diff --git a/C++/Doom Fire Algorithm/main.cpp b/C++/Doom Fire Algorithm/main.cpp
index e78bf51..8d968a5 100644
--- a/C++/Doom Fire Algorithm/main.cpp	
+++ b/C++/Doom Fire Algorithm/main.cpp	
@@ -3,24 +3,23 @@
 #define OLC_PGE_APPLICATION
 #include "olcPixelGameEngine.h"
 
-int WINDOW_HEIGHT = 720;
-int WINDOW_WIDTH = 1280;
+int WINDOW_HEIGHT = 720 / 4;
+int WINDOW_WIDTH = 1280 / 4;
 
-int fireSize = 4;
-int* firePixelsArray = new int[(WINDOW_WIDTH / fireSize) * (WINDOW_HEIGHT / fireSize)];
-int numberOfPixels = (WINDOW_WIDTH / fireSize) * (WINDOW_HEIGHT / fireSize); 
+int* firePixelsArray = new int[(WINDOW_WIDTH) * (WINDOW_HEIGHT)];
+int numberOfPixels = (WINDOW_WIDTH) * (WINDOW_HEIGHT); 
 
 int fireColoursPalette[37][3] = {{7, 7, 7}, {31, 7, 7}, {47, 15, 7}, {71, 15, 7}, {87, 23, 7}, {103, 31, 7}, {119, 31, 7}, {143, 39, 7}, {159, 47, 7}, {175, 63, 7}, {191, 71, 7}, {199, 71, 7}, {223, 79, 7}, {223, 87, 7}, {223, 87, 7}, {215, 95, 7}, {215, 95, 7}, {215, 103, 15}, {207, 111, 15}, {207, 119, 15}, {207, 127, 15}, {207, 135, 23}, {199, 135, 23}, {199, 143, 23}, {199, 151, 31}, {191, 159, 31}, {191, 159, 31}, {191, 167, 39}, {191, 167, 39}, {191, 175, 47}, {183, 175, 47}, {183, 183, 47}, {183, 183, 55}, {207, 207, 111}, {223, 223, 159}, {239, 239, 199}, {255, 255, 255}};
 
 class FireSim : public olc::PixelGameEngine {
 public:
     FireSim() {
-        sAppName = "Doom Fire Simulator";
+        sAppName = "Doom Fire Simulator";   
     }
 
     bool OnUserCreate() override {
         for (int i = 0; i < numberOfPixels; i++) {
-            firePixelsArray[i] = 20;
+            firePixelsArray[i] = 36;
         }
         return true;
     };
@@ -38,18 +37,36 @@ public:
 
         if (GetMouse(0).bHeld) {
             Vec2<int> m = {GetMouseX(), GetMouseY()};
-            int index =  (m.y * WINDOW_WIDTH + m.x) / fireSize;
-            if (index >= numberOfPixels) {
-                return true;
-            }
-            firePixelsArray[index] = 36;
+            auto fillCircle = [&](int x, int y, int radius, int val) {
+                // Taken from wikipedia
+                int x0 = 0;
+                int y0 = radius;
+                int d = 3 - 2 * radius;
+                if (!radius) return;
+
+                auto drawline = [&](int sx, int ex, int ny) {
+                    for (int i = sx; i <= ex; i++)
+                        firePixelsArray[ny * WINDOW_WIDTH + i] = val;
+                };
+
+                while (y0 >= x0) {
+                    // Modified to draw scan-lines instead of edges
+                    drawline(x - x0, x + x0, y - y0);
+                    drawline(x - y0, x + y0, y - x0);
+                    drawline(x - x0, x + x0, y + y0);
+                    drawline(x - y0, x + y0, y + x0);
+                    if (d < 0) d += 4 * x0++ + 6;
+                    else d += 4 * (x0++ - y0--) + 10;
+                }
+            };
+            fillCircle(m.x, m.y, 4, 36);
         }
 
         return true;
     }
 
     void UpdateFireIntensity(int pixel) {
-        int pixelBelowIndex = pixel + (WINDOW_WIDTH / fireSize);
+        int pixelBelowIndex = pixel + WINDOW_WIDTH;
         if (pixelBelowIndex < numberOfPixels) {
             int decay = floor(rand() % 3);
             int pixelBelowIntensity = firePixelsArray[pixelBelowIndex];
@@ -61,16 +78,15 @@ public:
 
     void Render() {
         Clear(olc::BLACK);
-        for (int x = 0; x < WINDOW_WIDTH; x += fireSize) {
-            for (int y = 0; y < WINDOW_HEIGHT; y += fireSize) {
-                int pixel = x + ((WINDOW_WIDTH / fireSize) * y);
-                int pixelI = pixel / fireSize;
-                int fireIntensity = firePixelsArray[pixelI];
+        for (int x = 0; x < WINDOW_WIDTH; x++) {
+            for (int y = 0; y < WINDOW_HEIGHT; y++) {
+                int pixel = x + (WINDOW_WIDTH * y);
+                int fireIntensity = firePixelsArray[pixel];
                 uint8_t r = fireColoursPalette[fireIntensity][0];
                 uint8_t g = fireColoursPalette[fireIntensity][1];
                 uint8_t b = fireColoursPalette[fireIntensity][2];
                 olc::Pixel col = {r, g, b, 255};
-                FillRect(x, y, fireSize, fireSize, col);
+                FillRect(x, y, 1, 1, col);
             }
         }
     }
@@ -85,7 +101,7 @@ private:
 
 int main(int argc, char** argv) {
     FireSim app;
-    if (app.Construct(WINDOW_WIDTH, WINDOW_HEIGHT, 1, 1))
+    if (app.Construct(WINDOW_WIDTH, WINDOW_HEIGHT, 4, 4))
         app.Start();
     return 0;
 }
diff --git a/C++/Doom Fire Algorithm/output.exe b/C++/Doom Fire Algorithm/output.exe
index e0e166c..8585616 100644
Binary files a/C++/Doom Fire Algorithm/output.exe and b/C++/Doom Fire Algorithm/output.exe differ