Hi mudge002! I thought I had responded to this thread earlier, but must have missed hitting "Send". It's very possible to do what you wish. After you have turned on Explorable Darkness, click on the Dynamic Lighting tool, and choose Explorable Darkness. You can then click the reveal button and draw a rectangle to expose whatever portion of the map you wish. If you think yo've revealed too much, you can repeat with the conceal button, or just click the reset button and start over. You can also choose the polygon tool if you want to reveal an irregular area.