Gangster Bros is a side-scrolling shooter where two gangsters, a fat and a thin one, must break their brother out of a maximum-security prison. Gameplay involves navigating through a maze-like level, shooting enemies that come from left and right of the screen in large numbers. The player must carefully time their shots to take out enemies while avoiding collisions with obstacles and other bullets.
The core mechanic of Gangster Bros involves using the gangsters to fight against a variety of miscreants, each with unique behaviors and attack patterns. The player must use the gangsters' positioning to their advantage, taking cover behind walls and pillars to avoid enemy bullets and using enemy weaknesses to their advantage. The objective of each level is to reach the end undamaged while fighting off an endless horde of ill-intentioned foes.
Gangster Bros runs directly in the browser without requiring any downloads or registration. The game has a retro aesthetic, with atmospheric graphics and challenging gameplay reminiscent of classic arcade shooters.