Last week saw no new releases on the Xbox Live Arcade but today’s new additions of Rez HD and Chessmaster Live put Microsoft back on the right track. Hopefully, it won’t happen again or, at least, not for a very long time.

Courtesy of Major Nelson:

• Content: Rez HD
• Price: 800 Microsoft Points
• Availability: All Xbox LIVE regions
• Dash Text: [ESRB: E (EVERYONE) MILD VIOLENCE] Single Player, 5.1 Surround Sound, HD (High Definition). Set in a cyberworld, this legendary fast-paced action-shooter created by Tetsuya Mizuguchi will provide the ultimate audiovisual experience as you target the enemies and hack the system while creating your own beats. Five challenging areas, each with its own theme as well as unlockables waiting to be discovered. Don’t be afraid to dig deep into the world’s computer network! This game requires the Xbox 360 hard drive or the 512MB Memory Unit for storage. There are no refunds for this item. For more information, see www.xbox.com/live/accounts.

• Content: Chessmaster Live
• Price: 800 Microsoft Points
• Availability: Not available in Japan and Korea
• Dash Text: [ESRB: E (Everyone)] Single Player, Xbox LIVE Multiplayer 1-2, Local Multiplayer 1-2, HD (High Definition). Chessmaster Live is the Xbox Live version of the reference chess franchise. It features multiplayer and solo modes. There are no refunds for this item. For more information, see www.xbox.com/live/accounts.

As reported on Monday, Rez has been spruced up with nice, shiny HD visuals, as well as 5.1 surround sound support. Likewise, Chessmaster has been updated as well for the XBLA release. Tell us your thoughts on the new releases in the comments below.