I just got a quick question regarding codes.
Let's say I go out and get a game that's been out for a while now (for example, Mario Kart 8) brand new. It has a code. That can still be entered, correct? There isn't a deadline to enter all your old codes, is there?
Mario Kart 8 is definitely still eligible
That said, Nintendo has been removing older games from being eligible for points for awhile now. If you want to see if an old game you have that has a code will give you coins (and how many), look here:
https://club.nintendo.com/eligible-products.do