Gangster Mario:

Gangster Mario is a unique action game where instead of jumping over the enemies you would be able to kill enemies by using a weapon. Your objective is to kill all the enemies in each level to progress to the next. You can play either as Mario, Luigi, or Mr. T. You have three weapons to choose from - shotgun, zap red, and zap gray. Use your mouse to aim and click the left mouse button to fire, use up arrow or W key to jump, down arrow or S to crouch, and use left and right arrow keys or AD keys to move.