you need to make it so the zombies jump at the same point make it so bombs are not causing you to jump into a hole or in sets of 4 and putting an airplane in the beginning when you only have 4 zombies and when you have your special zombies a higher chance of cars spawning also add birds more birds that dont have to do with money and at jumps make the jump slightly above the landing and also the crazy amount of cars and plains is ridiculously you end up losing 4 or 5 of your zombies. potential