In these Brain Busters, the player needs to protect all the endangered plants. Completing a level would earn the player a star before the 1.7 update. After the 1.7 update, the objective is still the same, but only requires the player to progress on the map. If an endangered plant gets eaten or destroyed, the game screen will display "THE ZOMBIES ATE YOUR PLANT!" instead of "THE ZOMBIES ATE YOUR BRAINS!" and the player loses the level in a similar manner. If an endangered Iceberg Lettuce freezes a zombie, the text displayed is identical, even though Iceberg Lettuces cannot be eaten by zombies. Similarly, in Big Wave Beach - Day 30, when an endangered Guacodile rushes away to eat the row of zombies, the player also fails, even though Guacodiles cannot be eaten by zombies. The only time the text is different is in Dark Ages - Night 12, where the text will say "PUFF-SHROOM DID NOT SURVIVE" if the Puff-shrooms disappear normally. All endangered plants will be at level 1 regardless of what level they are at.
Save Our Seeds is a reference to the phrase "Save Our Ship" or "Save Our Souls," also known as S.O.S used in emergencies.
The Roman numerals are the level numbers before the 1.7 update for Ancient Egypt, Pirate Seas, and Wild West. For Frostbite Caves onwards, it is used for disambiguation purposes. The parentheses show where the level is located after the 1.7 update, or if the level is removed in the update altogether.
Jurassic Marsh - Day 15 and Modern Day - Day 15 use exactly the same layout for endangered plants.
If the player dug up the endangered plants before the 1.9 update, they would lose the level as if they were eaten. This would occur because the game registers digging up a plant the same way it does when it gets eaten. After the 1.9 update, the shovel no longer has any effect when used on endangered plants.
If an endangered plant is crushed by a Gargantuar or other type of zombie that crushes plants, the losing screen still says "THE ZOMBIES ATE YOUR PLANT!" even though the zombies didn't technically eat the player's plant. In that situation, the zombies crushed the player's plant instead the text should say “THE ZOMBIES CRUSHED YOUR PLANT”.
Similarly, if an endangered plant is kicked by Mecha-Football Zombie or Punk Zombie out of the lawn, the player loses and the losing screen still says "THE ZOMBIES ATE YOUR PLANT!" instead of "THE ZOMBIES MOVED YOUR PLANT!".
In Dark Ages or Piñata Party, when a Jester Zombie destroyed an endangered plant by a projectile, the losing message will still say "THE ZOMBIES ATE YOUR PLANT!" instead of "THE ZOMBIES DESTROYED YOUR PLANT BY A PROJECTILE!".
In Big Wave Beach, when a Fisherman Zombie pushes an endangered plant into a space without Lily Pad or the tide recedes and drown them, the game over message mentioned above will still display instead of "THE ZOMBIES OR TIDE DROWNED YOUR PLANT!".
When the player uses a shovel (before the 1.9 update) or Big Wave Beach - Day 23 if the Fisherman Zombie pushes an endangered Banana Launcher on them, the normal game over message will still display instead of "YOU DUG UP THE ENDANGERED PLANTS!".
In case of Zombie Parrot stealing an endangered plant, the normal losing message will display instead of "THE ZOMBIES STOLE YOUR PLANT!".
When a trap tile burns an endangered plant, the game will still display "THE ZOMBIES ATE YOUR PLANT!" instead of "THE TRAP TILE BURNED YOUR PLANT!" regardless if the zombie activates them (since they cannot eat them due to activating it when one steps on them) or the player if one plants a plant on them.
Even though the player's brains are not eaten if the plant is eaten, the brain image is still shown if the player loses.
The endangered plants are placed on yellow and black squares, which is the universal caution sign with diagonal stripes.
In Pirate Seas, if a Zombie Parrot steals an endangered plant, the black and yellow panel is stolen along with that plant.
Not counting Piñata Parties, Far Future - Day 20 and Jurassic Marsh - Day 36 are the only levels with the endangered plants being premium plants.
Sometimes, the brain will not show up if the endangered plants were eaten or destroyed by the zombies. This could be a glitch.
Due to a possible glitch, Wall-nut First Aid does not work on the endangered Wall-nuts in the Wild West Save Our Seeds levels. However, it could have also been implemented as an extra layer of challenge. This works in the Chinese version though.
Also, there are no Key Gates for Save Our Seeds in Kongfu World.
When the player starts a level, they can sometimes see the dirt under the endangered plants from the planting animations.
The endangered tile can be on Lily Pads. It covers the Lily Pad, making them unseen. The only way for this to happen is Fisherman Zombie pulling the endangered Banana Launchers forward in Big Wave Beach - Day 23.
Zombies sent by a Pterodactyl and Prospector Zombies will not die if they are only the zombies remaining in a gameplay, just like on levels with flowers. This was done in order for them to eat an endangered plant from behind.
All endangered plants are preset at level 1 regardless of what level they are at.
However in an leveled up quest the player may be issued leveled up endangered plants.