Expend for movement and hold an amount in reserve for combat. All movement is on hands and knees with little room to turn around. The tunnels are represented in two dimensions only. Cut out and prepare card to form tunnel sections and chambers of varying sizes as seen from above. They are divided into squares, tunnel lengths are at most one square wide and three squares long.
Chambers are different sizes according to taste.
You will also need T junctions, corridor bends and markers for trap doors, stores and equipment. The RATS start at the bottom of the shaft leading from the surface. Straight ahead 3. Tunnel junction 5. Straight tunnel section with trap door 6.