Gazetteer is what happens when you hold OSR crowdsourcing, sometimes called "Gygaxian democracy" in one hand, new-fangled online Storygaming in the other, and scream “NOW KISS”. It is a game of map-detailing and collaborative storymaking, functioning by means of questions and answers. It is led by a facilitator who is required to talk like a pompous blowhard of an explorer throughout. For the players, it is a game of creative writing - and specifically, writing about being dragged by a ridiculous boss into misadventure in pursuit of new horizons and material for his travelogues.
Game prep for a given run-through is half an hour; the entirety of the rules and guidelines, advice and examples, is fifteen pages. For the players, prep is reading or listening to about a page worth of text. No character creation, no fiddly bits.
Like its mechanical predecessors, Doomed Pilgrim and Atop A Lonely Tower, it is engineered to be playable on Facebook, on Discord, or via other social media; Gazetteer itself is also built to be playable in-person. Played online, it requires a small group of interested players, a middling crowd of casual "I'll throw a little bit in here" visitors, or (often) some mix of both.
You should grab and read it immediately.