The dust and despair that cloaked the Oklahoma Panhandle in the 1930s served not only to rebuke humanity for our arrogance but also gave ordinary criminals an excellent cover in which to operate. Case in point, the four ordinary thugs who came across a certain bunker out in the wasteland, marked only with a years-old peeling sign depicting an orange hexagon.

The bunker was armored in steel plates, but the door opened on its own to accept visitors. Soon the criminals learned that the bunker somehow tested visitors, passing judgement on them with terrible mental shocks, and trapping them inside until they solved the puzzle.

The criminals hunkered down to wait in ambush for the next set of visitors... the PCs!