Nintendo sent me 3 of these, one for myself and 2 for friends, except I only have 1 friend.
Redeem through Nintendo eShop.
Local co-op play only (no single-player), except they will have online co-op at these times:
Oct. 16 from 5PM - 10PM (PST)
Oct. 17 from 5PM - 10PM (PST)
Oct. 18 from 7AM - 12PM (PST)