These arrows are very useful to see areas hidden by high buildings. Wangbomi's Face icon in the upper right corner can turn on or off the Wangbomi animation. In the beginning the mouse cursor has a regular shape. But when the gamer selects a construction tool, the cursor shape changes according to the selected tool. After selecting a tool, diamonds of various colors appear and indicate the zones in which the selected construction tool may be used.
Diamonds change depending on the size of buildings.
For example, when a police station is selected, the cursor changes to the shape of a siren, and the size of the diamond is 2x2. Locate the cursor in the desired zone and click the left mouse button to build a building. However, if the diamond's color is red, a gamer cannot build a building in that zone. So be careful. Hold the left mouse button down and drag to build roads and railroads.