diff --git a/src/cells.c b/src/cells.c
index f79b29a..afde208 100644
--- a/src/cells.c
+++ b/src/cells.c
@@ -52,6 +52,9 @@ void drawGrid(int grid[CELL_AMOUNT][CELL_AMOUNT])
                 case WATER:
                     DrawRectangle(CELL_SIZE_PIXELS*j, CELL_SIZE_PIXELS*i, CELL_SIZE_PIXELS, CELL_SIZE_PIXELS, BLUE);
                     break;
+                case VIRUS:
+                    DrawRectangle(CELL_SIZE_PIXELS*j, CELL_SIZE_PIXELS*i, CELL_SIZE_PIXELS, CELL_SIZE_PIXELS, VIOLET);
+                    break;
                 default:
                     break;
             }
@@ -125,6 +128,24 @@ void updateGrid(int grid[CELL_AMOUNT][CELL_AMOUNT]) {
                         }
                     }
                     break;
+                case VIRUS: /* It should not be too powerful. */
+                    if (i + 1 < CELL_AMOUNT && grid[i+1][j] != VOID && grid[i+1][j] != VIRUS) {
+                        int propagate = rand() % 10 == 0 ? 1 : 0;
+                        if (propagate) grid[i+1][j] = VIRUS;
+                    }
+                    else if (i - 1 >= 0 && grid[i-1][j] != VOID && grid[i-1][j] != VIRUS) {
+                        int propagate = rand() % 10 == 0 ? 1 : 0;
+                        if (propagate) grid[i-1][j] = VIRUS;
+                    }
+                    else if (j+1 < CELL_AMOUNT && grid[i][j+1] != VOID && grid[i][j+1] != VIRUS) {
+                        int propagate = rand() % 10 == 0 ? 1 : 0;
+                        if (propagate) grid[i][j+1] = VIRUS;
+                    }
+                    else if (j-1 >= 0 && grid[i][j-1] != VOID && grid[i][j-1] != VIRUS) {
+                        int propagate = rand() % 10 == 0 ? 1 : 0;
+                        if (propagate) grid[i][j-1] = VIRUS;
+                    }
+                    break;
                 default:
                     break;
             }
diff --git a/src/cells.h b/src/cells.h
index fd65401..2eb863f 100644
--- a/src/cells.h
+++ b/src/cells.h
@@ -53,6 +53,7 @@ typedef enum CellType
     SAND,
     STONE,
     WATER,
+    VIRUS,
     CELL_TYPE_MAX
 } CellType;
 
diff --git a/src/utils.c b/src/utils.c
index 012d38a..b1233bd 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -56,6 +56,7 @@ char* enumToString(CellType brush)
         case SAND:  return "Sand";
         case STONE: return "Stone";
         case WATER: return "Water";
+        case VIRUS: return "Virus";
         default:    return "Unknown";
     }
 }