The Wily Wars, AKA Rockman: Mega World, is what I like to call the Mario All-Stars of the Megaman series. The first three games of the series were remastered in 16-bit, with one new game added, Wily Tower. It was released for the Genesis only in Japan and Europe; the only kind of release it saw in North America was on the Sega Channel. (However, I do own a reproduction cart that plays on an American Genesis.)
This game has its ups and downs in comparison to the NES games. While I do still prefer the NES games, this version is a cool one to get out now and then, and I've wanted to LP it for awhile now.