diff --git a/Assets/Scripts/Interface/IMaze.cs b/Assets/Scripts/Interface/IMaze.cs
index fd6fdcb..bdeafce 100644
--- a/Assets/Scripts/Interface/IMaze.cs
+++ b/Assets/Scripts/Interface/IMaze.cs
@@ -1,14 +1,11 @@
-using System.Collections;
-using System.Collections.Generic;
-
-namespace MazeProject {
-  /*
-   * CellType enum is used to indicate the content of the cell
-   */
-  public enum CellType {
+namespace MazeProject
+{
+    /*
+     * CellType enum is used to indicate the content of the cell
+     */
+    public enum CellType {
     CELL_IS_EMPTY,
     CELL_IS_WALL,
-    CELL_TRAVERSED  // used for marking cell for path-finding algorithms
   }
 
   /*
@@ -23,17 +20,18 @@ public interface IMaze {
 
     // returns the content of the cell[row][col]
     CellType GetCellType(int row, int col);
-    
+
     // returns the number of rows the maze was initialized to
     int GetNumRows();
-    
+
     // returns the number of columns the maze was initialized to
-    int GetNumColumns();
-    
-    // set the weight of a cell (used for path-finding algorithms)
-    void SetWeight(int row, int col, int weight);
+    int GetNumColumns();    
+
+    // Associate a metadata attribute with a given maze cell
+    void SetMetadata(int row, int col, string attribute, object data);
 
-    // retrieve weight of specified cell
-    int GetWeight(int row, int col);
+    // Retrieve the metadata attribute associated with a given cell,
+    // or null if no such attribute was previously associated.
+    object GetMetadata(int row, int col, string attribute);
   }
 }