by earning tokens through gameplay. The PSP version specifically allows you to download these wallpapers as backgrounds for your PSP/PS Vita main menu. Metal Slug Wiki

Available for all titles in the collection ( MetalSlug1cap M e t a l cap S l u g 1 through and MetalSlugXcap M e t a l cap S l u g cap X ). Infinite Time: Stops the mission timer.

Hold down the button for three seconds during gameplay to open the CWCheat menu, select "Enable Cheats," and toggle your desired modifications. For PPSSPP Emulator (PC, Android, iOS)