This minigame is just insaniquarium, with zombies instead.
Overview[]
Plants[]
Zero...
Zombies[]
Snorkel Zombie
Strategy[]
Easy. You have two zombies from the start, with each zombie after those costing 100 sun. Click the screen to add a brain to the tank; these are necessary for the zombie's survival. If a zombie turns green, then the zombie is hungry. It dies if you don't feed it in time. Collect 1000 sun to end the level.