. "Used five types of plants!"@en . . . . . . "Synergy!"@en . . "Easy"@en . . . "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 was unlocked. It is impossible if the player has not unlocked more than four seed slots, excluding the VIP slot."@en . "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 was unlocked. It is impossible if the player has not unlocked more than four seed slots, excluding the VIP slot."@en .