Due to all zombies being level 3, the player should respond the same and pick plants with levels as high as possible. Area-of-effect plants are also advised.
The flamethrowers yielded by basic variants are not strong and will not do enough damage to the player's house in order to produce a game over. Nonetheless, the player is severely limited due to Rotobaga and Ghost Pepper being the only flying plants that can be used on the first playthrough.
A strategy to win the first star
A strategy to win the second star
A strategy to win the third star
Plants Vs Zombies 2 Castle in the Sky Day 1 - PVZ 2 China
Plants vs. Zombies 2 China - Castle in the Sky - Day 1