snk PlayStation Plus unleashing Metal Slug XX for free

PSP and PS Vita compatible, Metal Slug XX will be free starting tomorrow for PlayStation Plus subscribers, according to the PlayStation Plus official blog. As a part of the PlayStation Plus Instant Game Collection Metal Slug XX will be available for a short time for free versus the normal $19.99 price tag.

Metal Slug XX is an upgraded version of Metal Slug 7 on the Nintendo DS and on top of the core game adds mini-games and a co-op mode. Load up your weapons and get ready for the bullet storm.