No reason why you can't even play Charlie. The Tunnel Rats used their hands and ears to grope their way forward in the dark through the tunnel complexes. Each RAT rolls D AVE to see how many action points they have each turn . To move and enter combat points have to be expended. 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.