There was this really simply yet fiendishly addictive game in the early 1990's called Lemmings. The premise was simple - stop a bunch of lemmings from killing themselves (falling off cliffs, drowing, walking into dangerous objects, etc) by instructing other ones to do specific tasks - build bridges, stop others, etc. It was a remarkably fun game to play and I wasted way too many hours playing it as a teenager. Now, with computers 100x faster and with fancier colors, someone has rewritten the game in HTML code!!! Those freaky geeks! Go have fun.