Defend the Diamond

You are the only guard on duty protecting the museum's most prized possession, the 10 lb diamond. It is your job to protect the diamond from thieves trying to get to it. 

Use the O key to place walls, and the P key to place nets to capture the thieves. Click the key once to make the object appear to move around, and again to lock in and spawn the next one to move around. You can also restart a level using the R key. Once you place almost all of your items the thieves will spawn on the checkered squares. You can not place anything on red squares.

Each net is one use, so use them wisely. If the thieves don't get captured within 30 seconds, you have to restart the round.