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Used five types of plants!
Difficulty: Easy (impossible without five seed slots)
Synergy! is a secret achievement in Plants vs. Zombies Adventures. It is earned by using five different types of plants in a level. Synergy! could be easily earned once the fifth seed slot or a VIP plant is unlocked. It is impossible if the player has not unlocked more than four seed slots, excluding the VIP slot.
The word "synergy" means the interaction or cooperation of two or more organizations, substances or other agentss to produce a combined effect greater that the sum of their separate effects.