Metal Slug 4 Plus (c) 2002 Unknown.

>>> TECHNICAL DETAILS
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SNK Neo-Geo MVS hardware
Main CPU : 68000 (@ 12 Mhz)
Sound CPU : Z80 (@ 4 Mhz)
Sound Chips : YM2610 (@ 8 Mhz)
Screen orientation : Horizontal
Video resolution : 320 x 224 pixels
Screen refresh : 59.19 Hz
Palette colors : 4096
Players : 2
Control : 8-way Joystick
Buttons : 4

>>> TRIVIA
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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.

>>> OTHER GAME RESOURCES
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Game's rom.