The yellow room and a door between two rooms

src/room/yellowRoom.t

@@ -0,0 +1,16 @@
+yellowRoom: Room
+  'Yellow room'
+  " This is another room which every surface
+    covered with matte white panels.
+    <.p>
+    There is a door in the north direction."
+  north = orangeDoorOutside
+;
+
+/* Doors */
+
++ orangeDoorOutside: Door -> orangeDoor
+  'sliding door'
+  'door number <<gameMain.experimentNumber>>'
+  "Door number <<gameMain.experimentNumber>>.<br>"
+;