Metal Slug X is an enhanced version of Metal Slug 2: Super Vehicle - 001/II . The main differences to the original release include:
Additional weapons: Stones, Iron Lizard, Enemy Chaser, Super Grenade, and Drop Shot.
Additional power-ups, items, and prisoners in most of the levels.
Additional times of day: stages can take place at twilight, sunset, or dusk.
Some of the locations and vehicles in the game have been altered.
Increased enemy count. Some of the enemies' placement has been changed.
Many weapons have a stronger explosive force. Explosions yield more unexpected results.
The soundtrack has been re-mixed.
Metal Slug follows Major Poppo and his team as they attempt to stop the evil Imperial Army from taking over Japan. The story begins with the Imperial Army launching a surprise attack on Tokyo, and it's up to Major Poppo and his team to put a stop to their plans.
The gameplay in Metal Slug is fast-paced and action-packed, with a focus on shooting and combat. Players control one of several characters, each with their own unique abilities and strengths, as they navigate through levels and fight against waves of enemies. The game features a variety of power-ups and items that can be used to gain an advantage over the enemy.
Metal Slug was released in 1993 for the Neo Geo AES console.