Scoring points fills up the Gold Rush bar at the bottom of the screen, so make the most of those multiplier bonuses awarded for eating streaks!
When the bar fills up to the top, it triggers a Gold Rush, filling up your health and making you invincible. During Gold Rush, you even get points for hitting the mines! Each shark has a different Gold Rush duration and takes a different amount of points to fill the bar up to 100%. Each time you trigger a Gold Rush, the bar fills up +7%, making it quicker to get the next one, up to a maximum of 50%.