Know a 3DS/3DS XL owner in the United Kingdom who conveniently hasn't registered their handheld yet? If you just so happen to register a copy of Monster Hunter 3 Ultimate to your Club Nintendo account from now until June 30th, you'll receive a complimentary Recommendation Code. Pass that code onto a friend who is planning on registering their shiny new 3DS hardware between now and July 31st, and they can redeem it for a free download of MH3U from the UK eShop.
The Recommendation Codes themselves are good until August 5th 2013. Don't mix all those dates up! If you've already registered your copy of MH3U back when it first launched, you'll still be eligible to get a code from the Club Nintendo UK website starting tomorrow. Hit the official promotion website link below for further details on how to get and claim the codes.