• Tonko art
Successfully complete Metal Slug 1, 2, 3, 4, 5, 6, and X on any
difficulty setting with limited continues to unlock the Tonko art.
• Special Music
Successfully complete Metal Slug 1, 2, 3, 4, 5, and X on the Hard
difficulty setting with limited continues, and Metal Slug 6 with
limited continues to unlock the Special Music.
• Easy Tokens
Play Metal Slug 3 or Metal Slug 5 on the Hard difficulty setting.
Immediately after you defeat the final Boss (when the Boss is
going up in flames), save the game, then quit to the main menu
once the credits begin. You should get five Tokens. Then, load
the saved game file and repeat as many times as desired.
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