Annoying bug has invaded your room! Oh no! Click Annoying bug to score points. Click the backdrop to lose points. The difficulty increases when you get to 10 and 20 points. Get 30 points to win! If you get to 30 points, there is no need to gain more points, even if nothing happens. It takes a while to stop. Oh, and get -20 points to lose.
Credit to catlin-is-cool. It goes faster.