Plants Vs. Zombies™: The invasion escalates

In PopCap games' Plants Vs. Zombies™: An escalation of the zombie attack, where (A) zombies come in packs, (B) the gardener has turned first-level defensive peas into flame balls with the right plant combination, (C) a zombie in an inflatable swimming toy eats a plant that failed to knock it out in time, a wet-suited zombie breaches the last line of defense (oh, why did we waste the mower power earlier?!), and the garden is littered with fallen foes.