The game is a hard to learn, hard to master strategy game. You map pick one of the 115 heroes. They're then put to two teams of five: one called the Radiant(Green) and the other, Dire(Red). The map contains three lanes called top, middle and bottom lanes. Usually, the team chooses to go 2-1-2(2 in top, 1 mid and 2 bot). Sometimes, it will be 2-1-1 or 1-1-2 because there will be a roamer. A roamer, as the name applies, goes all over the map where they can help.