Unlockables
Special Music and Tonko Art Gallery - To unlock Tonko's art Gallery and the special music you have to take specific steps with both difficulty and number of continues.
Here's how you access the items.
Special Music Complete Metal Slug 1-5 and X on Hard with limited continues and also completing Metal Slug 6 with limited continues
Tonko Art Gallery Complete Metal Slug 1-5 and X on Easy with limited continues and also completing Metal Slug 6 with limited continues
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