4A Games and Deep Silver have announced that they have sold more than 1.5 million Metro Redux games worldwide, which includes Metro 2033 Redux and Metro: Last Light Redux. Both are remastered versions of the last-generation games for current-generation systems and PC.

In addition, Deep Silver says that the Metro Redux bundle for Xbox One and PlayStation 4 has now outsold Metro: Last Light for Xbox 360 and PlayStation 3 in "multiple territories." This is an "unprecedented feat" for a remastered game (and there have been quite a few), Deep Silver says.

"When measured against sales of the previous generation release, Metro Redux is the best performing remaster of this generation," Deep Silver claims.

Sales numbers of other recent remasters, including The Last of Us Remastered, Tomb Raider Definitive Edition, and Dark Souls II: Scholar of the First Sin, have not been announced.

Deep Silver has also announced that it's released Mac versions of Metro 2033 Redux and Metro: Last Light Redux on Steam. These new versions were developed by 4A Games and use OpenGL 4 to offer up "one of the most technically advanced games to appear natively on the Mac platform."

You can buy the games today on Steam, which are available until April 17 at 50 percent off. If you already bought a copy of any Steam version of Metro Redux, you'll also receive a copy of the new Mac edition at no extra charge.

"We are thrilled with the performance of Metro Redux," Deep Silver executive Menno Van der Bil said. "4A Games have created one of the benchmarks by which other re-masters will be judged, and we have seen their efforts rewarded with fantastic critical and commercial success. Metro Redux has introduced many new fans to the series, and we look forward to reaching a whole new audience on Mac."

The Metro series is based on the Metro 2033 novel by Dmitry Glukhovsky.