diff --git a/assets/level4.gif b/assets/level4.gif
index 5544a9f..ec26ad4 100644
Binary files a/assets/level4.gif and b/assets/level4.gif differ
diff --git a/constants.h b/constants.h
index 1fda361..5d9624b 100644
--- a/constants.h
+++ b/constants.h
@@ -477,10 +477,10 @@ uint16_t SFG_monsterAttributeTable[SFG_MONSTERS_TOTAL] =
 SFG_PROGRAM_MEMORY uint8_t SFG_weaponAttributeTable[SFG_WEAPONS_TOTAL] =
 {
   /* knife    */ SFG_WEAPON_ATTRIBUTE(SFG_WEAPON_FIRE_TYPE_MELEE,1,650),
-  /* shotgun  */ SFG_WEAPON_ATTRIBUTE(SFG_WEAPON_FIRE_TYPE_BULLET,2,1200),
+  /* shotgun  */ SFG_WEAPON_ATTRIBUTE(SFG_WEAPON_FIRE_TYPE_BULLET,2,1400),
   /* m. gun   */ SFG_WEAPON_ATTRIBUTE(SFG_WEAPON_FIRE_TYPE_BULLET,1,700),
-  /* r. laun. */ SFG_WEAPON_ATTRIBUTE(SFG_WEAPON_FIRE_TYPE_FIREBALL,1,900),
-  /* plasma   */ SFG_WEAPON_ATTRIBUTE(SFG_WEAPON_FIRE_TYPE_PLASMA,1,550),
+  /* r. laun. */ SFG_WEAPON_ATTRIBUTE(SFG_WEAPON_FIRE_TYPE_FIREBALL,1,850),
+  /* plasma   */ SFG_WEAPON_ATTRIBUTE(SFG_WEAPON_FIRE_TYPE_PLASMA,1,600),
   /* solution */ SFG_WEAPON_ATTRIBUTE(SFG_WEAPON_FIRE_TYPE_PLASMA,4,1050)
 };
 
@@ -488,7 +488,7 @@ SFG_PROGRAM_MEMORY uint8_t SFG_attackDamageTable[SFG_WEAPON_FIRE_TYPES_TOTAL] =
 {
   /* melee                 */ 7,
   /* bullet                */ 10,
-  /* explostion (fireball) */ 13,
+  /* explostion (fireball) */ 17,
   /* plasma                */ 17
 };
 
diff --git a/game.h b/game.h
index 7cb8d2f..9660a40 100755
--- a/game.h
+++ b/game.h
@@ -1707,6 +1707,17 @@ void SFG_playerChangeHealth(int8_t healthAdd)
     SFG_player.lastHurtFrame = SFG_game.frame;
 }
 
+void SFG_playerChangeHealthWithMiltiplier(int8_t healthAdd)
+{
+  if (healthAdd < 0)
+    healthAdd =
+      RCL_min(-1,
+      (((RCL_Unit) healthAdd) * SFG_PLAYER_DAMAGE_MULTIPLIER) /
+      RCL_UNITS_PER_SQUARE);
+
+  SFG_playerChangeHealth(healthAdd);
+}
+
 uint8_t SFG_distantSoundVolume(RCL_Unit x, RCL_Unit y, RCL_Unit z)
 {
   RCL_Unit distance = SFG_taxicabDistance(x,y,z,
@@ -1819,7 +1830,7 @@ void SFG_createExplosion(RCL_Unit x, RCL_Unit y, RCL_Unit z)
   uint8_t damage = SFG_getDamageValue(SFG_WEAPON_FIRE_TYPE_FIREBALL);
 
   if (SFG_pushPlayerAway(x,y,SFG_EXPLOSION_PUSH_AWAY_DISTANCE))
-    SFG_playerChangeHealth(-1 * damage);
+    SFG_playerChangeHealthWithMiltiplier(-1 * damage);
 
   for (uint16_t i = 0; i < SFG_currentLevel.monsterRecordCount; ++i)
   {
@@ -2067,7 +2078,7 @@ void SFG_monsterPerformAI(SFG_MonsterRecord *monster)
 
           state = SFG_MONSTER_STATE_ATTACKING;
 
-          SFG_playerChangeHealth(
+          SFG_playerChangeHealthWithMiltiplier(
             -1 * SFG_getDamageValue(SFG_WEAPON_FIRE_TYPE_MELEE)); 
               
           SFG_playGameSound(3,255);
@@ -2081,10 +2092,7 @@ void SFG_monsterPerformAI(SFG_MonsterRecord *monster)
           SFG_TileDefinition tile =
             SFG_getMapTile(SFG_currentLevel.levelPointer,mX,mY,&properties);
          
-          SFG_createExplosion(mX * RCL_UNITS_PER_SQUARE,
-            mY * RCL_UNITS_PER_SQUARE,
-            SFG_TILE_FLOOR_HEIGHT(tile) * SFG_WALL_HEIGHT_STEP +
-            SFG_WALL_HEIGHT_STEP);
+          SFG_createExplosion(pX,pY,pZ);
 
           monster->health = 0;
         }
@@ -2294,7 +2302,7 @@ void SFG_updateLevel()
             SFG_player.camera.height))
         {
           eliminate = 1;
-          SFG_playerChangeHealth(-1 * SFG_getDamageValue(attackType));
+          SFG_playerChangeHealthWithMiltiplier(-1 * SFG_getDamageValue(attackType));
         }
 
       /* check collision with the map (we don't use SFG_floorCollisionHeightAt
diff --git a/settings.h b/settings.h
index 8ee8a23..3ce4870 100644
--- a/settings.h
+++ b/settings.h
@@ -26,7 +26,9 @@
   integers and rounding errors can occur soon, so don't set this to extreme
   values (try to keep from 20 to 100).
 */
-#define SFG_FPS 60
+#ifndef SFG_FPS
+  #define SFG_FPS 60
+#endif
 
 /**
   On platforms with mouse this sets its horizontal sensitivity. 128 means 1
@@ -81,6 +83,14 @@
   #define SFG_RESOLUTION_SCALEDOWN 1
 #endif
 
+/**
+  Multiplier, in RCL_Units (1024 == 1.0), of the damager player takes. This can
+  be used to balance difficulty.
+*/
+#ifndef SFG_PLAYER_DAMAGE_MULTIPLIER
+  #define SFG_PLAYER_DAMAGE_MULTIPLIER 512
+#endif
+
 /**
   Hint as to whether run in fullscreen, if the platform allows it.
 */
@@ -301,14 +311,14 @@
   Developer cheat for having infinite ammo in all weapons.
 */
 #ifndef SFG_INFINITE_AMMO
-  #define SFG_INFINITE_AMMO 1
+  #define SFG_INFINITE_AMMO 0
 #endif
 
 /**
   Developer cheat for immortality.
 */
 #ifndef SFG_IMMORTAL
-  #define SFG_IMMORTAL 1
+  #define SFG_IMMORTAL 0
 #endif
 
 /**
@@ -330,14 +340,14 @@
   options is ignored, 1 means load level 1 etc.
 */
 #ifndef SFG_START_LEVEL
-  #define SFG_START_LEVEL 6
+  #define SFG_START_LEVEL 0
 #endif
 
 /**
   Reveals whole level map from start.
 */
 #ifndef SFG_REVEAL_MAP
-  #define SFG_REVEAL_MAP 1
+  #define SFG_REVEAL_MAP 0
 #endif
 
 /**