diff --git a/TODO.txt b/TODO.txt
index d9065d2..5c487fe 100644
--- a/TODO.txt
+++ b/TODO.txt
@@ -20,6 +20,7 @@
 - add jump pads?
 - add robot deactivator item? (encourages "stealth" gameplay)
 - add "pletivo" transparent wall texture?
+- add universal corpse sprite?
 
 bugs:
 
diff --git a/assets/item_card.png b/assets/item_card.png
new file mode 100644
index 0000000..c71954b
Binary files /dev/null and b/assets/item_card.png differ
diff --git a/images.h b/images.h
index f9db0bc..e95990b 100644
--- a/images.h
+++ b/images.h
@@ -510,6 +510,26 @@ SFG_PROGRAM_MEMORY uint8_t SFG_itemSprites[][SFG_TEXTURE_STORE_SIZE] =
 0,1,17,17,34,130,36,0,0,0,0,30,229,167,16,0,0,0,0,1,36,130,36,0,0,0,0,30,90,125,
 16,0,0,0,0,0,17,22,36,0,0,0,0,1,167,209,0,0,0,0,0,0,0,1,17,0,0,0,0,0,17,16,0,0,
 0,0,0,0,0,0,0
+  },
+  { // 6, access card
+175,0,21,45,44,23,46,2,19,34,69,22,68,60,131,8,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,17,17,17,17,17,17,17,0,0,0,0,0,0,0,0,1,
+68,17,24,102,101,86,97,0,0,0,0,0,0,0,0,1,68,17,24,102,85,86,101,16,0,0,0,0,0,0,
+0,1,67,17,24,101,85,86,101,183,16,0,0,0,0,0,0,1,51,17,24,85,85,102,59,178,16,0,
+0,0,0,0,0,1,51,17,24,85,86,232,219,34,240,0,0,0,0,0,0,1,51,17,24,85,86,131,130,
+34,240,0,0,0,0,0,0,1,51,17,24,85,102,52,114,34,16,0,0,0,0,0,0,1,54,17,24,86,99,
+56,66,34,16,0,0,0,0,0,0,1,102,17,24,86,51,141,114,34,16,0,0,0,0,0,0,1,101,17,24,
+102,51,211,114,34,16,0,0,0,0,0,0,1,101,17,24,99,51,55,114,34,16,0,0,0,0,0,0,1,
+85,17,24,51,51,119,226,34,16,0,0,0,0,0,0,1,85,17,24,51,52,71,34,34,16,0,0,0,0,0,
+0,1,85,17,24,51,52,119,130,34,16,0,0,0,0,0,0,1,85,17,24,51,68,228,114,34,16,0,0,
+0,0,0,0,1,85,17,24,52,68,66,34,34,16,0,0,0,0,0,0,1,86,17,25,52,68,66,34,34,16,0,
+0,0,0,0,0,1,86,17,23,68,68,34,34,34,16,0,0,0,0,0,0,1,102,17,23,68,68,34,34,34,
+16,0,0,0,0,0,0,1,99,17,23,68,153,153,114,34,16,0,0,0,0,0,0,1,99,17,23,68,154,
+170,114,34,16,0,0,0,0,0,0,1,51,17,23,68,154,204,114,34,16,0,0,0,0,0,0,1,51,17,
+23,68,154,204,114,34,16,0,0,0,0,0,0,1,51,17,23,68,151,119,114,34,16,0,0,0,0,0,0,
+1,51,17,23,66,130,34,130,34,16,0,0,0,0,0,0,1,51,17,23,66,130,34,130,34,16,0,0,0,
+0,0,0,0,17,17,17,17,17,17,17,17,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0
   }
 };
 
diff --git a/levels.h b/levels.h
index d8d63da..ab38249 100644
--- a/levels.h
+++ b/levels.h
@@ -93,6 +93,9 @@ typedef struct
 #define SFG_LEVEL_ELEMENT_ROCKETS 0x04
 #define SFG_LEVEL_ELEMENT_PLASMA 0x05
 #define SFG_LEVEL_ELEMENT_TREE 0x06
+#define SFG_LEVEL_ELEMENT_CARD0 0x07
+#define SFG_LEVEL_ELEMENT_CARD1 0x08
+#define SFG_LEVEL_ELEMENT_CARD2 0x09
 
 /* 
   Monsters have lower 4 bits zero and are only distinguished by the 4 upper
@@ -281,8 +284,8 @@ SFG_PROGRAM_MEMORY SFG_Level SFG_level0 =
     {SFG_LEVEL_ELEMENT_PLASMA, {3, 57}},     {SFG_LEVEL_ELEMENT_PLASMA, {3, 58}},
     {SFG_LEVEL_ELEMENT_TREE, {16, 44}},     {SFG_LEVEL_ELEMENT_TREE, {16, 45}},
     {SFG_LEVEL_ELEMENT_TREE, {16, 46}},     {SFG_LEVEL_ELEMENT_NONE, {0, 0}},
-    {SFG_LEVEL_ELEMENT_NONE, {0, 0}},     {SFG_LEVEL_ELEMENT_NONE, {0, 0}},
-    {SFG_LEVEL_ELEMENT_NONE, {0, 0}},     {SFG_LEVEL_ELEMENT_NONE, {0, 0}},
+    {SFG_LEVEL_ELEMENT_CARD0, {13, 20}},     {SFG_LEVEL_ELEMENT_CARD1, {14, 20}},
+    {SFG_LEVEL_ELEMENT_CARD2, {13, 21}},     {SFG_LEVEL_ELEMENT_NONE, {0, 0}},
     {SFG_LEVEL_ELEMENT_NONE, {0, 0}},     {SFG_LEVEL_ELEMENT_NONE, {0, 0}},
     {SFG_LEVEL_ELEMENT_NONE, {0, 0}},     {SFG_LEVEL_ELEMENT_NONE, {0, 0}},
     {SFG_LEVEL_ELEMENT_NONE, {0, 0}},     {SFG_LEVEL_ELEMENT_NONE, {0, 0}},
diff --git a/main.c b/main.c
index 1e28a0d..f852b61 100755
--- a/main.c
+++ b/main.c
@@ -122,7 +122,7 @@ void SFG_init();
 #define RCL_TEXTURE_VERTICAL_STRETCH 0
 
 #define RCL_CAMERA_COLL_HEIGHT_BELOW 800
-#define RCL_CAMERA_COLL_HEIGHT_ABOVE 150
+#define RCL_CAMERA_COLL_HEIGHT_ABOVE 200
 
 #include "raycastlib.h" 
 
@@ -248,6 +248,8 @@ struct
   uint8_t  freeLook;             /**< If on, the vertical looking (shear) does
                                  not automatically shear back. This is mainly 
                                  for mouse control. */
+  uint8_t  cards;                /**< Lowest bits say which access cards have
+                                 been taken. */
 } SFG_player;
 
 uint8_t SFG_explosionSoundPlayed;  /**< Prevents playing too many explosion
@@ -975,6 +977,8 @@ void SFG_initPlayer()
 
   SFG_player.health = SFG_PLAYER_MAX_HEALTH;
 
+  SFG_player.cards = 0;
+
   for (uint8_t i = 0; i < SFG_AMMO_TOTAL; ++i)
     SFG_player.ammo[i] = 0;
 }
@@ -1782,6 +1786,12 @@ static inline uint8_t SFG_elementCollides(
     <= SFG_ELEMENT_COLLISION_DISTANCE;
 }
 
+uint8_t SFG_getLevelElementSpriteIndex(uint8_t elementType)
+{
+  return ((elementType < SFG_LEVEL_ELEMENT_CARD0)
+    ? elementType : SFG_LEVEL_ELEMENT_CARD0) - 1;
+}
+
 /**
   Performs one game step (logic, physics), happening SFG_MS_PER_FRAME after
   previous frame. 
@@ -2207,6 +2217,12 @@ void SFG_gameStep()
             SFG_player.ammo[SFG_AMMO_PLASMA] += SFG_AMMO_INCREASE_PLASMA;
             break;
 
+          case SFG_LEVEL_ELEMENT_CARD0:
+          case SFG_LEVEL_ELEMENT_CARD1:
+          case SFG_LEVEL_ELEMENT_CARD2:
+            SFG_player.cards |= 1 << (e->type - SFG_LEVEL_ELEMENT_CARD0);
+            break;
+
           default:
             eliminate = 0;
             break;
@@ -2449,6 +2465,7 @@ void SFG_gameStep()
         SFG_currentLevel.checkedDoorIndex = 0;
     }
 
+    // move door up/down:
     for (uint32_t i = 0; i < SFG_currentLevel.doorRecordCount; ++i)
     {
       SFG_DoorRecord *door = &(SFG_currentLevel.doorRecords[i]);
@@ -2948,7 +2965,8 @@ void SFG_draw()
 
         if (p.depth > 0)
         {
-          SFG_drawScaledSprite(SFG_itemSprites[e.type - 1],
+          SFG_drawScaledSprite(
+            SFG_itemSprites[SFG_getLevelElementSpriteIndex(e.type)],
             p.position.x * SFG_RAYCASTING_SUBSAMPLE,p.position.y,
             RCL_perspectiveScale(SFG_SPRITE_SIZE(size),p.depth),
             p.depth / (RCL_UNITS_PER_SQUARE * 2),p.depth - 1000);
@@ -3024,11 +3042,13 @@ void SFG_draw()
       color = 2;
     }
 
+    #define TEXT_Y (SFG_GAME_RESOLUTION_Y - SFG_HUD_MARGIN - \
+      SFG_FONT_CHARACTER_SIZE * SFG_FONT_SIZE_MEDIUM)
+
     SFG_drawNumber( // health
       SFG_player.health,
       SFG_HUD_MARGIN,
-      SFG_GAME_RESOLUTION_Y - SFG_HUD_MARGIN - 
-        SFG_FONT_CHARACTER_SIZE * SFG_FONT_SIZE_MEDIUM,
+      TEXT_Y,
       SFG_FONT_SIZE_MEDIUM,
       SFG_player.health > SFG_PLAYER_HEALTH_WARNING_LEVEL ? 4 : 175);
 
@@ -3036,10 +3056,17 @@ void SFG_draw()
       SFG_player.ammo[SFG_weaponAmmo(SFG_player.weapon)],
       SFG_GAME_RESOLUTION_X - SFG_HUD_MARGIN -
         SFG_FONT_CHARACTER_SIZE * SFG_FONT_SIZE_MEDIUM * 3,
-      SFG_GAME_RESOLUTION_Y - SFG_HUD_MARGIN - 
-        SFG_FONT_CHARACTER_SIZE * SFG_FONT_SIZE_MEDIUM,
+      TEXT_Y,
       SFG_FONT_SIZE_MEDIUM,
-      4);
+      4); 
+
+    for (uint8_t i = 0; i < 3; ++i) // access cards
+      if (SFG_player.cards & (1 << i))
+        SFG_drawText(",",SFG_HUD_MARGIN + SFG_FONT_CHARACTER_SIZE *
+        SFG_FONT_SIZE_MEDIUM * (6 + i),
+        TEXT_Y,SFG_FONT_SIZE_MEDIUM,i == 0 ? 93 : (i == 1 ? 124 : 60));
+
+    #undef TEXT_Y
 
     // border indicator
 
diff --git a/raycastlib.h b/raycastlib.h
index 033efc2..6e24a52 100644
--- a/raycastlib.h
+++ b/raycastlib.h
@@ -26,7 +26,7 @@
 
   author: Miloslav "drummyfish" Ciz
   license: CC0 1.0
-  version: 0.901
+  version: 0.902
 */
 
 #include <stdint.h>
@@ -1680,8 +1680,7 @@ RCL_PixelInfo RCL_mapToScreen(RCL_Vector2D worldPosition, RCL_Unit height,
     middleColumn + (-1 * toPoint.y * middleColumn) / RCL_nonZero(result.depth);
 
   result.position.y = camera.resolution.y / 2 -
-(((3 * camera.resolution.y) / 4 ) *
-//    ((camera.resolution.y / 2) *
+     (((3 * camera.resolution.y) / 4 ) *
      RCL_perspectiveScale(height - camera.height,result.depth))
      / RCL_UNITS_PER_SQUARE + camera.shear;
 
@@ -1760,8 +1759,9 @@ void RCL_moveCameraWithCollision(RCL_Camera *camera, RCL_Vector2D planeOffset,
         dir##Collides = 1;\
       else if (ceilingHeightFunc != 0)\
       {\
-        height = ceilingHeightFunc(s1,s2);\
-        if (height < topLimit)\
+        RCL_Unit height2 = ceilingHeightFunc(s1,s2);\
+        if ((height2 < topLimit) || ((height2 - height) < \
+          (RCL_CAMERA_COLL_HEIGHT_ABOVE + RCL_CAMERA_COLL_HEIGHT_BELOW)))\
           dir##Collides = 1;\
       }\
     }\