If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Help Mario to keep on running as long as possible, by jumping over the ravines in time. If he bumps into boxes and mushrooms, this will slow him down. This is not that bad at all, because otherwise he'll run faster and faster and it will become harder and harder to jump the ravines in time!
Mouse click or space bar to jump.