Test Drive Unlimited 2 (TDU2) is a racing video game developed by Eden Games and published by Atari. It is the sequel to Test Drive Unlimited and the tenth game in the series.
There is a storyline in Test Drive Unlimited 2 for the player to follow. To progress through the game, the player has to earn experience points to level up through the 63 levels. These points can be earned via 4 categories:
Competition (racing, completing challenges)
Social (making friends in the game, racing against other people, joining clubs)
Discovery (discovering all roads, taking photographs of specific locations, finding all car wrecks)
Collection (buying cars, houses, furniture, clothing/basic needs)
There are an additional 10 Levels available to those who acquire the TDU2 Casino Online DLC/Pre-order Bonus, these levels are achieved within the casino itself.
Source: Wikipedia, "Test Drive Unlimited 2", available under the CC-BY-SA License.