If you grab Mario Tennis: Ultra Smash on #eShop before 17/12 you can net yourself #N64 gem Mario Tennis for free! pic.twitter.com/MGAPkbaqux— Nintendo UK (@NintendoUK) November 20, 2015
ONLY IN THE UK (of Course), when you download Ultra Smash on the Wii U console you get Mario Tennis for N64 virtual Console free. This promotion is running until December 17th, Buy one game and get an older one FREE!? Awesome, except it's only for the UK.
UPDATE: "I've been informed that this promotion is also happening in Australia by a resident of the country. Stay tuned for updates.