•Vendor

Could be anything from a cliché tycoon game to a game where you'd have to purchase ''Volunteering Workers'' -NOT SLAVES- to build up an empire.

•Inn

I am talking about the old 2000's MMORPGs, but maybe you are the one who gives the quests?

•Background Interacting w/ The Game

Most games don't care about the background: add a simple blur, call it done. But maybe, a game that is not a puzzle game could interact with the background: a simple system where it shows you where the enemies are, another small system where the background is the only damage source -but I believe this would only work in top-down or platformers-, I believe there are many more examples to give.

See you all in days!