.

As Kernel Corn, vanquish 25 Zombies with the Shuck Shot.

Complete 'Boom Tombs'.

In solo ops, swap to another character.