"Snowboard Supercross (more commonly known as SSX) is a series of skiing and snowboarding video games published by EA Sports BIG. It is an arcade-style racing game with larger-than-life courses.
Players may choose any one of a number of riders, each with their own statistics and boarding style. A course is selected and the player is given the option of racing down the course or participating in a competition to do tricks.
Each course is filled with ramps, rails, and other assorted objects. Performing tricks fills up the player's boost meter, which can then be used for additional acceleration, making tricks is even important in a race. Players also have the option of practicing or exploring courses in "freeride" mode.
SSX Tricky introduced "Uber Tricks", absurdly exaggerated tricks, often involving detaching the board from the rider's feet. The player gained access to uber tricks during play after filling the adrenaline bar; performing six Uber Tricks earns the player unlimited boost for the rest of the race.
SSX 3 introduced a second, intermediate set of Uber Tricks. Each character has an associated Uber Trick. The unlimited boost system was tweaked to where you simply had to complete 9 Uber Tricks to get the boost bonus, but it now has a time limit, and after that expires, you must redo the second tier to regain unlimited boost. Certain combinations of spins, flips, and Uber Tricks resulted in "Monster Tricks", worth even more points than uber tricks; the catch was that you had to memorize the combination (Triple Backflip Superman, for example), and the combination had to be unlocked through certain goals in the game, such as staying on a rail for 120 meters.
In SSX on Tour "Uber Tricks" are presented as "Monster Tricks", though most of them resemble the more advanced Uber Tricks, and are much easier to perform than the Monster Tricks of SSX3. Where previous SSX titles used the main trick buttons (and the tweak button for later titles) to perform Uber Tricks, the Monster Tricks are performed by combinations of directions entered on the right analog stick."
Source: Wikipedia, "SSX_(series)", available under the CC-BY-SA License.