The Slug Square is a Regular Army secret weapon, exclusive to Metal Slug Attack. It first made its debut on the game's event titled 'Try Line 6th', where the boss can also become a playable unit.
Information
At last, the Regular Army's secret weapon make its debut! This tank is the largest of all the Regular Army's arsenal, with multiple Regular Army soldiers on board. It protects the base with a variety of bombardments and its impregnable defense.
- ~Metal Slug Attack in-game description.
Details
In Metal Slug Attack's event, this boss is fought at the last stage. The boss will attack the player's units with its Gatling gun. The Regular soldiers on-top of it fires homing bazookas in unison.
The special attack of the boss will also fire 2 cannon blast from its rear and one large cannon shell from its front cannon. The player must be extremely cautious by keeping the boss away from range. As a the special has a very long distance and can pierce.