Single Player, Xbox Live Multiplayer 1-2, HD (High Definition). Strap into your time ship and fly through five challenging time periods, each with its own unique enemies, hazards, and bosses. The full version includes access to all levels, Versus and Co-op multiplayer modes, a range of challenging achievements, and the ability to see how your skills rank against other players! There are no refunds for this item. For more information, see www.xbox.com/live/accounts.