There are so many different maps in the game that you will hardly ever feel bored. It is also important to note that each map is more challenging than the previous one. As the game progresses you will face harder challenges, harder obstacles, and tricky traps. You will have to use all of your gaming skills in order to overcome it.
Keep in mind that you will also have to grab all diamonds, some diamonds will be hidden behind traps, so make sure that you will check your path carefully.
Watch out for green mud, it can kill both Watergirl and Fireboy!