This holds the index of the room that the hero is presently in, or 0 when he's outside.

The possible room numbers are as follows:

Room	Description	Movable Object	Items
0	Outdoors / exterior / main map	-	Green key
1	Lowest hut, right hand side	-	Poison
2	Middle hut, left hand side (Hero's start room)	-	Stove
3	Middle hut, right hand side	-	-
4	Highest hut, left hand side	-	-
5	Highest hut, right hand side	-	-
6	(unused index)	-	-
7	Corridor	-	-
8	Corridor	-	-
9	"Crate"	Crate	Shovel
10	"Lockpick"	-	Lockpick
11	Commandant's office	-	Papers
12	Corridor	-	-
13	Corridor	-	-
14	Guard’s quarters 1	-	Torch
15	Guard’s quarters 2	-	Uniform, Yellow key
16	Corridor	-	-
17	Corridor	-	-
18	“Radio”	-	Radio
19	“Food”	-	Food
20	"Red Cross parcel"	-	From parcel: Purse, Wire snips, Bribe, Compass
21	Corridor	-	-
22	Corridor to solitary	-	Red key
23	Mess hall, right room	-	-
24	Solitary confinement	-	-
25	Mess hall, left room	-	-
26	(unused index)	-	-
27	(unused index)	-	-
28	Lowest hut, left hand side	Stove	-
29	Tunnel 2, start of	-	-
30	Tunnel 2	-	-
31	Tunnel 2	-	-
32	Tunnel 2	-	-
33	Tunnel 2	-	-
34	Tunnel 2, end of	-	-
35	Tunnel 2	-	-
36	Tunnel 2	-	-
37	Tunnel 1, start of	-	-
38	Tunnel 1	-	-
39	Tunnel 1	-	-
40	Tunnel 1	-	-
41	Tunnel 1	-	-
42	Tunnel 1	-	-
43	Tunnel 1	-	-
44	Tunnel 1	-	-
45	Tunnel 1	-	-
46	Tunnel 1	-	-
47	Tunnel 1	-	-
48	Tunnel 1, end of	-	-
49	Tunnel 1	-	-
50	Tunnel 1 (initially blocked)	-	-
51	Tunnel 2	-	-
52	Tunnel 2	-	-