My favorite games are generally those that need the most exploration.
In general, I enjoy gaming systems that encourage research and the discovery of new facts.
My favorite games still allow for exploration and the discovery of strange artifacts, even when they aren't genuine.
I like games that let me explore the world at my own pace.
Exploration, both in terms of physical shape and finding new aspects, is emphasized significantly in my favorite games.
Most of my favorite games allow you to explore both known and unknown places and sights.