Sony Corp. this week said Metal Slug XX for the PS Vita and the PSP is now available at no cost to Playstation Plus members.
The standard price is $19.99.
Metal Slug XX features trademark 2D shooting action and includes characters Marco, Tarma, Fio, Eri, Ralf, and Clark against General Morden and his new rebel army.
Playstation Plus membership offers discounted games, cloud saves, automatic game updates, early access to beta programs, and the Instant Game Collection.
The PS4 will be sold at $399.99 this holiday.