Idea: Have paragraphs of text that are chained together. You must expand them one by one. This would force people to read the text in order. You could also monitor how many paragraphs the person read before they got bored and left your site. Other monitoring idea: My game should report back to a server and see what level people "quit" the game at. If I find any one level stand out, I will work on that level to make it more interesting or easier so more people get past that level. I could, optimize the game. People change their habits if they know they are being measured. Thus, to get the most accurate data, you need to find a way to measure behavior without them knowing.