The key to mastering Hydro Thunder is learning to use Hydro Jumps effectively. To perform one of these jumps, pull the Throttle into the Reverse position, then press the Boost button while holding the Throttle in Reverse. You must have Boost fuel in order to perform a Hydro Jump, and the amount of time you hold down the Boost button determines how high you will go. Hydro Jumps are effective for clearing obstacles, grabbing boosts, and reaching certain shortcuts.