Pirate Seas - Level 3-4 is the third and final spin-off level of Level 3-1 of Pirate Seas in Plants vs. Zombies Online. To get all 3 stars, the player must produce at least 4000 sun and not to lose any lawn mowers. When this level is finished for the first time, the player will get 5 Spikeweed Puzzle Pieces.
- The level is basically the same as Level 3-3. However, the amount of sun required to obtain the third star is higher.