Hmmm, probably Risk. Outside of risk, one of several card games (choosing one would be hard) Cribbage, Hearts, Spades, Gin-rummy: many long winter days, snowed in, holed up in the house playing one or more of those card games.
Secret of Mana, and all the Donkey Kong Country games on SNES.
IRL I loved playing red rover with the kids at church; it was the only time we ever had enough to do it.