Metal Slug 6 (c) 2005 Unknown.
A hack of 'Metal Slug 3'.

>>> TECHNICAL DETAILS
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Main CPU : 68000 (@ 12 Mhz), 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

>>> TRICKS AND TIPS
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By pressing certain button combinations, you can activate various cheats :
* Change Character (this will change your character into another random character, but with the same color scheme as the first): Press D while walking.
* Weapon Change (this will change your weapon into a random weapon, including any super weapons): Press D & A at the same time.
* Stop being fat (this will turn your obese character into his/her thin self again): Press and hold D, then press C, B, and A, then release D.

>>> OTHER GAME RESOURCES
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Game's rom.