diff --git a/experiment.t b/experiment.t
index 3b547cc..55f067f 100644
--- a/experiment.t
+++ b/experiment.t
@@ -25,7 +25,7 @@ gameMain: GameMainDef
 
   showIntro () {
 
-    experimentNumber = rand(100);
+    experimentNumber = 10 + rand(100);
     dayNumber = rand(1000);
 
     "<.p>
diff --git a/src/room/orangeRoom.t b/src/room/orangeRoom.t
index 1c1da74..0ddeea4 100644
--- a/src/room/orangeRoom.t
+++ b/src/room/orangeRoom.t
@@ -17,8 +17,7 @@ orangeRoom: DarkRoom
 
 /* Doors */
 
-+ orangeDoor:
-  Door
++ orangeDoor: Door, AutoClosingDoor
   'white sliding door'
   'sliding door'
   "White sliding door in south wall.<br>"
diff --git a/src/room/yellowRoom.t b/src/room/yellowRoom.t
index f5d726f..dddd23f 100644
--- a/src/room/yellowRoom.t
+++ b/src/room/yellowRoom.t
@@ -3,14 +3,42 @@ yellowRoom: Room
   " This is another room which every surface
     covered with matte white panels.
     <.p>
-    There is a door in the north direction."
-  north = orangeDoorOutside
+    There are three doors in the north wall."
+  north: AskConnector {
+    promptMessage =
+      "There are three doors you could go through to the north.<br>"
+    travelAction = GoThroughAction
+    travelObjs = [brownDoor, khakiDoor, orangeDoorOutside]
+    travelObjsPhrase = 'of them'
+  }
 ;
 
 /* Doors */
 
-+ orangeDoorOutside: Door -> orangeDoor
-  'sliding door'
-  'door number <<gameMain.experimentNumber>>'
-  "Door number <<gameMain.experimentNumber>>.<br>"
++ orangeDoorOutside: Door, AutoClosingDoor
+  -> orangeDoor
+  'orange door*doors'
+  'door with <b>orange</b> triangle'
+  " Sliding door with the number
+    <q><<gameMain.experimentNumber>></q>
+    and an orange triangle.<br>"
+;
+
++ khakiDoor: IndirectLockable, Door
+  'khaki door*doors'
+  'door with <b>khaki</b> triangle'
+  " Sliding door with the number
+    <q><<gameMain.experimentNumber - 1>></q>
+    and a khaki triangle.<br>"
+  cannotUnlockMsg = 'The door does not appear to be opened.'
+;
+
++ brownDoor: IndirectLockable, Door
+  'brown door*doors'
+  'door with <b>brown</b> triangle'
+  " Sliding door with the number
+    <q><<gameMain.experimentNumber - 2>></q>
+    and a brown triangle.
+    <br>You hear a slight vibration behind the door.<br>"
+  cannotUnlockMsg = 'The door does not appear to be opened.'
 ;