
Achieving the highest rank, the S rank, allows the player to collect medals, which are used for upgrading character attributes. For example, Marco starts off with a full Hit Rate skill while Fio starts with a completely upgraded Pellet skill.Īnother new feature is a grade system, which ranks the player according to their performance on each of the game's 11 levels.

Each character begins with a full proficiency in different categories. These abilities allow characters to increase the damage, "splash" radius, and accuracy of their weapons and vehicle handling, respectively. Players can upgrade each character's combat abilities, categorized into Pellet, Power, Hit Rate, and Machine. Upgrades and customization are some of the largest new features. The game also introduces full three-dimensional movement to the series to coincide with its 3D presentation, which uses super deformed characters. Metal Slug maintains many features from the 2D entries characters use an arsenal of various guns, grenades and explosives, and vehicles. Recurring boss character Allen O'Neil also returns to oppose the player. Because this alliance could only stand to further strengthen Morden's military power, Marco Rossi, Fio Germi, Tarma Roving, and Eri Kasamoto set out to dissolve both parties. Series antagonist General Morden becomes allies with Oguma, president of Oguma Enterprises and world leader of technology.
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The game takes place in the year 2032, four years after the first Metal Slug game and before Metal Slug 7.
