For most players: 👉 (fastest, no tinkering). 👉 Or just enable Free Play in the in-game options (if available).

Even with limited credits, once you reach a mission, you can typically restart from that specific mission with a fresh set of credits. External Software: Players often use tools like Cheat Engine

to find and "freeze" the memory address for credits or lives. By scanning for the initial value of credits and decreasing it (e.g., by dying once), you can isolate the address and set it to a permanent high value. Third-Party Trainers: Platforms like provide trainers for various PC versions (including Metal Slug 3 Attack Reloaded

Metal Slug Complete PC compilation (released in 2010), credits are natively limited for the majority of the titles. While Metal Slug 5 Metal Slug 6

This is the simplest software-based method that requires no external downloads (beyond the game itself). It exploits a loophole in how the game reads keyboard input during the “Continue?” countdown.

In original arcade cabinets, players inserted coins for each credit. Dying a certain number of times meant a game over unless you added more coins. On PC, this system is often preserved as a “credits” counter (e.g., 2 or 3 credits per run). Unlimited credits remove that limit, allowing infinite continues.