Big Trouble Little Zombie is a Pool mini-game based on Adventure Mode Level 3-5 in Plants vs. Zombies, Plants vs. Zombies: Journey to the West, and Plants vs. Zombies: Great Wall Edition. The zombies in this level are shrunken and have only a quarter of their regular health, but come in higher numbers, walk faster, and eat faster. This level is replaced with Heat Wave in the Nintendo DS and Nintendo DSiWare versions of Plants vs. Zombies. On iOS versions, this can be played in Quick Play.
Cherry Bombs should be used to blow up large groups of zombies, especially the Football Zombies. As the player sets up Peashooters in every lane. The Wall-nuts on land would be planted where necessary and in the Pool to lure out Snorkel Zombies. In emergencies, Lily Pads can substitute for Wall-nuts to lure out Snorkel Zombies. Save up your Cherry Bombs for waves and large clumps of zombies. It is recommended that the player save at least two for emergency situations due to the numbers of zombies.
The health of little zombies is as follows:
- Zombie, Snorkel Zombie and Flag Zombie: 3 peas
- Conehead Zombie: 7 peas
- Football Zombie: 20 peas
- Zombie Yeti: 12 peas (runs away after reaching the third square).
- Since the zombies have a quarter of their regular health, a pea against a small zombie does damage equivalent to a melon against normal zombies (excluding the splash damage).
- The regular zombies in this mini-game have the same health and speed as the Imps in I, Zombie.
- Zombies in this level walk and eat plants slightly faster than the regular zombies.
- In the Nintendo DS version, this mini-game is replaced by Heat Wave, possibly because it would be extremely hard for players to see zombies in this mini-game due to the small size and quality of the Nintendo DS version.
- In the Xbox Live Arcade, PlayStation 3, and Windows versions, the ambient zombie voices are high-pitched in this level.
- The zombies' small size does not affect their hitboxes.
- With hacking, the player can make any zombie in the game become little in this mini-game.
- Dr. Zomboss' shrinking experiment is shown in the Nintendo DS trailer. Ironically, it is the one version that does not include this mini-game.
- If the player hacks to get a Magnet-shroom, any small gear it attracts will become normal sized.
- In the iOS version, Snorkel Zombies can jump over the player's lawn mowers and even pool cleaners, meaning it would reach his or her house quickly.
- †: Strategy page