Traditional metal working in Mexico more. Important metal working centers include Taxco for silver, Santa Clara del Cobre for copper, Celaya for tin and Zacatecas for wrought iron. Metal working in Mesoamerica, especially of silver, gold and copper was advanced by the time the Spanish arrived, mostly concentrated in the modern states of Michoacán, Oaxaca and Guerrero. The mining and working of metals probably came to Mesoamerican cultures from the south. Metal working was principally in gold, silver, tin and lead, with some copper work known in what is now Michoacán. Gold was generally obtained in powder or pellet form in rivers and streams from
Metal Slug Android, Windows Phone, Nintendo Switch and also for PC via Steam. Subsequent main games and spin-offs were created for platforms including Nintendo DS, Neo Geo Pocket Color and Game Boy Advance. A collection of the first seven games in the main series, including the "Metal Slug X" remake, "Metal Slug Anthology", is available for the Wii, PlayStation Portable, and PlayStation 2, with a similar collection, "Metal Slug Collection PC", being available for PC, while a revamped version of the seventh game, Metal Slug XX is separately sold from the collection. A spin-off tower defense game, "Metal Slug Defense", was created