Which are you using to run the game? (e.g., the original 2006 PC physical disc/repack, Steam, MAME, or an emulator?)

By default, the 5 or 6 keys on your keyboard act as inserting a physical coin.

Press Alt + Tab to switch to Cheat Engine. Click the Monitor Icon (top-left) and select the Metal Slug executable from the process list.

If you are using a specific standalone "Complete" port that lacks a menu option:

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Before exploring external tools, you should know that the compilation's . Since you can save your state mid-mission, you can effectively bypass the credit limit by reloading from a saved point whenever you die.

If you want to experience the classic Metal Slug series on PC without the frustration of the "Game Over" screen, you have several ways to unlock unlimited credits. Direct Steam Version Fix

If the game uses a credit-insertion mechanic, go to control configuration and map a specific key (like 5 or C ) to "Insert Coin." You can then mash this key to generate infinite credits. Method 2: Cheat Engine Tables (.CT Files)

Using an emulator like MAME, Kawaks, or PCSX2 unlocks a world of features unavailable in the official port, including:

Trainer (generic):