Summary pulled directly from Steam - Some text may only be applicable to Steam platform

Sledgehammer is a pure action game on wheels, and a festival of demolition and speed, all in one. Drive the most powerful truck and destroy every opponent that you’ll find on the road or go to the multiplayer mode and decide who is the king of the highway, among your friends.

• Hours of gameplay in the main campaign and 6 minigames in the single player mode.
  
• Multiplayer for up to 8 players simultaneously in cooperative and deathmatch mode. Destroy huge trucks joining forces with your friends or become the best truck driver in a fight to death.
  
• Upgrade your truck using the money you get from successful deals. Melee, light and heavy weapon, armor, nitro…make you truck an unstoppable machine of destruction