A bit violent but very good Mario game with guns.
In Super Mario Bros: Bloody Battles, Bowser somehow got a hold of deadly weapons, and is using them to terrorise the Mushroom Kingdom, spilling blood everywhere. It is up to you to avenge the deaths of so many. Annihilate Bowser and his minions with all kinds of weapons.
You can play with Mario or Luigi.
One remark: You cannot run upto walls when holding a weapon, so release it first (Up + Ctrl)
in menu/map: arrows + Shift
Arrows = Move, duck, slide down shapes
Shift (or X) = Jump
Up+Shift = Spin jump
Ctrl (or Z) = Run, pick up things, shoot
Up+Ctrl = Release things
Enter = Pause/unpause
F1 = Help
F2 = Restart game
F3 = Full screen + resolution
F4 = Full screen (blurry)
Esc = Exit game