Don't bother with them until after you finish the game. You can go back and clean those up after you finish the game,if you just want the achievements, with all of your upgrades which makes the early levels a cakewalk.
Don't bother with them until after you finish the game. You can go back and clean those up after you finish the game,if you just want the achievements, with all of your upgrades which makes the early levels a cakewalk.