*Metal Slug X
*Extra Mission
After finishing the game once, this option will be available on the title screen.
*Hidden P.O.W. in Mission 2
In Mission 2, you can find a hidden P.O.W. in the cave to the far of the screen after the first mummy attack.
*Metal Slug Attack
While piloting the tank, simultaneously press Jump and use Grenade/Cannon.
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