This game is also available on Neo Geo.
Retro Game Cheats for Metal Slug (PlayStation)
Effect: Cheat Mode
When:
At the options screen
How:
At the options, screen press X, Circle, Square, Triangle, Triangle, X, Circle, Square
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Effect: Bonus Mini-games
When:
Select the "Another Story" option
How:
Select the "Another Story" option that appears after the game play is completed to play three mini-games
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