diff --git a/src/combat.cc b/src/combat.cc
index f161eb4c..5f5eaa96 100644
--- a/src/combat.cc
+++ b/src/combat.cc
@@ -5266,7 +5266,7 @@ int calledShotSelectHitLocation(Object* critter, int* hitLocation, int hitMode)
     int calledShotWindowX = (screenGetWidth() - CALLED_SHOT_WINDOW_WIDTH) / 2;
     // Center vertically for HRP, otherwise maintain original location (20).
     int calledShotWindowY = screenGetHeight() != 480
-        ? (screenGetHeight() - 100 - 1 - CALLED_SHOT_WINDOW_HEIGHT) / 2
+        ? (screenGetHeight() - INTERFACE_BAR_HEIGHT - 1 - CALLED_SHOT_WINDOW_HEIGHT) / 2
         : CALLED_SHOT_WINDOW_Y;
     gCalledShotWindow = windowCreate(calledShotWindowX,
         calledShotWindowY,
diff --git a/src/core.cc b/src/core.cc
index d94efcc6..0ef12bd5 100644
--- a/src/core.cc
+++ b/src/core.cc
@@ -4,6 +4,7 @@
 #include "color.h"
 #include "dinput.h"
 #include "draw.h"
+#include "interface.h"
 #include "memory.h"
 #include "mmx.h"
 #include "text_font.h"
@@ -2047,6 +2048,8 @@ int _GNW95_init_mode_ex(int width, int height, int bpp)
             if (configGetBool(&resolutionConfig, "MAIN", "WINDOWED", &windowed)) {
                 fullscreen = !windowed;
             }
+
+            configGetBool(&resolutionConfig, "IFACE", "IFACE_BAR_MODE", &gInterfaceBarMode);
         }
         configFree(&resolutionConfig);
     }
@@ -4617,6 +4620,16 @@ int screenGetHeight()
     return rectGetHeight(&_scr_size);
 }
 
+int screenGetVisibleHeight()
+{
+    int windowBottomMargin = 0;
+
+    if (!gInterfaceBarMode) {
+        windowBottomMargin = INTERFACE_BAR_HEIGHT;
+    }
+    return screenGetHeight() - windowBottomMargin;
+}
+
 void mouseGetPositionInWindow(int win, int* x, int* y)
 {
     mouseGetPosition(x, y);
diff --git a/src/core.h b/src/core.h
index 4ffc913d..32ea7383 100644
--- a/src/core.h
+++ b/src/core.h
@@ -636,6 +636,7 @@ bool _vcr_load_record(STRUCT_51E2F0* ptr, File* stream);
 
 int screenGetWidth();
 int screenGetHeight();
+int screenGetVisibleHeight();
 void mouseGetPositionInWindow(int win, int* x, int* y);
 bool mouseHitTestInWindow(int win, int left, int top, int right, int bottom);
 
diff --git a/src/elevator.cc b/src/elevator.cc
index 4f7e3880..dd4589e8 100644
--- a/src/elevator.cc
+++ b/src/elevator.cc
@@ -6,6 +6,7 @@
 #include "draw.h"
 #include "game_mouse.h"
 #include "game_sound.h"
+#include "interface.h"
 #include "map.h"
 #include "pipboy.h"
 #include "scripts.h"
@@ -535,7 +536,7 @@ int elevatorWindowInit(int elevator)
     }
 
     int elevatorWindowX = (screenGetWidth() - gElevatorBackgroundFrmWidth) / 2;
-    int elevatorWindowY = (screenGetHeight() - 100 - 1 - gElevatorBackgroundFrmHeight) / 2;
+    int elevatorWindowY = (screenGetHeight() - INTERFACE_BAR_HEIGHT - 1 - gElevatorBackgroundFrmHeight) / 2;
     gElevatorWindow = windowCreate(
         elevatorWindowX,
         elevatorWindowY,
diff --git a/src/game_mouse.cc b/src/game_mouse.cc
index f35eadee..0f3c3fba 100644
--- a/src/game_mouse.cc
+++ b/src/game_mouse.cc
@@ -852,7 +852,8 @@ void _gmouse_handle_event(int mouseX, int mouseY, int mouseState)
         }
     }
 
-    if (!_mouse_click_in(0, 0, _scr_size.right - _scr_size.left, _scr_size.bottom - _scr_size.top - 100)) {
+    // TODO: allow clicking to the left and right of the INTERFACE_BAR if gInterfaceBarMode is enabled
+    if (!_mouse_click_in(0, 0, _scr_size.right - _scr_size.left, _scr_size.bottom - _scr_size.top - INTERFACE_BAR_HEIGHT)) {
         return;
     }
 
diff --git a/src/interface.cc b/src/interface.cc
index 0f8271bb..13bc579b 100644
--- a/src/interface.cc
+++ b/src/interface.cc
@@ -29,12 +29,6 @@
 
 #include <stdio.h>
 
-#define INDICATOR_BOX_WIDTH 130
-#define INDICATOR_BOX_HEIGHT 21
-
-#define INTERFACE_BAR_WIDTH 640
-#define INTERFACE_BAR_HEIGHT 100
-
 // The width of connectors in the indicator box.
 //
 // There are male connectors on the left, and female connectors on the right.
@@ -337,6 +331,9 @@ unsigned char* gInventoryButtonDownFrmData;
 // 0x59D40C
 unsigned char gInterfaceActionPointsBarBackground[90 * 5];
 
+// Should the game window stretch all the way to the bottom or sit at the top of the interface bar (default)
+bool gInterfaceBarMode = false;
+
 // intface_init
 // 0x45D880
 int interfaceInit()
@@ -352,7 +349,7 @@ int interfaceInit()
     gInterfaceBarInitialized = 1;
 
     int interfaceBarWindowX = (screenGetWidth() - INTERFACE_BAR_WIDTH) / 2;
-    int interfaceBarWindowY = screenGetHeight() - INTERFACE_BAR_HEIGHT - 1;
+    int interfaceBarWindowY = screenGetHeight() - INTERFACE_BAR_HEIGHT;
 
     gInterfaceBarWindow = windowCreate(interfaceBarWindowX, interfaceBarWindowY, INTERFACE_BAR_WIDTH, INTERFACE_BAR_HEIGHT, _colorTable[0], WINDOW_HIDDEN);
     if (gInterfaceBarWindow == -1) {
diff --git a/src/interface.h b/src/interface.h
index 828c4f05..b7f3141a 100644
--- a/src/interface.h
+++ b/src/interface.h
@@ -35,6 +35,12 @@ typedef enum InterfaceNumbersColor {
     INTERFACE_NUMBERS_COLOR_RED = 240,
 } InterfaceNumbersColor;
 
+#define INDICATOR_BOX_WIDTH 130
+#define INDICATOR_BOX_HEIGHT 21
+
+#define INTERFACE_BAR_WIDTH 640
+#define INTERFACE_BAR_HEIGHT 100
+
 // The maximum number of indicator boxes the indicator bar can display.
 //
 // For unknown reason this number is 6, even though there are only 5 different
@@ -171,6 +177,7 @@ extern unsigned char* gOptionsButtonDownFrmData;
 extern unsigned char* gSkilldexButtonUpFrmData;
 extern unsigned char* gInventoryButtonDownFrmData;
 extern unsigned char gInterfaceActionPointsBarBackground[450];
+extern bool gInterfaceBarMode;
 
 int interfaceInit();
 void interfaceReset();
diff --git a/src/map.cc b/src/map.cc
index c829cadb..ba7c55d9 100644
--- a/src/map.cc
+++ b/src/map.cc
@@ -143,7 +143,7 @@ int isoInit()
         _square[elevation] = &(_square_data[elevation]);
     }
 
-    gIsoWindow = windowCreate(0, 0, _scr_size.right - _scr_size.left + 1, _scr_size.bottom - _scr_size.top - 99, 256, 10);
+    gIsoWindow = windowCreate(0, 0, screenGetWidth(), screenGetVisibleHeight(), 256, 10);
     if (gIsoWindow == -1) {
         debugPrint("win_add failed in iso_init\n");
         return -1;
@@ -167,14 +167,14 @@ int isoInit()
 
     debugPrint(">art_init\t\t");
 
-    if (tileInit(_square, SQUARE_GRID_WIDTH, SQUARE_GRID_HEIGHT, HEX_GRID_WIDTH, HEX_GRID_HEIGHT, gIsoWindowBuffer, _scr_size.right - _scr_size.left + 1, _scr_size.bottom - _scr_size.top - 99, _scr_size.right - _scr_size.left + 1, isoWindowRefreshRect) != 0) {
+    if (tileInit(_square, SQUARE_GRID_WIDTH, SQUARE_GRID_HEIGHT, HEX_GRID_WIDTH, HEX_GRID_HEIGHT, gIsoWindowBuffer, screenGetWidth(), screenGetVisibleHeight(), screenGetWidth(), isoWindowRefreshRect) != 0) {
         debugPrint("tile_init failed in iso_init\n");
         return -1;
     }
 
     debugPrint(">tile_init\t\t");
 
-    if (objectsInit(gIsoWindowBuffer, _scr_size.right - _scr_size.left + 1, _scr_size.bottom - _scr_size.top - 99, _scr_size.right - _scr_size.left + 1) != 0) {
+    if (objectsInit(gIsoWindowBuffer, screenGetWidth(), screenGetVisibleHeight(), screenGetWidth()) != 0) {
         debugPrint("obj_init failed in iso_init\n");
         return -1;
     }
@@ -577,9 +577,9 @@ int mapScroll(int dx, int dy)
     Rect r2;
     rectCopy(&r2, &r1);
 
-    int width = _scr_size.right - _scr_size.left + 1;
+    int width = screenGetWidth();
     int pitch = width;
-    int height = _scr_size.bottom - _scr_size.top - 99;
+    int height = screenGetVisibleHeight();
 
     if (screenDx != 0) {
         width -= 32;
@@ -601,7 +601,7 @@ int mapScroll(int dx, int dy)
     if (screenDy < 0) {
         r1.bottom = r1.top - screenDy;
         src = gIsoWindowBuffer + pitch * (height - 1);
-        dest = gIsoWindowBuffer + pitch * (_scr_size.bottom - _scr_size.top - 100);
+        dest = gIsoWindowBuffer + pitch * (screenGetVisibleHeight() - 1);
         if (screenDx < 0) {
             dest -= screenDx;
         } else {
diff --git a/src/skilldex.cc b/src/skilldex.cc
index 711e00b5..3c18c847 100644
--- a/src/skilldex.cc
+++ b/src/skilldex.cc
@@ -8,6 +8,7 @@
 #include "game.h"
 #include "game_mouse.h"
 #include "game_sound.h"
+#include "interface.h"
 #include "map.h"
 #include "memory.h"
 #include "object.h"
@@ -187,7 +188,7 @@ int skilldexWindowInit()
 
     // Maintain original position relative to centered interface bar.
     int skilldexWindowX = (screenGetWidth() - 640) / 2 + 640 - gSkilldexFrmSizes[SKILLDEX_FRM_BACKGROUND].width - SKILLDEX_WINDOW_RIGHT_MARGIN;
-    int skilldexWindowY = screenGetHeight() - 100 - 1 - gSkilldexFrmSizes[SKILLDEX_FRM_BACKGROUND].height - SKILLDEX_WINDOW_BOTTOM_MARGIN;
+    int skilldexWindowY = screenGetHeight() - INTERFACE_BAR_HEIGHT - 1 - gSkilldexFrmSizes[SKILLDEX_FRM_BACKGROUND].height - SKILLDEX_WINDOW_BOTTOM_MARGIN;
     gSkilldexWindow = windowCreate(skilldexWindowX,
         skilldexWindowY,
         gSkilldexFrmSizes[SKILLDEX_FRM_BACKGROUND].width,