Metro: Last Light’s second piece of downloadable content is out now.

The DLC tasks players with stepping inside a virtual combat simulator in the game to conquer a series of increasingly-hostile towers.

Each tower is packed with hordes of enemies, mutants, and other deadly threats, said Deep Silver.

“The best players in this combat simulator will need to master Metro’s unique, hand-made weaponry and deep combat mechanics in order to reach the top of the global leaderboards,” it added.

The Tower Pack is priced at US$4.99 (AU$5.59), and is the second of four add-on content packs to be included in the Metro: Last Light Season Pass.

Still to come are the Developer Pack, which boasts a shooting gallery, AI Arena, and Metro Museum, and a bonus solo mission; and the Chronicles Pack, which features three new single player missions starring Pavel, Khan & Ulman, and Anna.

The Tower Pack is available on Xbox 360, PlayStation 3, and Windows PC