Rating every PVZ1 and 2 world bonus: PVZ1 Zomboss fight
This level is the most fun I had in Roof, but it was also pretty stressful since I lost many plants to the Zombot's balls. You need to use Ice-shroom or Jalapeno [sic] to destroy the balls depending on if they're fire or ice, where you use the opposite element's plant to destroy them. Overall it's a 6/10 level and a good end to the adventure mode.