Microsoft is not slowing down on beefing up the Xbox One Backward Compatibility list as they just added a couple more games just a few days after the last addition.

Now playable on the Xbox One is the 2D side-scrolling beat 'em up video game "Guardian Heroes," which was first released on the Sega Saturn and the Xbox 360 in 1996.

The classic hack and slash action role-playing Xbox One Backward Compatibility addition chronicles the vicious battle between the Earthblood and the Skyborn.

It comes with a co-op and online play and multiple game modes. "Guardian Heroes" also got a graphics makeover in addition to brand new achievements when it was ported to the Xbox Arcade Live.

The second entry to the Xbox One Backward Compatibility catalog is the first person tactical shooter video game by Codemasters, "Operation Flashpoint: Red River."

In this game, players take on the role of Outlaw 2 Bravo, a United States Marine Corps fireteam active in the fictional conflict set in Tajikistan in the year 2013.

In this Xbox One Backwards Compatibility title, players can choose among four roles in the Marines — rifleman, grenadier, scout and automatic rifleman — which come with their own set of skills and weapons.

The description for "Operation Flashpoint: Red River" reads: "Between Afghanistan and China, the world's next flashpoint is about to erupt. You and your fireteam can make a difference. How much is up to you. It's not the soldier with the most expensive gun or the biggest heart who wins on the battlefield. It's the smartest. Semper fi, Marine."

A couple of days ago, in celebration of the N7 Day, the "Mass Effect 2" and "Mass Effect 3" were added to the Xbox One Backward Compatibility list of games.

Prior to that, Microsoft added a pair of titles as well. On Nov. 1, the role-playing video game "Blue Dragon" was added to the catalog. It was followed by the puzzle-platform game, "LIMBO," after two days.