Colin McRae: Dirt 2 features five racing disciplines, all of which are playable offline:

• Rally racing on non-circuit roads 
• Rallycross races. Each rally-cross race involves up to eight racers competing in multiple lap events on circuit tracks of mixed surface type
• Trailblazer. Similar to rallying, trailblazing features staggered starts. 
• Raid races, multi-car events involving heavyweight vehicles, such as buggies and trophy trucks
• Landrush events, like raid races, but take place on a circuit