This is a Peerful game: players play by connecting their smartphone to a single shared computer.
This authority screen shows a city. A simple grid with square holes.
Randomly, buildings appear inside holes. They grow larger/higher over time, until at some point they flip and start shrinking again.
Your phone screen shows the same grid layout, but they’re mere buttons for each hole now.
When you press that button, you buy the building in its current state. (If you have the funds.) It stops changing. It’s current value/state is yours!
Buildings bought give you rent and points at regular intervals. (The details of this split, and any other rewards/penalties, depends on the building itself.)
The general rule?
Larger buildings cost more, but also give you more.
As such, it becomes a game about finding the perfect moment to claim a building. (Before someone else claims it, before it becomes too expensive, before it shrinks again.)
After X seconds, a round ends. All buildings are removed, except your smallest and your largest.
After X rounds, the game ends. Most points wins.