Traditional metal working in Mexico one in silver, which represented the sun and moon respectively. The existence of gold and silver in Mexico was one of the main attractions for the Spanish in the New World, with the conquest of the Aztec Empire and subsequent exploration with the aim of finding more of these precious metals. Mining and metal working became a main aspect of the economy of colonial Mexico. Most of the emphasis was on the mining of gold, silver, copper, iron, lead, platinum and tin with much of the metal, especially gold, shipped to Spain. Initially, the working of metals in the new
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