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 the 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.