[ARCADE] SNK Neo-Geo MVS Cart.
Metal Slug 4 Plus © 2002 Unknown.
This Plus version is a hack of "Metal Slug 4". It adds the ability to change, on the fly, the character status (normal=>big=>mummy=>monkey) by pressing the Start button. When using the pistol the dark cloud is always present and after you have picked up a weapon you can press D to cycle through all possible weapons (except the 2-machinegun).