Maps are more generic as well as cells.

ConsoleApp/Maps/SquareCell.cs

@@ -4,11 +4,13 @@ namespace ConsoleApp.Maps
     {
         public int X { get; }
         public int Y { get; }
+        public int Z { get; }
 
         public SquareCell(int x, int y)
         {
             X = x;
             Y = y;
+            Z = default;
         }
     }
 }