, you must beat all seven games on various difficulty levels with limited continues. Debug Menu (Metal Slug 4):
To unlock extra quality features in Metal Slug Anthology on PPSSPP, try the following: metal slug anthology ppsspp cheat list extra quality
Tradeoffs and risks
If you prefer not to use external cheat files, the game has internal milestones: Art Gallery: Beat each respective game (e.g., beat Metal Slug 1 to unlock Gallery 1). Extra Modes: Complete Arcade Mode once to unlock Chubby Isle Paradiso Storming the Mothership Fast Tokens: Metal Slug 3 , you must beat all seven games on
Tap X, Circle, Square, Triangle, Triangle, X, Circle, Square . This allows you to toggle specific game-wide settings. This allows you to toggle specific game-wide settings
: Freezes the stage timer to allow for thorough exploration.
Beyond raw memory codes, the PSP version includes built-in unlockables that can be achieved through gameplay: