Bethesda is making a series of instructional videos to get folks ready to dive into Brink when it releases on May 10. The first of these "SMART guides"—SMART being their parkour-like automated navigation system, Smoother Movement Across Random Terrain—handles the basics including the various game modes and explaining the various areas of the HUD.
The campaign mode follows the story of the civil war on The Ark, while free play mode allows you to play any of those missions in any order and with custom settings. The final mode, called challenges, are a bit vaguer but are designed to develop your skills with specific objectives to achieve. All game modes allow you to earn experience points to unlock new skills, weapons and outfits for your character. Want to be competitive in Brink on day one? Then stop reading and watch the video, fool.