Sierra Preps Three for XBLAToday, Sierra Online announced three new games headed for Xbox Live Arcade and PC. Switchball, Commanders: Attack!, and Battlestar Galactica are all heading to PC and Xbox Live by years end. Switchball Switchball tasks gamers with guiding a ball through a twisting course suspended in midair. The balls properties will constantly change, forcing gamers to change their strategy on the fly. The ball will appear as a standard Marbleball, a light Airball, an electrically-charged Powerball, and as the dense Metalball. Switchball is already available for PC and comes to XBLA this summer. Commanders: Attack! Commanders: Attack! sports a 30s art deco look, but is surprisingly nothing like BioShock. A turn-based strategy game, Commanders features 15 single-player missions as well as four-player online battles. Commanders: Attack! arrives this fall for PC and XBLA. Battlestar Galactica Based on the mega-popular Sci-Fi Channel TV series, Battlestar Galactica is a top-down action game that pays homage to its roots. Gamers can enjoy single-player missions based on episodes of the TV series or take the battle online against up to seven other people. Online battles feature four-on-four conflicts between human and Cylon ships. Look for Battlestar on PC and XBLA this fall.