Nutag.

Nutag turns everyday purchases into a real-world territory game. Order at a real venue (an Ortoo) and you collect today's part toward building a traditional Mongolian Ger. Eight parts raise one, and it stands as long as you keep visiting: go seven days without an order there and it falls. Nobody can knock it down — a Ger is only ever lost to neglect. When it falls you get your parts back, all but the roof poles, which are what actually break in real life. Territory is per player: every venue page shows how many Gers stand there and how many are yours. Underneath the game is a real ordering utility for the venue, so a visit only counts once it is proven — a settled payment, or a staff tap at the counter. The part a venue gives is fixed for the day and shown before you order, and it is the same however much you spend: never rolled, never a spend multiplier. Optional paid drops (three a day, a short walk away, part shown before you buy) let you skip one day's walk; the whole game is playable without them.