The Legendary Map Pack for Halo 3 is now available to download on Xbox Live.

The pack will cost you 800 Microsoft Points, and brings new Forge features along with three new maps: Ghost town, Avalanche and Blackout.

New map Avalanche is all snowy and stuff and based loosely on Sidewinder from the first game in the series. Black is a revamped Lockout from Halo 2 whilst Ghost Town is a new jungly affair likened to Swiss cheese by Bungie.

Anyone who acts quick enough and buys the pack soon will receive a free four-month subscription to Bungie’s PRO file storage thing. This’ll give you 250MB of online space with which you can upload and share screenshots, game types and videos.