Megaman Legends - Windows 95 / 98 / Me

The Blue Bomber comes to the PC in a 3-D quest for an incredible treasure, the Mother Lode. At some point in what is apparently the past of the normal MM series, people live on small islands using machines powered by refractor crystals, which are found by people called Diggers in underground ruins. It's a dangerous job, though, because the ruins are inhabited by dangerous 'Reaverbots' who attack any intruders. MegaMan Volnut, one of these Diggers, crash-lands on Kattelox Island, where he searches for parts for his friend Roll to use to rebuild his airship... and then pirates attack, and then weird stuff starts happening whenever MegaMan goes into the ruins... and ultimately MegaMan has to save the people on the island from being wiped out.