
Completing raids rewards Guild Medals which can be used in the Guild Shop to purchase Space and Independent Army unit parts. Guild Raid (unlocked at Level 8) is a cooperative game mode in which players attack difficult targets spread across several stages.Regular Army unit parts can be purchased here using the POW Shop.
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Rescue (unlocked at Level 5) is a timed mode in which the player is tasked with completing a series of stages of increasing difficulty. Combat School (unlocked at Level 4) is similar to MSD's Mission game mode, sans predetermined unit decks.The medals can be used to purchase Rebel Army unit parts in the Battle Shop. Battle (unlocked at Level 3) is a competitive asynchronous multiplayer mode in which players attack each other and NPCs in pursuit of higher ranks and Battle Medals.Special Ops is a timed cooperative challenge consisting of 3 stages.Attack! is the primary single player game mode and represents a direct improvement of MSD's Sortie.The game goes further by having an interconnected storyline that expands the Metal Slug universe in terms of character development and continued conflict between the various armies. The most noteworthy aspect that distinguishes Metal Slug Attack from its predecessor is introducing a large cast of characters, vehicles, and weapons not seen in previous games. Metal Slug Attack goes farther at allowing players to improve their units' effectiveness. For an extra edge in battle the player can purchase Power-Ups. After finishing the special attack, the unit will continue with its standard attack until the special attack is charged again. After a predetermined length of time, the special attack will become available, indicated by a light blue "aura" surrounding the unit, that is activated by tapping the unit or the "Attack" button. When the unit is within range of an enemy, it will begin its standard attack. Most combatants have both a standard attack (melee and/or ranged) and a special attack. Additionally, destroying enemy units grants a small amount of AP. Paying Rumi Aikawa a certain amount of AP will improve the rate at which AP build up, as well as the maximum AP that can be stored a time. They can either execute attacks, or construct objects that impede the opponent, support allies, or produce additional units at no cost.

Once the game begins, forces start accruing Action Points (or AP for short), which are used to produce units that automatically advance toward the enemy's base. The main objective of the game is to destroy the opposing base by any means.

Much like its predecessor, at the core of this game is the 2D (side-scrolling, given the main series' style) 1-on-1 subgenre of tower defense/strategy, with 2 bases on either side of the level where units are spawned.
