PvZ is a tower defense game and at the same time a good strategy game. To beat a level or stage, you need to make a good planning and preparation. With a good strategy in mind, start growing and bringing the right Plants to the Road Trip battles. A good practice is to research on the Map levels and Stages. See what kind of Path patterns for each level or stage and think of a good way to counter the Zombie attack. Best scenario is to keep the number of Plants use to the minimal and just enough to win the match. Also, the Plants use shall be economic so that you are not spending too much Coins or Gems to clear the stages, since all Plants are exploded and vanished after each use. What is more, good observation is needed to spot the Zombie type and their weaknesses to use it against them.
Plants vs Zombies Adventures complete walkthrough guide by levels - Listing
A list of recorded videos on how to beat or win is provided here. See Plants vs Zombies Adventures complete walkthough guide by levels: