Pirate Seas - Level 5-4 is the third and final spin-off level of Level 5-1 of Pirate Seas in Plants vs. Zombies Online. To get all 3 stars, the player must not plant on Dave's mold colonies placed on four tiles of the second column, and not to lose any lawn mowers. When this level is finished for the first time, the player will get 5 Spring Bean Puzzle Pieces.
- This level is basically Level 5-3 but with faster and more waves of the Swashbuckler Zombies and Seagull Zombies combo. If the player cannot act quickly, these can wreck down the player's defense before the player is able to plant a Wall-nut.
- Remember to quickly finish planting the three Snapdragons on the plankless lanes in order to easily get rid of the Swashbuckler Zombies and Seagull Zombies in the early waves, while don't forget to block off the zombies on plank lanes as well.