If you reveal everything at once, players will have no reason to seek out an expansion or a sequel.
Tim Cain, the creator of Fallout, recently published a new blog post. This time he chose to talk about mysteries within game lore.
In his view, developers shouldn’t answer every question that might occur to a player. Leaving things unsaid creates space for expansions or sequels — “the whole point of an unexplored world is that you can come back to explore it later.”
In Fallout we never explained who Harold was. There was no need — it mattered neither to the plot nor to the world. It’s an intriguing mystery.
Another example is an unfinished quest in Arcanum involving the island of half-ogres:
You know what? People with money and power don’t owe you an explanation. They answer to no one. That’s one of the themes I portray in my games.
Tim Cain highlighted two methods for constructing a “mystery”: you can scatter numerous clues across the game so players can form their own theories while the developers confirm nothing.
The other option is to do nothing at all:
There’s another approach — simply don’t expand the lore. The developers themselves aren’t aware of it, the game never mentions it, and players will never discover it within that title.
Source: iXBT.games