Level 12

Difficulty

 * Again, no sun from cats here so you need to use Sunflowers to earn sun
 * 65 monsters is too much for this level so more Pierce-Shooters are needed here.
 * 450 sun is enough for this level

Strategy

 * Plant as much Peashooters and Pierce-Shooters as you can to destroy the cats easily
 * Remember, no sun is gained from cats so take advantage of planting a 3rd Sunflower once you get 175 Sun again after planting your line of defense.
 * Don't let the cats scratch your plants so plant at least one Wall-Nut or Tall-Nut depending on your choice to make sure that it is guarantee that cats won't reach onto your shooters