Are their different kinds of online games besides Maplestory

Yes. There's a game called Ragnarok Online, which is sort of like Maplestory, but different. Ragnarok Online (RO) is more of a teenagers game, and people can kill other people anytime, anywhere. In RO you don't lose EXP everytime you die, and you level up very fast. The highest level is 255, unless you are a game master (One of the people who created the game.). If you are a game master, you can level up to 500.