How Plants V Zombies 2 will be monetised

PopCap reveals premium plants can
PopCap reveals premium plants can't be unlocked through gameplay alone.

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Plants vs. Zombies 2 Review - IGN

PopCap CEO defends move to free-to-play

Rumour: Plants vs. Zombies creator fired over pay-to-win

How does PopCap's CCG debut Plants vs. Zombies Heroes monetise?, Pocket Gamer.biz

Paid vs Zombies - Plants vs Zombies 2 is the new model

Plants vs. Zombies 3 officially announced

Why Plants vs. Zombies 2 Can't Make It To the Top

How Plants vs. Zombies 2 works as a free-to-play game so far