Take Insaniquarium game as example, which the way of playing is just moving the mouse, clicking the coin, fish, the monster, item for sale. Everything you do is just about clicking. Perhaps, almost no double clicking or right clicking. Sometimes, you need to do some typing when filling in your data. Sometimes when you want to activate the cheat code, you need to type the cheat code. Simple indeed in playing, but not always simple in winning the game. That's why the games are so challenging and fun.
