diff --git a/demo2.cpp b/demo2.cpp
index cab238e..09619a4 100644
--- a/demo2.cpp
+++ b/demo2.cpp
@@ -40,7 +40,7 @@ const unsigned char level[] =
   0,0,2,0,0,0,0,0,0,0,0,0,0,0,0,0,2,2,1,1,1,0,1,1,1,1,1,0,0,1,1,1, // 9
   0,0,1,1,1,0,0,0,0,0,0,0,0,0,0,3,3,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1, // 10
   0,0,0,0,3,0,0,0,0,0,0,0,0,0,3,3,0,0,0,0,0,0,0,1,0,0,0,0,0,3,0,1, // 11
-  1,3,1,0,1,1,1,1,1,1,2,0,2,2,3,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1, // 12
+  1,3,1,0,1,1,4,4,4,1,2,0,2,2,3,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1, // 12
   0,0,0,0,0,0,0,0,0,1,0,0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,3,0,1, // 13
   0,3,0,3,0,3,0,3,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1, // 14
   0,0,0,0,0,0,0,0,0,1,0,0,0,0,2,0,0,0,0,0,0,0,0,1,0,3,0,3,0,3,0,1  // 15
@@ -307,6 +307,93 @@ const unsigned char texture3[] =
   ,0x09,0x09,0x11,0x08
 };
 
+const unsigned char texture4[] =
+{  32, 36 // width, height
+  ,0x00,0x09,0x00,0x00,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0x51,0x09,0xbd,0xbd
+  ,0xbd,0xa3,0x09,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0x51,0x09
+  ,0xbd,0xbd,0xbd,0xa3,0x09,0x59,0x09,0x09,0x00,0x09,0x00,0x00,0xa3,0xa3
+  ,0xa3,0xa3,0xa3,0x51,0x09,0xbd,0xa3,0xa3,0xa3,0xa3,0xa3,0x09,0xa3,0xa3
+  ,0xa3,0xa3,0xa3,0xa3,0xa3,0x51,0x09,0xbd,0xa3,0xa3,0xa3,0xa3,0xa3,0x59
+  ,0x09,0x09,0x00,0x09,0x00,0x00,0xa3,0xa3,0xa3,0xa3,0xa3,0x51,0x09,0xbd
+  ,0xa3,0xa3,0xa3,0xa3,0xa3,0x09,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0x51
+  ,0x09,0xbd,0xa3,0xa3,0xa3,0xa3,0xa3,0x59,0x09,0x09,0x00,0x09,0x00,0x00
+  ,0xa3,0xa3,0xa3,0xa3,0x51,0x09,0xbd,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3
+  ,0x09,0xa3,0xa3,0xa3,0xa3,0xa3,0x51,0x09,0xbd,0xa3,0xa3,0xa3,0xa3,0xa3
+  ,0xa3,0x59,0x09,0x09,0x00,0x09,0x00,0x00,0x51,0x51,0x51,0x51,0x51,0x09
+  ,0xbd,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0x09,0xa3,0x51,0x51,0x51,0x51
+  ,0x51,0x09,0xbd,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0x59,0x09,0x09,0x00,0x08
+  ,0x00,0x00,0x09,0x09,0x09,0x09,0x09,0xbd,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3
+  ,0xa3,0xa3,0x51,0x09,0x09,0x09,0x09,0x09,0x09,0xbd,0xa3,0xa3,0xa3,0xa3
+  ,0xa3,0xa3,0xa3,0x59,0x09,0x09,0x00,0x09,0x00,0x00,0x73,0x73,0x73,0x73
+  ,0x21,0x09,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0x51,0x09,0x59,0x59,0x59
+  ,0x59,0x59,0x61,0x09,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0x59,0x09,0x09
+  ,0x00,0x08,0x00,0x00,0x21,0x21,0x21,0x21,0x21,0x09,0xa3,0xa3,0xa3,0xa3
+  ,0xa3,0xa3,0xa3,0x51,0x09,0x59,0x61,0x61,0x61,0x61,0x61,0x09,0xa3,0xa3
+  ,0xa3,0xa3,0xa3,0xa3,0xa3,0x59,0x09,0x09,0x00,0x09,0x00,0x00,0x21,0x21
+  ,0x21,0x21,0x21,0x21,0x09,0xa3,0xa3,0xa3,0xa3,0xa3,0x51,0x09,0x59,0x61
+  ,0x61,0x61,0x61,0x61,0x61,0x61,0x09,0xa3,0xa3,0xa3,0xa3,0xa3,0x51,0x11
+  ,0x09,0x09,0x00,0x09,0x00,0x00,0x21,0x21,0x21,0x21,0x21,0x21,0x09,0xa3
+  ,0x51,0x51,0x51,0x51,0x51,0x09,0x59,0x61,0x61,0x61,0x61,0x61,0x61,0x61
+  ,0x09,0xa3,0x51,0x51,0x51,0x51,0x51,0x59,0x09,0x09,0x00,0x09,0x00,0x00
+  ,0x21,0x21,0x21,0x21,0x21,0x21,0x19,0x09,0x09,0x09,0x09,0x09,0x09,0x59
+  ,0x61,0x61,0x61,0x61,0x61,0x61,0x61,0x61,0xa3,0x09,0x09,0x09,0x09,0x09
+  ,0x09,0x59,0x09,0x09,0x00,0x09,0x00,0x00,0x21,0x21,0x21,0x21,0x21,0x19
+  ,0x09,0xbd,0xbd,0xbd,0xbd,0xbd,0xa3,0x09,0x61,0x61,0x61,0x61,0x61,0x61
+  ,0x61,0x9b,0x09,0x59,0x59,0x59,0x59,0x59,0x61,0x59,0x09,0x09,0x00,0x09
+  ,0x00,0x00,0x21,0x21,0x21,0x21,0x19,0x09,0xbd,0xa3,0xa3,0xa3,0xa3,0xa3
+  ,0xa3,0x09,0x61,0x61,0x61,0x61,0x61,0x61,0x61,0x9b,0x59,0x61,0x61,0x61
+  ,0x61,0x61,0x61,0x59,0x09,0x09,0x00,0x09,0x00,0x00,0x21,0x21,0x21,0x21
+  ,0x19,0x09,0xbd,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0x09,0x61,0x61,0x61
+  ,0x61,0x61,0xa3,0x09,0x59,0x61,0x61,0x61,0x61,0x61,0x61,0x59,0x09,0x09
+  ,0x00,0x09,0x00,0x00,0x19,0x19,0x19,0x19,0x09,0xbd,0xa3,0xa3,0xa3,0xa3
+  ,0xa3,0xa3,0xa3,0xa3,0x09,0x61,0xa3,0xa3,0xa3,0xa3,0x09,0x59,0x61,0x61
+  ,0x61,0x61,0x61,0x61,0x61,0x59,0x09,0x09,0x00,0x09,0x00,0x00,0x09,0x09
+  ,0x09,0x09,0xbd,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0x09
+  ,0x09,0x09,0x09,0x09,0x59,0x61,0x61,0x61,0x61,0x61,0x61,0x61,0x61,0x59
+  ,0x09,0x09,0x00,0x09,0x00,0x00,0x59,0x59,0x59,0x61,0x09,0xa3,0xa3,0xa3
+  ,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0x51,0x09,0x59,0x59,0x59,0x61,0x09,0x61
+  ,0x61,0x61,0x61,0x61,0x61,0x61,0x61,0x59,0x09,0x09,0x00,0x09,0x00,0x00
+  ,0x61,0x61,0x61,0x61,0x61,0x09,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0x51
+  ,0x09,0x59,0x61,0x61,0x61,0x61,0x61,0x09,0x61,0x61,0x61,0x61,0x61,0x61
+  ,0x61,0x11,0x09,0x09,0x00,0x09,0x00,0x00,0x61,0x61,0x61,0x61,0x61,0x09
+  ,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0x51,0x09,0x59,0x61,0x61,0x61,0x61
+  ,0x61,0x09,0x61,0x61,0x61,0x61,0x61,0x61,0x61,0x59,0x09,0x09,0x00,0x09
+  ,0x00,0x00,0x61,0x61,0x61,0x61,0x61,0x61,0x09,0xa3,0xa3,0xa3,0xa3,0xa3
+  ,0x51,0x09,0x59,0x61,0x61,0x61,0x61,0x61,0x61,0x61,0x09,0x61,0x61,0x61
+  ,0x61,0x61,0xa3,0x59,0x09,0x09,0x00,0x08,0x00,0x00,0x61,0x61,0x61,0x61
+  ,0x61,0x61,0x09,0xa3,0x51,0x51,0x51,0x51,0x51,0x09,0x59,0x61,0x61,0x61
+  ,0x61,0x61,0x61,0x61,0x09,0x61,0xa3,0xa3,0xa3,0xa3,0xa3,0x59,0x09,0x09
+  ,0x00,0x09,0x00,0x00,0x61,0x61,0x61,0x61,0x61,0x61,0xa3,0x09,0x09,0x09
+  ,0x09,0x09,0x09,0x59,0x61,0x61,0x61,0x61,0x61,0x61,0x61,0x61,0xa3,0x09
+  ,0x09,0x09,0x09,0x09,0x09,0x59,0x09,0x09,0x00,0x08,0x00,0x00,0x61,0x61
+  ,0x61,0x61,0x61,0xa3,0x09,0xbd,0xbd,0xbd,0xbd,0xbd,0xa3,0x09,0x61,0x61
+  ,0x61,0x61,0x61,0x61,0x61,0xa3,0x09,0xbd,0xbd,0xbd,0xbd,0xbd,0xa3,0x59
+  ,0x09,0x09,0x00,0x09,0x00,0x00,0x61,0x61,0x61,0x61,0xa3,0x09,0xbd,0xa3
+  ,0xa3,0xa3,0xa3,0xa3,0xa3,0x09,0x61,0x61,0x61,0x61,0x61,0x61,0xa3,0x09
+  ,0xbd,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0x59,0x09,0x09,0x00,0x09,0x00,0x00
+  ,0xa3,0xa3,0xa3,0xa3,0xa3,0x09,0xbd,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3
+  ,0x09,0x61,0xa3,0xa3,0xa3,0xa3,0xa3,0x09,0xbd,0xa3,0xa3,0xa3,0xa3,0xa3
+  ,0xa3,0x59,0x09,0x09,0x00,0x09,0x00,0x00,0x09,0x09,0x09,0x09,0x09,0xbd
+  ,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0x51,0x09,0x09,0x09,0x09,0x09
+  ,0x09,0xbd,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0x59,0x09,0x09,0x00,0x09
+  ,0x00,0x00,0xbd,0xbd,0xbd,0xbd,0x09,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3
+  ,0xa3,0x51,0x09,0xbd,0xbd,0xbd,0xbd,0xa3,0x09,0xa3,0xa3,0xa3,0xa3,0xa3
+  ,0xa3,0xa3,0xa3,0x59,0x09,0x09,0x00,0x09,0x00,0x00,0xa3,0xa3,0xa3,0xa3
+  ,0xa3,0x09,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0x51,0x09,0xbd,0xa3,0xa3
+  ,0xa3,0xa3,0xa3,0x09,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0x59,0x09,0x09
+  ,0x00,0x09,0x00,0x00,0xa3,0xa3,0xa3,0xa3,0xa3,0x09,0xa3,0xa3,0xa3,0xa3
+  ,0xa3,0xa3,0x51,0x09,0xbd,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0x09,0xa3,0xa3
+  ,0xa3,0xa3,0xa3,0xa3,0x51,0x59,0x09,0x09,0x00,0x09,0x00,0x00,0xa3,0xa3
+  ,0xa3,0xa3,0xa3,0xa3,0x09,0xa3,0xa3,0xa3,0xa3,0xa3,0x51,0x09,0xbd,0xa3
+  ,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0x09,0xa3,0xa3,0xa3,0xa3,0xa3,0x51,0x59
+  ,0x09,0x09,0x00,0x09,0x00,0x00,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0x09,0xa3
+  ,0x51,0x51,0x51,0x51,0x09,0xbd,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3
+  ,0x09,0xa3,0x51,0x51,0x51,0x51,0x19,0x59,0x09,0x09,0x00,0x09,0x00,0x00
+  ,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0x09,0x09,0x09,0x09,0x09,0xbd,0xa3
+  ,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0xa3,0x09,0x09,0x09,0x09,0x09
+  ,0x09,0x59,0x09,0x09
+};
+
 const unsigned char sprite1[] =
 {  32, 32 // width, height
   ,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x00
@@ -463,7 +550,7 @@ const unsigned char sprite2[] =
   ,0x07,0x07
 };
 
-const unsigned char *textures[] = {texture1, texture2, texture3};
+const unsigned char *textures[] = {texture1, texture2, texture3, texture4};
 
 Unit floorHeightAt(int16_t x, int16_t y)
 {
diff --git a/general.hpp b/general.hpp
index 2aed030..df63115 100644
--- a/general.hpp
+++ b/general.hpp
@@ -126,7 +126,7 @@ inline uint8_t sampleImage(const unsigned char *image, Unit x, Unit y)
   y = wrap(y,UNITS_PER_SQUARE);
 
   int32_t index =
-    image[1] * ((image[1] * x) / UNITS_PER_SQUARE) + (image[0] * y) /
+    image[1] * ((image[0] * x) / UNITS_PER_SQUARE) + (image[0] * y) /
     UNITS_PER_SQUARE;
 
   return image[2 + index];