Given a grid, 100 by 100, there are two players called the Sprawler and the Preserver. The Sprawler wants to build more and more houses until the whole grid is covered except for pre-designated parks. The Preserver wants to delay this as much as possible, but doesn't want to stop it altogether.
The Sprawler starts with four houses which the Sprawler may place in any four cells. The Preserver is allowed to place 5 "parks" on 5 grid spaces. The Preserver places a park first, then the Sprawler, then the Preserver, ..., then the Preserver who places a park last. Houses cannot go on park grid cells. Parks cannot go on house cells
After all parks and houses have been placed, the world develops on its own. At each time unit, the Sprawler will establish a new house on a non-park grid cell if there are already houses on at least two neighboring grid cells. Two cells are neighbors if they are next to one another either vertically, horizontally, or diagonally. The goal of the Sprawler is to cover all the non-park grid cells in the shortest time possible. The goal of the Preserver is to make the Sprawler take as long as possible but the Preserver may not make this time infinite.