Zombiquarium is a mini-game unlocked by beating Adventure Mode and other mini-games in Plants vs. Zombies, Plants vs. Zombies: Journey to the West, and Plants vs. Zombies: Great Wall Edition. In it, the player spends five sun to feed brains to Snorkel Zombies which produces sun in return. Up to three brains can be in the tank at a time. Also, brains can only disappear by either sinking to the very bottom or if a zombie eats it. The player can also use sun to buy more Snorkel Zombies or to buy the trophy and win the level. The trophy costs 1000 sun. Each brain costs five sun. One Snorkel Zombie costs 100 sun. The player has 20 seconds to feed a Snorkel Zombie before it dies.