how can i play nes games on the wii
you can use a NES emulator on the wii.
check this link - Wii Brew - For All Your Wii Needs. Wii Homebrew News Wii Saved Games Wii Downloads (the page is a wiibrew pack generator)
and download FCEUltra which is a NES emulator
did Megaman 9 get you nostalgic??