Chain Reaction

Chain Reaction is the fourth level of Vasebreaker in Plants vs. Zombies and Plants vs. Zombies: Journey to the West. It has Jack-in-the-Box Zombies that can explode and break vases around it.

Strategies
Break the vases to reveal Jack-in-the-Box Zombies, as they will destroy all the vases around them. Place Puff-shrooms where the zombies may end up and when possible, plant Hypno-shrooms next to a Football Zombie, not meeting any resistance. Be careful, however, as the wrong vase may result in a problematic chain reaction of multiple tougher zombies attacking at once. Make sure to be prepared in the event that this happens, as it may be the main reason you will fail frequently.

Trivia

 * There is a sequel to this level called Another Chain Reaction.
 * This level focuses on the Jack-in-the-Box Zombies breaking all the vases, as they immediately explode when they are revealed, hence it being called Chain Reaction.